CN116315141A - Winding type high-rate sodium ion winding core, battery and preparation method - Google Patents
Winding type high-rate sodium ion winding core, battery and preparation method Download PDFInfo
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- CN116315141A CN116315141A CN202310237523.7A CN202310237523A CN116315141A CN 116315141 A CN116315141 A CN 116315141A CN 202310237523 A CN202310237523 A CN 202310237523A CN 116315141 A CN116315141 A CN 116315141A
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
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- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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Abstract
The invention provides a winding type high-rate sodium ion winding core, a battery and a preparation method thereof, wherein the preparation method of the winding core comprises the steps of preparing the winding core by centering and overlapping a positive plate, a negative plate and a diaphragm in a winding mode; wherein the main material of the positive plate is lamellar oxide, and the mass percentage of the lamellar oxide is in the range of 94.5-95.5%; the main material of the negative plate is hard carbon active material, and the mass percentage of the hard carbon active material is 92.7% -93.7%. Compared with the production of lithium ion batteries, the production cost of sodium ion batteries is low, the electrochemical performance of the sodium ion batteries and the production cost of the sodium ion batteries are excellent, the conductivity is high, and the processing process of raw materials is simple.
Description
Technical Field
The invention belongs to the technical field of sodium ion battery manufacturing, and particularly relates to a winding type high-rate sodium ion winding core, a battery and a preparation method.
Background
With the progress of the age, the demand of energy storage equipment is continuously increased, and a high-rate lithium ion battery becomes a preferred battery of small-power and small-energy storage equipment. However, in recent years, with the continuous rise of lithium ion battery materials, the manufacturing cost of lithium ion batteries is also increasing, and the high price makes many small and medium-sized enterprises unable to survive, so that most enterprises now shift to research on sodium ion batteries with better cost performance.
The cost of the lithium ion battery is mainly that the positive electrode main material and the negative electrode current collector copper foil; the lithium element is less in storage in the nature, the rare earth is noble, sodium ions and lithium ions belong to the same main group element, and the working principle of the sodium ion battery is similar to that of the lithium ion battery, so that the sodium ions are utilized to realize charge and discharge in the process of inserting and extracting between the positive electrode and the negative electrode. And the sodium ion battery production equipment is basically the same as lithium ions, and the production equipment does not need to be replaced. It is therefore necessary to develop high-rate sodium ion batteries of equivalent performance to replace lithium ion batteries.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a winding type high-rate sodium ion winding core, a battery and a preparation method, and aims to solve the problem of high manufacturing cost of a lithium ion battery in the prior art.
The embodiment of the invention provides a preparation method of a winding type high-rate sodium ion winding core, which comprises the following steps:
the positive plate, the negative plate and the diaphragm are overlapped in the middle to prepare a winding core in a winding mode;
wherein the main material of the positive plate is lamellar oxide, and the mass percentage of the lamellar oxide is in the range of 94.5-95.5%;
and/or the main material of the negative plate is hard carbon active material, and the mass percentage of the hard carbon active material is 92.7% -93.7%.
In one embodiment, the preparation method of the positive plate comprises the following steps:
mixing, stirring and dispersing a layered active oxide, a carbon nano tube conductive agent, a SUPER P conductive agent and a binder polyvinylidene fluoride PVDF by taking N-methyl pyrrolidone as a solvent to prepare anode slurry;
coating the positive electrode slurry on the surface of a positive electrode aluminum foil current collector;
drying and rolling the coated anode aluminum foil current collector;
wherein, the mass percent of the carbon nano tube conductive agent is in the range of 0.5-1.5%;
the mass percentage of the binder polyvinylidene fluoride PVDF is in the range of 2.0-3.0%;
the SUPER P conductive agent accounts for 1.0 to 2.4 percent by mass.
The double-sided density of the surface of the positive aluminum foil current collector is in the range of 260 g/square meter to 300 g/square meter.
In one embodiment, the double-sided density of the surface of the positive aluminum foil current collector is 280 g/square meter.
Or the double-sided density of the surface of the positive aluminum foil current collector is 295 g/square meter.
In one embodiment of the present invention,
the mass percentage of the lamellar active oxide is 94.8%;
the mass percentage of the carbon nano tube conductive agent is 1.0%;
the SUPER P conductive agent is 1.7% by mass;
The polyvinylidene fluoride PVDF as the agent is 2.5% in mass percentage.
Or, the mass percentage of the lamellar active oxide is 94.5%;
the mass percentage of the carbon nano tube conductive agent is 1.0%;
the SUPER P conductive agent is 1.7% by mass;
the polyvinylidene fluoride PVDF as the agent is 2.8% in mass percentage.
In one embodiment of the present invention,
the preparation method of the negative plate comprises the following steps:
deionized water is used as a solvent, and hard carbon active substances, SUPER P conductive agents and sodium polyacrylate PAA binder are mixed, stirred and dispersed to prepare negative electrode slurry;
coating the negative electrode slurry on the surface of a negative electrode aluminum foil current collector;
drying and rolling the coated anode aluminum foil current collector;
wherein the SUPER P conductive agent accounts for 2.3 to 3.3 percent of the total mass of the conductive agent;
the mass percentage of the adhesive sodium polyacrylate PAA is within the range of 3.5-4.5%;
the density of the aluminum foil current collector coated on the surface of the negative electrode is 160-170 g/square meter.
In one embodiment, the density of the coating on the surface of the negative aluminum foil current collector is 165 g/square meter;
or the density of the aluminum foil current collector coated on the surface of the negative electrode is 170 g/square meter.
In one embodiment of the present invention,
The hard carbon active material accounts for 93.2%;
the SUPER P conductive agent accounts for 2.8%;
the sodium polyacrylate PAA accounts for 4.0%.
Or, the hard carbon active material is 93.5%;
the SUPER P conductive agent accounts for 3.0%;
the sodium polyacrylate PAA accounts for 3.5%.
According to the winding type high-rate sodium ion winding core and the preparation method thereof, the winding type high-rate sodium ion winding core is prepared, and the 10C discharge capacity of the winding type high-rate sodium ion winding core is more than 80%.
A preparation method of a winding type high-rate sodium ion battery comprises the winding type high-rate sodium ion winding core; and (3) carrying out the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division on the winding type high-magnification sodium ion winding core.
According to the preparation method of the wound high-rate sodium ion battery, the wound high-rate sodium ion battery is prepared, and the 10C discharge capacity of the battery is more than 80%.
The winding type high-rate sodium ion winding core, the battery and the preparation method provided by the embodiment of the invention have the following beneficial effects:
on one hand, compared with the production of lithium ion batteries, the cost for producing sodium ion batteries is low, the mass percentage of the positive electrode main material of the sodium batteries is 94.5-95.5% of layered oxide, the mass percentage of the negative electrode main material of the sodium batteries is 92.7-93.7% of hard carbon, the electrochemical performance of the positive electrode main material and the negative electrode main material is excellent, the conductivity is higher, and the raw material processing process is simple.
On the other hand, the density of the coating surfaces of the positive plate and the negative plate is relatively small, so that the ions can be quickly moved back and forth between the ions, and the ions can be quickly embedded or separated when the battery is discharged at a high multiplying power.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing the percentage of discharge capacity of a battery obtained by the ninth configuration of the present invention;
FIG. 2 is a graph showing the percentage of discharge capacity of a battery obtained by a tenth configuration of the present invention;
FIG. 3 is a graph showing the percentage of discharge capacity of a battery obtained by the eleventh configuration of the present invention;
FIG. 4 is a graph of a battery 1C rate cycle in accordance with an embodiment nine of the present invention;
FIG. 5 is a graph showing a cycle of 1C rate for a battery according to an embodiment ten of the present invention;
fig. 6 is a cycle chart of the 1C rate of the battery in the eleventh embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present invention, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The embodiment of the invention provides a preparation method of a winding type high-rate sodium ion winding core, which comprises the following steps:
the positive plate, the negative plate and the diaphragm are overlapped in the middle to prepare a winding core in a winding mode;
wherein the main material of the positive plate is lamellar oxide, and the mass percentage of the lamellar oxide is in the range of 94.5-95.5%;
the main material of the negative plate is hard carbon active material, and the mass percentage of the hard carbon active material is 92.7% -93.7%.
The preparation of the winding core is particularly important in the preparation of sodium ion batteries, since the winding core determines the performance and safety of the sodium ion battery. Therefore, the preparation of the positive plate and the preparation of the negative plate lead to the need of selecting proper positive electrode active materials, and the materials are combined together with the charging reaction of the positive electrode materials to form a positive electrode compound. Similarly, the negative electrode sheet also needs to be selected from a suitable active material to be combined with the negative electrode material to form a negative electrode composite.
The positive electrode material and the negative electrode material in the sodium ion battery are aluminum foil current collectors. The positive electrode active material of the positive electrode plate adopts layered oxide, the negative electrode active material of the negative electrode plate adopts hard carbon active material, the electrochemical performance of the active material and the active material are excellent, the conductivity is higher, and the processing process of raw materials is simple. And the mass percentage of the layered oxide is in the range of 94.5% to 95.5% in order that the layered oxide is more fully reacted to free active sodium ion redox sodium salt. The mass percentage of the hard carbon active material is in the range of 92.7-93.7, and is limited by an interface passivation layer (called solid electrolyte interface SEI) of the positive plate ， As well as irreversible capacity loss and SEI solubility, the mass percentages of hard carbon actives described above are selected to achieve a stabilizing SEI, thereby improving cycle life.
Further, one side of the positive plate placed in the middle is contacted with one side of the diaphragm, one side of the negative plate is contacted with the other side of the diaphragm, so that the positive plate and the negative plate are stacked, the stacked positive plate and negative plate are wound, and the winding mode comprises one or more preparation modes of a manual winding mode, a semi-automatic winding mode and a full-automatic winding mode. That is, the winding core may be wound in actual steps according to the equipment on the actual production line. When manual winding is needed in the equipment, the stacked positive electrode sheet and the stacked negative electrode sheet can be wound in a manual winding mode; by analogy, the winding of the winding cores can be performed in a semiautomatic winding manner, in a fully automatic winding manner, even when the device requires two or more simultaneously.
In one embodiment, the preparation method of the positive plate comprises the following steps:
mixing, stirring and dispersing a layered active oxide, a carbon nano tube conductive agent, a SUPER P conductive agent and a binder polyvinylidene fluoride PVDF by taking N-methyl pyrrolidone as a solvent to prepare anode slurry;
Coating the positive electrode slurry on the surface of a positive electrode aluminum foil current collector;
drying and rolling the coated anode aluminum foil current collector;
wherein, the mass percent of the carbon nano tube conductive agent is in the range of 0.5-1.5%;
the mass percentage of the binder polyvinylidene fluoride PVDF is in the range of 2.0-3.0%;
the SUPER P conductive agent accounts for 1.0 to 2.4 percent by mass.
The double-sided density of the surface of the positive aluminum foil current collector is in the range of 260 g/square meter to 300 g/square meter.
The N-methyl pyrrolidone is taken as a solvent, the layered active oxide, the carbon nano tube conductive agent, the SUPER P conductive agent and the adhesive polyvinylidene fluoride PVDF are proportionally added, mixed, stirred and dispersed to obtain positive electrode slurry, and the slurry in a liquid state can permeate into the pores of the aluminum foil current collector and moisten the surface of the aluminum foil current collector, so that the active surface area of sodium ions attached to the aluminum foil current collector by the slurry is increased, and the electrochemical performance of the electrode plate is improved to the greatest extent.
The double-sided density of the surface of the positive aluminum foil current collector is in the range of 260-300 g/square meter, so that the coating density is relatively small, the rapid shuttling between ions is facilitated, and ions can be rapidly embedded or extracted when the battery is discharged at a high rate.
The preparation method of the negative plate is similar to the preparation method of the positive plate, and comprises the following steps:
deionized water is used as a solvent, and hard carbon active substances, SUPER P conductive agents and sodium polyacrylate PAA binder are mixed, stirred and dispersed to prepare negative electrode slurry;
coating the negative electrode slurry on the surface of a negative electrode aluminum foil current collector;
drying and rolling the coated anode aluminum foil current collector;
wherein the SUPER P conductive agent accounts for 2.3 to 3.3 percent of the total mass of the conductive agent;
the mass percentage of the adhesive sodium polyacrylate PAA is within the range of 3.5-4.5%;
the density of the aluminum foil current collector coated on the surface of the negative electrode is 160-170 g/square meter.
Deionized water is used as a solvent, and hard carbon active substances, SUPER P conductive agents and sodium polyacrylate PAA binder are mixed, stirred and dispersed according to a proportion to prepare the cathode slurry. The liquid slurry can permeate into the pores of the aluminum foil current collector and moisten the surface of the aluminum foil current collector, so that the active surface area of sodium ions in the aluminum foil current collector, which is adhered by the slurry, is increased, and the electrochemical performance of the electrode plate is improved to the greatest extent.
In addition, as the double-sided density of the aluminum foil current collector coated on the surface of the negative electrode is 160-170 g/square meter, the coating density is relatively small, so that the rapid shuttling between ions is facilitated, and the ions can be rapidly embedded or extracted when the battery is discharged at a high rate.
Example 1
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode. The test results obtained were as follows:
the resistance to electron movement in the winding core is larger and larger when the winding cores are charged and discharged at different multiplying powers, so that the capacitance of the winding core is reduced, and particularly the winding core is lost after multiple times of charging and discharging, namely the capacitance is reduced.
The winding core provided by the embodiment has the capacitance percentage of more than 80% under the condition of high multiplying power 10C when discharging at different multiplying powers, and has the capacitance retention rate of 98.44% in the test of 1C cycle discharge 200 times. Therefore, the coil core prepared according to the embodiment has high energy conversion efficiency, long cycle life, stable performance, simple operation and convenient popularization.
Example two
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 295 g/square meter coated on the surface of the anode aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 170 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode. The test results obtained were as follows:
the winding core provided by the embodiment has the capacitance percentage of more than 80% under the condition of high multiplying power 10C when discharging at different multiplying powers, and has the capacitance retention rate of up to 97.71% in the test of 1C cycle discharge 200 times. Therefore, the coil core prepared according to the embodiment has high energy conversion efficiency, long cycle life, stable performance, simple operation and convenient popularization.
Example III
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode. The test results obtained were as follows:
the winding core provided by the embodiment has the capacitance percentage of more than 80% under the condition of high multiplying power 10C when discharging at different multiplying powers, and has the capacitance retention rate of up to 96.94% in the test of 1C cycle discharge 200 times. Therefore, the coil core prepared according to the embodiment has high energy conversion efficiency, long cycle life, stable performance, simple operation and convenient popularization.
Example IV
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 170 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode.
Example five
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 295 g/square meter coated on the surface of the anode aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode.
Example six
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 170 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode.
Example seven
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 295 g/square meter coated on the surface of the anode aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode.
Example eight
The winding type high-rate sodium ion winding core (hereinafter referred to as winding core) provided by the embodiment comprises the following steps of preparing a positive plate:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 295 g/square meter coated on the surface of the anode aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 170 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
And the prepared positive plate, negative plate and diaphragm are overlapped in the middle to prepare the winding core in a winding mode.
In another embodiment, a winding type high-rate sodium ion winding core is provided, the winding type high-rate sodium ion winding core (hereinafter referred to as winding core) obtained by the preparation method of the winding type high-rate sodium ion winding core provided by any one of the above embodiments is provided, the 10C discharge capacity of the winding core is greater than 80%, and the capacity retention rate of the winding core is greater than 96% after 200 cycles of 1C (the used capacity is discharged for 1 hour and is referred to as 1C discharge). The electricity of the winding core is obtained through experiments to be constant-current discharge at the rate of 10C. The larger the discharge rate, the smaller the capacitance, and the discharge capacity can be more than 80% when at 10C rate, and the other rates less than 10C rate can each have a discharge capacity of more than 80%.
In still another embodiment, a method for manufacturing a wound high-rate sodium ion battery is provided, wherein the winding core provided in the above embodiment is used to manufacture the sodium ion battery through the steps of packaging, liquid injection, high-temperature fixture formation, air extraction, shaping and capacity division.
Example nine
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
The test results obtained were as follows:
referring to fig. 1 and 4, fig. 1 is a graph showing the percentage of discharge capacity of the battery obtained by the configuration of the present embodiment; fig. 4 is a cycle chart of the battery 1C magnification obtained by the configuration of the present embodiment.
The battery provided in this embodiment has a capacitance percentage of 80% or more at a high rate of 10C when discharged at different rates, and a capacitance retention rate of 98.44% in a test in which the 1C cycle is discharged 200 times. Therefore, the battery prepared according to the embodiment has high energy conversion efficiency, long cycle life, stable performance, simple operation and convenient popularization.
Examples ten
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
Solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
The test results obtained were as follows:
referring to fig. 2 and 5, fig. 2 is a graph showing the percentage of discharge capacity of the battery obtained by the configuration of the present embodiment; fig. 5 is a cycle chart of the battery 1C magnification obtained by the configuration of the present embodiment.
The battery provided in this embodiment has a capacity percentage of 80% or more at a high rate of 10C when discharged at different rates, and a capacity retention rate of up to 97.71% in a test in which the discharge is performed 200 times at 1C cycle. Therefore, the battery prepared according to the embodiment has high energy conversion efficiency, long cycle life, stable performance, simple operation and convenient popularization.
Example eleven
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
The test results obtained were as follows:
referring to fig. 3 and 6, fig. 3 is a graph showing the percentage of discharge capacity of the battery obtained by the configuration of the present embodiment; fig. 6 is a cycle chart of the battery 1C magnification obtained by the configuration of the present embodiment.
The battery provided in this embodiment has a capacity percentage of 80% or more at a high rate of 10C when discharged at different rates, and a capacity retention rate of up to 96.94% in a test in which the discharge is performed 200 times at 1C cycle. Therefore, the battery prepared according to the embodiment has high energy conversion efficiency, long cycle life, stable performance, simple operation and convenient popularization.
Example twelve
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 170 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
Example thirteen
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
solvent: n-methylpyrrolidone;
solute: 94.8% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 295 g/square meter coated on the surface of the anode aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.2%; SUPER P (small particle conductive carbon black) conductive agent accounts for 2.8%; sodium polyacrylate PAA accounts for 4.0%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
Examples fourteen
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 280 g/square meter coated on the surface of the provincial aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 170 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
Example fifteen
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 295 g/square meter coated on the surface of the anode aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 165 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
Examples sixteen
The winding type high-rate sodium ion battery (hereinafter referred to as battery) provided in this embodiment comprises the following positive electrode plate preparation:
solvent: n-methylpyrrolidone;
solute: 94.5% of lamellar active oxide by mass; the mass percentage of the carbon nano tube conductive agent is 1.0 percent; the SUPER P (small particle conductive carbon black) conductive agent accounts for 1.7 percent by mass; the mass percentage of the polyvinylidene fluoride PVDF is 2.8%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 4.7:5.3 to obtain positive electrode slurry, coating the positive electrode slurry on the positive electrode aluminum foil current collector with the density of 295 g/square meter coated on the surface of the anode aluminum foil current collector, drying and rolling to obtain the positive electrode plate.
Preparing a negative electrode sheet:
solvent: deionized water
Solute: hard carbon active material accounts for 93.5%; the SUPER P (small particle conductive carbon black) conductive agent accounts for 3.0%; sodium polyacrylate PAA accounts for 3.5%; the sum of the contents of the components of the solute is 100 percent.
And mixing, stirring and dispersing the solvent and the solute in a ratio of 6:4 to obtain negative electrode slurry, coating the negative electrode aluminum foil current collector with the density of 170 g/square meter on the surface of the negative electrode aluminum foil current collector, drying and rolling to obtain the negative electrode plate.
Preparation of a battery:
and (3) preparing a winding core by centrally overlapping the prepared positive plate, negative plate and diaphragm in a winding mode, and then preparing the winding type high-rate sodium ion battery through the procedures of packaging, liquid injection, high-temperature clamp formation, air extraction, shaping and capacity division.
In a further embodiment, a rolled high-rate sodium ion battery is provided, and the rolled high-rate sodium ion battery (hereinafter referred to as battery) obtained by using the method for preparing a rolled high-rate sodium ion battery in the above embodiment has a 10C discharge capacity of greater than 80% and a capacity retention rate of greater than 96% after 200 cycles of 1C (after 1 hour of discharge of the used capacity, referred to as 1C discharge). The electricity of the winding core is obtained through experiments to be constant-current discharge at the rate of 10C. The larger the discharge rate, the smaller the capacitance, and the discharge capacity can be more than 80% when at 10C rate, and the other rates less than 10C rate can each have a discharge capacity of more than 80%.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The preparation method of the winding type high-rate sodium ion winding core is characterized by comprising the following steps of:
the positive plate, the negative plate and the diaphragm are overlapped in the middle to prepare a winding core in a winding mode;
wherein the main material of the positive plate is lamellar oxide, and the mass percentage of the lamellar oxide is in the range of 94.5-95.5%;
the main material of the negative plate is hard carbon active material, and the mass percentage of the hard carbon active material is 92.7% -93.7%.
2. The method for preparing the winding type high-rate sodium ion winding core according to claim 1, wherein the method for preparing the positive plate comprises the following steps:
mixing, stirring and dispersing a layered active oxide, a carbon nano tube conductive agent, a SUPER P conductive agent and a binder polyvinylidene fluoride by taking N-methyl pyrrolidone as a solvent to prepare anode slurry;
Coating the positive electrode slurry on the surface of a positive electrode aluminum foil current collector;
drying and rolling the coated anode aluminum foil current collector;
wherein, the mass percent of the carbon nano tube conductive agent is in the range of 0.5-1.5%;
the mass percentage of the binder polyvinylidene fluoride is within the range of 2.0-3.0%;
the SUPER P conductive agent accounts for 1.0 to 2.4 percent by mass;
the double-sided density of the surface of the positive aluminum foil current collector is in the range of 260 g/square meter to 300 g/square meter.
3. The method for preparing the winding type high-rate sodium ion winding core according to claim 2, wherein,
the double-sided density of the aluminum foil current collector coated on the surface of the positive electrode aluminum foil current collector is 280 g/square meter;
or the double-sided density of the surface of the positive aluminum foil current collector is 295 g/square meter.
4. The method for preparing the winding type high-rate sodium ion winding core according to claim 2, wherein,
the mass percentage of the lamellar active oxide is 94.8%;
the mass percentage of the carbon nano tube conductive agent is 1.0%;
the SUPER P conductive agent is 1.7% by mass;
the mass percentage of the polyvinylidene fluoride is 2.5%;
or, the mass percentage of the lamellar active oxide is 94.5%;
The mass percentage of the carbon nano tube conductive agent is 1.0%;
the SUPER P conductive agent is 1.7% by mass;
the mass percentage of the polyvinylidene fluoride is 2.8%.
5. The method for preparing a wound high-magnification sodium ion core according to any one of claims 1 to 4, wherein the method for preparing the negative electrode sheet comprises the steps of:
deionized water is used as a solvent, and hard carbon active substances, SUPER P conductive agents and sodium polyacrylate binder are mixed, stirred and dispersed to prepare negative electrode slurry;
coating the negative electrode slurry on the surface of a negative electrode aluminum foil current collector;
drying and rolling the coated anode aluminum foil current collector;
wherein the SUPER P conductive agent accounts for 2.3 to 3.3 percent of the total mass of the conductive agent;
the mass percentage of the sodium polyacrylate binder is within the range of 3.5-4.5%;
the density of the aluminum foil current collector coated on the surface of the negative electrode is 160-170 g/square meter.
6. The method for preparing a wound high-magnification sodium ion winding core according to claim 5, wherein the density of the aluminum foil current collector coated on the surface of the negative electrode is 165 g/square meter;
or the density of the aluminum foil current collector coated on the surface of the negative electrode is 170 g/square meter.
7. The method for preparing the winding type high-rate sodium ion winding core according to claim 6, wherein,
the hard carbon active material accounts for 93.2%;
the SUPER P conductive agent accounts for 2.8%;
the sodium polyacrylate accounts for 4.0%;
or, the hard carbon active material is 93.5%;
the SUPER P conductive agent accounts for 3.0%;
the sodium polyacrylate accounts for 3.5%.
8. A wound high-magnification sodium ion winding core, characterized in that the wound high-magnification sodium ion winding core is manufactured according to the manufacturing method of the wound high-magnification sodium ion winding core according to any one of claims 1 to 7.
9. A method for preparing a wound high-rate sodium ion battery, which is characterized by comprising the wound high-rate sodium ion winding core of claim 8; and (3) carrying out the procedures of packaging, liquid injection, high-temperature fixture formation, air extraction, shaping and capacity division on the wound high-magnification sodium ion winding core to obtain the sodium ion battery.
10. A rolled high-rate sodium ion battery, characterized in that the rolled high-rate sodium ion battery is manufactured according to the manufacturing method of the rolled high-rate sodium ion battery of claim 9.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113972393A (en) * | 2021-10-29 | 2022-01-25 | 湖南立方新能源科技有限责任公司 | Sodium ion battery and preparation method thereof |
| US20220052377A1 (en) * | 2018-11-19 | 2022-02-17 | Shanghai Zijian Chemical Technology Co., Ltd | Boron-Containing Plastic Crystal Polymer and Preparation Method therefor and Application thereof |
| CN115548425A (en) * | 2022-10-12 | 2022-12-30 | 雅迪科技集团有限公司 | Composite sodium ion battery and preparation method thereof |
| CN115763947A (en) * | 2022-11-07 | 2023-03-07 | 南开大学 | Ampere-hour-grade sodium ion soft package battery |
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- 2023-03-10 CN CN202310237523.7A patent/CN116315141A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220052377A1 (en) * | 2018-11-19 | 2022-02-17 | Shanghai Zijian Chemical Technology Co., Ltd | Boron-Containing Plastic Crystal Polymer and Preparation Method therefor and Application thereof |
| CN113972393A (en) * | 2021-10-29 | 2022-01-25 | 湖南立方新能源科技有限责任公司 | Sodium ion battery and preparation method thereof |
| CN115548425A (en) * | 2022-10-12 | 2022-12-30 | 雅迪科技集团有限公司 | Composite sodium ion battery and preparation method thereof |
| CN115763947A (en) * | 2022-11-07 | 2023-03-07 | 南开大学 | Ampere-hour-grade sodium ion soft package battery |
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