CN115663179A - Sodium ion battery positive electrode slurry, positive electrode plate, battery and preparation method - Google Patents
Sodium ion battery positive electrode slurry, positive electrode plate, battery and preparation method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a positive electrode slurry of a sodium-ion battery, a positive electrode plate, a battery and a preparation method. The sodium ion battery anode slurry provided by the invention takes sodium iron phosphate as an anode active material, is matched with a sodium supplement agent, and supplements sodium ions consumed for forming a solid electrolyte membrane in the step of a first formation process; and the invalid sodium ions which can not be removed by embedding the negative electrode in the subsequent circulation process, thereby obviously improving the energy density and the first coulombic efficiency of the sodium ion battery; because a strong alkaline solution is generated after the sodium ferrite is added, the alkalinity of the positive pole slurry is increased, the viscosity of the slurry is too high, the agglomeration phenomenon is serious, and the processing performance of a pole piece in the later period is greatly influenced, the alkalinity is neutralized by adding the organic acid, and the problems are avoided; meanwhile, a large amount of gas is generated in the sodium supplement process, and the inventor completely removes the gas generated in the sodium supplement process through specific formation and aging processes and ensures that subsequent circulation has no risk of gas generation.
Description
Technical Field
The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a positive electrode slurry of a sodium-ion battery, a positive electrode plate, a battery and a preparation method.
Background
With the development of society, the application range of lithium ion batteries is more and more extensive, and lithium resources are greatly consumed, so that the situation of lithium resource shortage occurs. Therefore, it is imperative to search for new battery materials, and sodium ion batteries are produced.
The sodium ion battery operates in a similar principle to the lithium ion battery, and operates by using the movement of sodium ions between positive and negative electrodes. Compared with lithium ion batteries, sodium ion batteries have certain advantages in terms of resource abundance and cost, and olivine-type sodium iron phosphate is currently used as a positive electrode material. However, sodium ions coming out of the positive electrode during the first charge of the battery react with the negative electrode to form an SEI film or undergo other side reactions, which results in loss of active sodium ions, so that the same sodium ions cannot come out of the negative electrode and return to the positive electrode during the discharge of the battery, resulting in low initial coulombic efficiency of the material, and the short plates with energy density of the sodium iron phosphate battery due to poor matching with the negative electrode material.
In order to solve the above problems, the prior art discloses a method for supplementing sodium for a positive electrode of a sodium ion battery, which comprises the steps of adding a metal simple substance and sodium salt into a positive electrode material of the sodium ion battery, controlling a voltage range in a first charging process of battery formation, enabling the metal simple substance to completely react with the sodium salt, and releasing sodium ions to make up for sodium ion loss caused by SEI film formation or other side reactions of a negative electrode of the sodium ion battery during battery formation, so that loss of active sodium ions in the positive electrode material is reduced, and the first coulombic efficiency of the sodium ion battery is improved.
However, the theoretical sodium supplement capacity of the method is 425mAh/g, the actual sodium supplement capacity is only about 200mAh/g, and the sodium supplement efficiency is low. The effect is not enough to compensate the loss of sodium ions in active substances by adding a small amount of sodium supplement agent, and excessive metal compounds remain in the battery when the sodium supplement agent is added, so that the potential safety hazards of overlarge internal resistance of the battery, poor battery multiplying power performance, cyclic failure and the like are caused; in addition, the method uses different metals as reactants, introduces metal ions except for the anode material, and has the potential of other side reactions in the later period. In the prior art, other sodium supplementing agents exist, but the problems which are difficult to overcome exist in practical application, for example, alum in the sodium alum phosphate material is extremely toxic, and the possibility of later application is not high; the Prussian blue has more water content and more complex preparation process.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the above defects existing in the sodium ion battery sodium supplement method in the prior art, so as to provide a sodium ion battery positive electrode slurry, a positive electrode plate, a battery, and a preparation method.
Therefore, the invention provides the following technical scheme:
the invention provides a sodium ion battery anode slurry which comprises the following components in percentage by mass:
96-97% of positive active material;
1.5-2% of a conductive agent;
1.5 to 2 percent of binder;
0.1 to 0.5 percent of organic acid;
wherein, the positive active material comprises the following components in percentage by mass (86.5-95.5): sodium iron phosphate and sodium ferrite of (1-10).
Optionally, the organic acid is at least one of oxalic acid and acetic acid;
and/or the conductive agent is at least one of carbon black, graphene, carbon nanotubes, ketjen black and conductive graphite;
and/or the binder is polyvinylidene fluoride.
The invention also provides a positive pole piece of the sodium-ion battery, which comprises a current collector and the positive slurry coated on one side or two sides of the current collector.
The invention also provides a preparation method of the positive pole piece of the sodium-ion battery, which comprises the following steps:
s1, mixing a binder, a conductive agent and sodium ferric phosphate, adding a solvent, stirring, adding sodium ferrite into the mixture in several times during stirring, and adding an organic acid into the mixture to obtain anode slurry;
and S2, coating the positive electrode slurry on the surfaces of one side or two sides of the current collector, and drying to obtain the positive electrode plate of the sodium-ion battery.
Optionally, in step S1, the sodium ferrite is added in three portions:
stirring at 1500-2000rad/min for 60-90min, and adding partial sodium ferrite;
stirring at 1500-2000rad/min for 60-90min, and adding partial sodium ferrite;
stirring at 1500-2000rad/min for 60-90min, adding the rest sodium ferrite, and stirring at 1500-2000rad/min for 60-90min;
alternatively, the mass of sodium ferrite added at each time is the same.
Alternatively, the solvent is N-methylpyrrolidone;
and/or the using amount of the solvent is 45-55% of the solid content of the positive electrode slurry, and the viscosity is 4000-6000CP.
The invention also provides a sodium-ion battery, which comprises the positive pole piece of the sodium-ion battery or the positive pole piece of the sodium-ion battery prepared by the preparation method.
Optionally, the battery also comprises a negative pole piece, a diaphragm and electrolyte.
The invention also provides a preparation method of the sodium ion battery, which comprises the following steps:
s1, stacking a positive pole piece, a diaphragm and a negative pole piece in sequence to obtain a battery cell;
and S2, packaging, injecting electrolyte, forming and aging to obtain the sodium ion battery.
Optionally, the formation is a step-by-step formation, which specifically includes:
(1) Charging the battery cell to 30-60% of capacity by 0.02-0.2C sectional constant current; optionally, the segmented constant-current charging is to charge for 1 to 5 hours at 0.02 to 0.05C and then charge for 1 to 5 hours at 0.05 to 0.2C;
(2) Charging to 3.7V with constant current and constant voltage of 0.1-0.3C, and stopping current to 0.01-0.05C;
(3) Charging to 3.8-4.0V with 0.1-0.3C constant current and constant voltage, and stopping current to 0.01-0.05C; optionally, the step adopts a negative pressure air extraction mode for charging;
and/or the aging step is carried out by standing at 40-50 ℃ for 12-24 hours, discharging gas and packaging to obtain the final battery.
The composition and the preparation method of the negative pole piece are the composition and the preparation method of the negative pole piece which can be used for the sodium-ion battery and are known in the art.
Typically, but not by way of limitation, a negative electrode slurry for a sodium ion battery includes the following components in mass percent:
95% -96% of negative active material;
0.5 to 1 percent of negative electrode conductive agent;
3-4% of a negative electrode binder.
The negative active material may be hard carbon; the negative electrode conductive agent may be carbon black; the negative electrode binder may be a mixture of carboxymethyl cellulose (CMC), styrene Butadiene Rubber (SBR), and polyacrylic acid (PAA) in any ratio, for example, PAA: SBR: CMC = 1.
In the present invention, the separator may be a polypropylene film; the electrolyte of the electrolyte is NaPF 6 The concentration is 1mol/L, and the solvent is a mixture of Ethylene Carbonate (EC), diethyl carbonate (DEC) and dimethyl carbonate (DMC) in any proportion, for example, EC: DEC: DMC = 1.
The technical scheme of the invention has the following advantages:
compared with the existing sodium supplement method, the invention has the simplest mode of directly mixing sodium salt and sodium ferrite into the positive electrode, has higher sodium supplement efficiency compared with other sodium supplement agents in the prior art, and can improve the first efficiency and energy density of the battery cell by adjusting the addition of the sodium ferrite.
The sodium iron phosphate positive electrode material is selected because the stable olivine structure of the sodium iron phosphate positive electrode slurry is similar to lithium iron phosphate, has very good safety performance and cycle performance, has a charging and discharging voltage range of 1.6V-3.7V and is perfectly matched with the gram capacity exertion voltage of the selected sodium ferrite serving as a sodium supplement agent, namely the sodium ion removal voltage, so that the full charge of the formation stage of the sodium iron phosphate battery is ensured, the capacity exertion of the sodium supplement agent is also ensured, and the addition of the sodium ferrite does not bring other metal ions except iron ions into the sodium iron phosphate battery system; in addition, the anode homogenate is simple and the operation is convenient. The sodium ion-supplementing agent is matched with a sodium supplementing agent, and sodium ions consumed for forming a solid electrolyte membrane are supplemented in the step of the primary formation process; and the subsequent cycle process is embedded into the negative electrode and can not be removed, so that the energy density and the first coulombic efficiency of the sodium-ion battery are obviously improved; after the sodium ferrite sodium supplement agent is added, a strong alkaline solution can be generated to cause the alkalinity of the positive pole slurry to be increased, the slurry viscosity is too high, the agglomeration phenomenon is serious, and the processing performance of the pole piece in the later period is greatly influenced, so that the alkalinity is neutralized by adding the organic acid, and the problems are avoided.
According to the preparation method of the sodium ion battery positive pole piece, the sodium ferrite sodium supplement agent is added in a sectional stirring manner, and the time, the adding amount, the stirring speed, the stirring time and the like of sectional addition are controlled, so that the particle agglomeration phenomenon of slurry after the sodium ferrite is added is improved, the positive pole piece is prevented from generating convex points, the problems of cell consistency and internal resistance possibly generated by the cell due to pole piece infiltration in the later period are solved, and the electrochemical performance of the sodium ion battery is further improved.
According to the preparation method of the sodium ion battery, the gas production of the sodium ferrite can be effectively controlled by limiting the formation step, and the generated oxygen is completely removed in the formation aging process link, so that the expansion and failure of the battery core caused by gas production again in the subsequent cycle process are not influenced. The reason is that the sodium supplement agent sodium ferrite gram capacity exerting voltage, namely the sodium ion extraction voltage is 3.8V-4.1V; the full charge voltage of the nickel-cobalt sodium manganate as the sodium-electricity positive electrode material at present is 4.3V and far exceeds the capacity exertion voltage of a sodium ferrite serving as a sodium supplement agent, and oxygen generated by the capacity exertion of the sodium supplement agent can react with electrolyte under the high-voltage condition, so that a series of failure problems in the later period of the battery cell can be caused.
Detailed Description
The following examples are provided to better understand the present invention, not to limit the best mode, and not to limit the content and protection scope of the present invention, and any product that is the same or similar to the present invention and is obtained by combining the present invention with other features of the prior art and the present invention falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
A sodium ion battery comprises the following specific components and a preparation method:
(1) Weighing 1.5g of sodium ferrite serving as a sodium supplement, and averagely dividing into three parts;
(2) Adding 1.5g of a binder polyvinylidene fluoride (Fuhloline FL 2032), 1.5g of a conductive agent carbon black and 95g of sodium iron phosphate into a mixing tank, stirring at the speed of 400rad/min for 60min, adding 100g of NMP (N-methyl pyrrolidone) after uniformly stirring, stirring at the speed of 1500rad/min for 60min, adding a first sodium supplement agent after uniformly stirring, stirring at the speed of 1500rad/min for 60min, adding a second sodium supplement agent, stirring at the speed of 1500rad/min for 60min, adding a third sodium supplement agent, and stirring at the speed of 1500rad/min for 60min;
(3) Adding 0.5g of oxalic acid, uniformly mixing to obtain positive electrode slurry, and testing to obtain the positive electrode slurry with the viscosity of 4000CP;
(4) The positive electrode slurry was added at 17mg/cm 3 The surface density of the positive current collector is evenly coated on one surface of the positive current collector, then the positive current collector is heated and dried, and after the heating and drying are finished, the positive current collector is further coated on the other surface of the positive current collector17mg/cm 3 Uniformly coating the positive electrode slurry, and heating and drying to obtain a positive electrode plate containing a positive electrode active material layer;
(5) The negative pole piece comprises 95g of negative active substance hard carbon, 1g of negative conductive agent carbon black and 4g of negative binder, wherein the negative binder is a mixture of carboxymethyl cellulose (long light mac 300), styrene butadiene rubber (Huachuang 403 b) and polyacrylic acid (alderich-la 133) in a mass ratio of 1;
(6) The preparation method of the negative pole piece comprises the following steps: the negative electrode slurry was added at 8mg/cm 3 The surface density of the anode current collector is evenly coated on one surface of the anode current collector, then the anode current collector is heated and dried, and after the heating and drying are finished, the anode current collector is coated on the other surface of the anode current collector at the ratio of 8mg/cm 3 Uniformly coating the negative electrode slurry, and heating and drying to obtain a negative electrode plate containing a negative electrode active material layer;
(7) The separator used in this example was a polypropylene film (enjie 0161); the electrolyte of the electrolyte is NaPF 6 1mol/L, ethylene carbonate EC: diethyl carbonate DEC: dimethyl carbonate DMC = 1;
(8) Stacking the positive pole piece, the diaphragm and the negative pole piece in sequence to enable the diaphragm to be positioned between the positive pole piece and the negative pole piece to play a role in isolation, and then stacking to obtain a bare cell; welding electrode lugs on the positive electrode and the negative electrode, pre-packaging an aluminum-plastic film, drying, and injecting electrolyte; sealing, forming, aging, exhausting and finally sealing to finally obtain the soft package sodium ion battery; the formation and aging process comprises the following specific operations: the first step is a pre-formation process of sodium iron phosphate, namely, charging for 5 hours at 0.02C constant current, changing to 0.1C charging for 5 hours, and charging to 60% capacity of a battery cell; the second step is a formation full charge step of sodium iron phosphate, namely, charging to 3.7V at a constant current and a constant voltage of 0.2C, and stopping the current to 0.01C; the third step is a sodium ferrite decomposition gas production process, namely, constant current and constant voltage charging at 0.1 ℃ to 3.8V is carried out until the current is 0.01C. In the process, the air extractor is adopted for negative pressure air extraction in the whole process, so that the soft package battery is ensured not to swell due to gas generation, and the electrolyte is not extracted; and the fourth step is a high-temperature aging stage, namely standing the formed and air-extracted battery core at a high temperature of 45 ℃ for 12 hours, and finally exhausting and packaging the battery.
Example 2
A sodium ion battery, differing from example 1 in that: 93.5g of sodium ferric phosphate, 3g of sodium ferrite and 15 hours of standing at 45 ℃ in the aging stage.
Example 3
A sodium ion battery, differing from example 1 in that: the dosage of the sodium ferric phosphate is 90.5g, the dosage of the sodium ferrite is 5g, and the aging stage is standing for 20 hours at 45 ℃.
Example 4
A sodium ion battery, differing from example 1 in that: 86.5g of sodium ferric phosphate, 10g of sodium ferrite, 1.5g of positive electrode conductive agent, 1.5g of positive electrode binder and 0.5g of oxalic acid, and standing for 24 hours at the aging stage at 45 ℃.
Example 5
A sodium ion battery, differing from example 1 in that: the dosage of the sodium ferric phosphate is 95.5g, the dosage of the sodium ferrite is 1g, the dosage of the positive electrode conductive agent is 1.5g, the dosage of the positive electrode binder is 1.5g, and the dosage of the oxalic acid is 0.5g.
Comparative example 1
A sodium ion battery, differing from example 1 in that: the operation of the step (2) is that,
adding 1.5g of binder polyvinylidene fluoride, 1.5g of conductive agent carbon black and 95g of sodium iron phosphate into a mixing tank, stirring at the speed of 400rad/min for 60min, adding 100g of solvent NMP after uniform stirring, stirring at the speed of 1500rad/min for 60min, adding sodium supplement after uniform stirring, and stirring at the speed of 1500rad/min for 60min.
Comparative example 2
A sodium ion battery, differing from example 1 in that: oxalic acid was not added.
Comparative example 3
A sodium ion battery, differing from example 1 in that: sodium oxide is used as sodium supplement instead of sodium ferrite.
Comparative example 4
A sodium ion battery, differing from example 1 in that: sodium sulfide is used as sodium supplement instead of sodium ferrite.
Comparative example 5
A sodium ion battery, differing from example 1 in that: no sodium supplement is added.
Comparative example 6
A sodium ion battery, differing from example 1 in that: in the formation method, the sodium supplement capacity is exerted, and the charging cut-off voltage is changed from 3.8V to 3.7V.
Comparative example 7
A sodium ion battery, differing from example 1 in that: in the formation system, the sodium supplement agent capacity is exerted, and the charging cut-off voltage is changed from 3.8V to 4.2V.
Test example
The sodium ion batteries provided in the examples and the comparative examples were subjected to electrical performance tests, and the specific test methods were:
first coulombic efficiency: at normal temperature, after the battery cell is fully charged, the first coulombic efficiency of the battery cell = first discharge capacity/first charge capacity of the battery cell. Wherein, the first discharge capacity: standing the battery after the formation and aging stage at normal temperature for 30min, and then discharging the battery at constant current of 0.5C until the voltage is 1.5V to obtain the first discharge capacity; first-time charging capacity: the total charge capacity of the battery formation stage in each embodiment is the charge capacity of the battery from the pre-formation stage, which is charged for 1-5h at 0.02C-0.05C, then charged for 1-5h at 0.05-0.2C, added with the charge capacity of the full-formation stage, which is charged to 3.7V at constant current and constant voltage at 0.1C-0.3C, and cut off to 0.01C-0.05C, and added with the charge capacity of the sodium supplement development stage, which is charged to 3.8-4.0V at constant current and constant voltage at 0.1C-0.3C, and cut off to 0.01C-0.05C.
Energy density: under the condition of normal temperature, the battery is charged at constant current of 0.5C until the voltage of the battery is 3.7V, and then is charged at constant voltage of 3.7V until the charging current is 0.05C, and the charging is stopped. The battery is placed for 30min, the battery is discharged by 1C current, the discharge cut-off voltage is 1.5V, the normal-temperature discharge capacity is obtained, and then the mass of the battery is weighed, wherein the energy density = the discharge capacity/the mass of the battery.
The specific test results are shown in the following table:
TABLE 1
From the data in the table above: as can be seen from comparison of the data in examples 1 to 5, as the addition amount of the sodium supplement agent increases, the aging time required by the battery cell increases (because the more the addition amount of the sodium supplement agent is, the more the latent gas generation is, and therefore, more high-temperature aging time is required to completely discharge the gas), the first efficiency of the battery cell increases, and the energy density of the battery cell gradually increases; the data of comparative example 1 show that the addition of the sodium supplement agent at one time can cause serious agglomeration of positive slurry particles and abnormal coating; the comparison between the comparative example 5 and the example 1 shows that the first efficiency of the battery cell without the sodium supplement agent is obviously lower than that of the battery cell with the sodium supplement agent; as can be seen from the comparison between the comparative example 2 and the example 1, the absence of oxalic acid in the positive electrode slurry can cause the viscosity of the positive electrode slurry to be too high, and the slurry is solidified and cannot be normally coated; compared with the embodiment 1, the comparative examples 3 and 4 adopt sodium sulfide and sodium oxide as sodium supplement agents, the lithium supplement efficiency is lower, and the first efficiency and the energy density are not as high as the performance improvement brought by the sodium ferrite as the sodium supplement agent; as can be seen from the comparison between the comparative example 6 and the example 1, when the sodium supplement voltage in the formation system is reduced from 3.8V to 3.7V, the sodium supplement does not play a role, and compared with the scheme of the comparative example 5 without the sodium supplement, the performance is not improved at all; from comparison between comparative example 7 and example 1, it is known that when the sodium supplement applied voltage in the formation system is increased from 3.8V to 4.2V, the first efficiency and energy density of the battery cell are not improved, and higher voltage brings more side reactions of the electrolyte.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The positive electrode slurry of the sodium-ion battery is characterized by comprising the following components in percentage by mass:
96-97% of positive active material;
1.5-2% of a conductive agent;
1.5 to 2 percent of binder;
0.1 to 0.5 percent of organic acid;
wherein, the positive active material comprises the following components in percentage by mass (86.5-95.5): sodium iron phosphate and sodium ferrite of (1-10).
2. The positive electrode slurry for sodium-ion batteries according to claim 1, characterized in that said organic acid is at least one of oxalic acid, acetic acid;
and/or the conductive agent is at least one of carbon black, graphene, carbon nanotubes, ketjen black and conductive graphite;
and/or the binder is polyvinylidene fluoride.
3. A positive pole piece of a sodium-ion battery, which is characterized by comprising a current collector and the positive pole slurry of claim 1 or 2 coated on one side or two sides of the current collector.
4. The preparation method of the positive pole piece of the sodium-ion battery of claim 3, which is characterized by comprising the following steps:
s1, mixing a binder, a conductive agent and sodium ferric phosphate, adding a solvent, stirring, adding sodium ferrite into the mixture in multiple times during stirring, and adding an organic acid into the mixture to obtain anode slurry;
and S2, coating the positive electrode slurry on the surfaces of one side or two sides of the current collector, and drying to obtain the positive electrode plate of the sodium-ion battery.
5. The method for preparing the positive pole piece of the sodium-ion battery according to claim 4, wherein in the step S1, the sodium ferrite is added in three times:
stirring at 1500-2000rad/min for 60-90min, and adding partial sodium ferrite;
stirring at 1500-2000rad/min for 60-90min, and adding partial sodium ferrite;
stirring at 1500-2000rad/min for 60-90min, adding the rest sodium ferrite, and stirring at 1500-2000rad/min for 60-90min;
alternatively, the mass of sodium ferrite is the same for each addition.
6. The preparation method of the positive pole piece of the sodium-ion battery as claimed in claim 4 or 5, wherein the solvent is N-methylpyrrolidone;
and/or the solvent is used in an amount such that the solid content of the positive electrode slurry is 45-55% and the viscosity is 4000-6000CP.
7. A sodium-ion battery is characterized by comprising the positive pole piece of the sodium-ion battery in claim 3 or the positive pole piece of the sodium-ion battery prepared by the preparation method in any one of claims 4 to 6.
8. The sodium ion battery of claim 7, further comprising a negative electrode tab, a separator, and an electrolyte.
9. A method of making a sodium ion battery according to claim 7 or 8, comprising the steps of:
s1, stacking a positive pole piece, a diaphragm and a negative pole piece in sequence to obtain a battery cell;
and S2, packaging, injecting electrolyte, forming and aging to obtain the sodium ion battery.
10. The method for preparing a sodium-ion battery according to claim 9, wherein the formation is a step-by-step formation, specifically comprising:
(1) Charging the battery cell to 30-60% of capacity by 0.02-0.2C sectional constant current; optionally, the segmented constant-current charging is performed for 1 to 5 hours at 0.02 to 0.05C, and then for 1 to 5 hours at 0.05 to 0.2C;
(2) Charging to 3.7V with 0.1-0.3C constant current and constant voltage, and stopping current to 0.01-0.05C;
(3) Charging to 3.8-4.0V with 0.1C-0.3C constant current and voltage, and stopping current to 0.01C-0.05C; optionally, the step adopts a negative pressure air extraction mode for charging;
and/or the aging step is carried out by standing at 40-50 ℃ for 12-24 hours, exhausting gas and packaging to obtain the final battery.
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| CN116646588A (en) * | 2023-07-25 | 2023-08-25 | 江苏众钠能源科技有限公司 | Sodium ion battery, battery module, battery pack and electricity utilization device |
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| CN116646588A (en) * | 2023-07-25 | 2023-08-25 | 江苏众钠能源科技有限公司 | Sodium ion battery, battery module, battery pack and electricity utilization device |
| CN116646588B (en) * | 2023-07-25 | 2023-10-20 | 江苏众钠能源科技有限公司 | Sodium ion battery, battery module, battery pack and electricity utilization device |
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