CN113594418A - Preparation method of positive pole piece, preparation method of battery, positive pole piece and battery - Google Patents

Preparation method of positive pole piece, preparation method of battery, positive pole piece and battery Download PDF

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Publication number
CN113594418A
CN113594418A CN202110823381.3A CN202110823381A CN113594418A CN 113594418 A CN113594418 A CN 113594418A CN 202110823381 A CN202110823381 A CN 202110823381A CN 113594418 A CN113594418 A CN 113594418A
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positive
pole piece
battery
positive electrode
preparing
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杜建国
张健
张俊洋
杨彩玲
周凌
金圣琪
王炜娜
罗广求
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Tianjin Space Power Technology Co ltd
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Tianjin Space Power Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/139—Processes of manufacture
    • H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a preparation method of a positive pole piece, a preparation method of a battery, the positive pole piece and the battery, belonging to the technical field of secondary lithium ion batteries, wherein the preparation method of the positive pole piece comprises the following steps: s1, heating and dissolving the positive adhesive in an NMP solvent according to the proportion of 5-10%, wherein the heating temperature is 50-80 ℃, and preparing positive adhesive; s2, adding a conductive agent into the positive glue according to the proportion of 2-15%; s3, adding an ionic conduction agent according to the proportion of 2-15%, and stirring at the temperature of 25-60 ℃ to prepare a conductive agent and ionic conduction agent slurry; s4, adding a positive electrode material into the slurry according to the proportion of 70-95%, and stirring at the temperature of 25-60 ℃ to prepare positive electrode slurry; and S5, coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 3-10 m/min, and the drying temperature is 85-130 ℃, so as to prepare the positive electrode piece.

Description

Preparation method of positive pole piece, preparation method of battery, positive pole piece and battery
Technical Field
The invention belongs to the technical field of secondary lithium ion batteries, and particularly relates to a preparation method of a positive pole piece, a preparation method of a battery, the positive pole piece and the battery.
Background
The lithium ion secondary battery has the advantages of large specific energy, small self-discharge, high specific power, good cycle characteristic, quick charging, wide working temperature range, high efficiency, no environmental pollution and the like, and is generally applied to the fields of portable electronic equipment, large-scale energy storage equipment, electric automobiles and the like in recent years.
The polymer/flexible package lithium ion battery adopts a light aluminum plastic film as an outer packaging material, has high mass specific energy, excellent safety performance, flexible size and very wide application, and particularly occupies a main market as a power supply of consumer electronic products. However, the existing polymer/flexible package lithium ion battery is mainly applied with a low rate of less than 1C, has poor high rate performance, cannot meet the application requirements of high specific power of power supplies in model airplane batteries and special fields, and has the problem of low specific energy generally existing in the existing power type battery. With the rapid development of the electric automobile industry, the application of the lithium ion battery in the aspect of power energy storage power supply is increased year by year. When the automobile is started and climbs, the motor needs larger current, the charging time requirement in the running of the automobile is as short as possible, and the technical requirements on the lithium ion battery capable of high-rate charging and discharging and high-power output are more and more urgent.
At present, the rate performance of the high-power battery is improved mainly from two aspects of a battery structure and an electrochemical system. The multiplying power performance of the battery is improved mainly from the aspects of the coating mode, the compaction density, the winding mode of a battery core and the like of an electrode in the aspect of the battery structure; in the aspect of an electrochemical system, high-conductivity active materials such as graphene and capacitance carbon are doped, and the proportion of positive and negative electrode slurry is changed to prepare the lithium ion capacitor, so that the rate capability of the battery is improved.
The electrode positive electrode slurry mixing ratio has a large influence on high-power discharge performance, and the conventional method at present is to increase the type and the amount of a conductive agent in the positive electrode mixing ratio, so that the conductivity of a positive electrode plate is increased, the internal resistance of a battery is reduced, and the rate performance is improved. However, the conductive agent is increased to a certain degree, and the increase of the internal resistance is not obvious any more, so that the finding of other ways for reducing the internal resistance of the positive pole piece has important significance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a preparation method of a positive pole piece, a preparation method of a battery, the positive pole piece and the battery, and the ionic conductivity of the pole piece is improved on the basis of increasing the electronic conductivity of the pole piece. On the basis of increasing the types and the using amount of the conductive agent, materials with high ionic conductivity, such as a fast ion conductor, a solid electrolyte, lithium salt, ionic liquid and the like, are added into the positive electrode slurry according to a certain proportion, so that the ionic conductivity and the electronic conductivity of the positive electrode plate are improved, the internal resistance of the electrode plate is reduced, and the multiplying power performance of the battery is improved.
The first purpose of the invention is to provide a preparation method of a positive pole piece, which comprises the following steps:
s1, heating and dissolving the positive adhesive in an NMP solvent according to the proportion of 5-10%, wherein the heating temperature is 50-80 ℃, and preparing positive adhesive;
s2, adding a conductive agent into the positive glue according to the proportion of 2-15%, and stirring for at least 2 h;
s3, adding a solid electrolyte, an ionic liquid, a lithium salt and other ionic conductive agents according to the proportion of 2-15%, stirring for at least 2 hours at the stirring temperature of 25-60 ℃, and preparing conductive agent and ionic conductive agent slurry;
s4, adding a positive electrode material into the slurry according to the proportion of 70-95%, stirring for at least 12h at the stirring temperature of 25-60 ℃ to prepare positive electrode slurry;
and S5, coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 3-10 m/min, and the drying temperature is 85-130 ℃, so as to prepare the positive electrode piece.
Preferably: the positive binder is one or a combination of a plurality of polyethylene oxide, polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene.
Preferably: the conductive agent is one or a combination of more of conductive carbon black, conductive graphite, vapor-grown carbon fiber, carbon nano tube and graphene.
Preferably: the solid electrolyte is Li7La3Zr2O12(LLZO)、Li3xLa2/3–xTiO3(LLTO)、LiT2(PO4)3、Li3–2xMxHalO、LiPON、Li10Ge P2S12(LGPS)、Li2S–SiS2One or more combinations of (a); wherein T is Ti, Ge, Zr; m is Mg2+、Ca2+、Sr2+Or Ba2+。
Preferably: the ionic liquid is one or a combination of more of 1-methyl-3-ethylimidazole diimine, 1-methyl-3-ethylimidazole tetrafluoroboric acid, 1-methyl-3-butylimidazole tetrafluoroboric acid, 1-butyl-2, 3-dimethyl imidazole imine, 1-methyl-3-butylimidazole diimine and N-methyl-N-butyl piperidine diimine.
Preferably: the cathode material is layered LiCoO2、LiNiO2And LiNixCo1-xO2And ternary LiNi1/3Mn1/3Co1/ 3O2And LiNi0.85Co0.1Al0.05O2Spinel LiMn2O45V spinel LiNi0.5Mn1.5O4Phosphate LiMPO4(M ═ Fe, Mn) and a lithium-rich manganese-based positive electrode material Li [ Li ]x(MnM)1-x]O2(M ═ Ni, Co, Fe) in a proportion of 80% to 95%.
Preferably: the lithium salt is one or a combination of more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium difluorooxalato borate, lithium bis (oxalato) borate, lithium bis (trifluoromethylsulfonyl) imide and lithium bis (fluorosulfonato) imide.
A second object of the present invention is to provide a method for manufacturing a battery, comprising at least:
s101, preparing a positive pole piece based on the preparation method of the positive pole piece;
s102, rolling and slitting the dried positive pole piece to prepare a positive pole piece; rolling and slitting the dried negative pole piece to prepare a negative pole piece;
s103, coating the positive pole piece by using a diaphragm, and preparing a battery cell by adopting a method of alternately placing a positive pole and a negative pole according to the capacity of the battery;
and S104, packaging the battery cell by using an aluminum plastic film, injecting corresponding high-power electrolyte, and preparing the battery by vacuum packaging.
The third purpose of the invention is to provide a positive pole piece, which is prepared by the preparation method of the positive pole piece.
The fourth purpose of the invention is to provide a battery prepared by the preparation method of the battery.
The beneficial effect of this application is:
according to the invention, the ionic conductivity of the anode can be effectively increased and the high-rate discharge performance of the anode material can be improved by adding the ionic conductive agent, the fast ionic conductor, the solid electrolyte, the lithium salt and other additives into the anode slurry.
The technical scheme of the invention has universality, can be used for different anode materials, and increases the diversity of high-power electrode preparation.
The technical scheme of the invention has sustainability, and the high-rate discharge performance of the lithium battery anode material can be continuously improved along with the development of the additive.
In conclusion, the invention adds the additives such as the ionic conductive agent, the fast ionic conductor, the solid electrolyte, the novel lithium salt and the like into the positive electrode slurry to increase the ionic conductivity of the positive electrode plate, thereby increasing the power performance of the battery. The method has the advantages of simplicity, high efficiency, easiness in expanded production, high universality and good sustainability.
The invention improves the ionic conductivity and the electronic conductivity of the positive pole piece, thereby improving the rate capability of the battery, and the battery can realize the rate discharge of more than 40C.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a graph of battery discharge voltage at different rates;
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
A preparation method of a positive pole piece comprises the following steps:
step one, heating and dissolving a positive adhesive in an NMP solvent according to the proportion of 5-10%, wherein the heating temperature is 50-80 ℃, and preparing a positive adhesive;
secondly, adding a conductive agent into the positive glue according to the proportion of 2-15%, and stirring for more than 2 hours; then adding an ionic conductive agent according to the proportion of 2-15%, stirring for more than 2 hours at the stirring temperature of 25-60 ℃ to prepare conductive agent and ionic conductive agent slurry;
adding a positive electrode material into the slurry according to the proportion of 70-95%, stirring for more than 12 hours at the stirring temperature of 25-60 ℃ to prepare positive electrode slurry;
and step four, coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 3-10 m/min, the drying temperature is 85-130 ℃, and the positive electrode piece is prepared. Wherein:
positive electrode binder: one or more combinations of polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP);
conductive agent: one or more of conductive carbon black Super P Li, conductive graphite, vapor grown carbon fiber VGCF, carbon nanotube CNTs and Graphene;
solid electrolyte: li7La3Zr2O12(LLZO)、Li3xLa2/3–xTiO3(LLTO)、LiT2(PO4)3(T is Ti, Ge, Zr, etc.), Li3–2xMxHalO, (where M is Mg)2+、Ca2+、Sr2+Or Ba2+High valence cations), LiPON、Li10Ge P2S12(LGPS)、Li2S–SiS2And the like in one or more combinations.
Ionic liquid: 1-methyl-3-ethylimidazole bis (trifluoromethylsulfonyl) imide ([ EMI)][TFSI]) 1-methyl-3-ethylimidazole tetrafluoroboric acid ([ EMI ]][BF4]) 1-methyl-3-butylimidazolium tetrafluoroborate ([ BMI ]][BF4]) 1-butyl-2, 3-dimethylimidazole (trifluoromethylsulfonyl) imide (buty-DMim TFSI), 1-methyl-3-butylimidazole bis (trifluoromethylsulfonyl) imide ([ C)1C4IM][TFSI]) N-methyl-N-butylpiperidine bis (trifluoromethylsulfonyl) imide ([ PP ]14][TFSI]) And the like in one or more combinations.
A positive electrode material: layered LiCoO2、LiNiO2And LiNixCo1-xO2Ternary LiNi1/3Mn1/3Co1/3O2And LiNi0.85Co0.1Al0.05O2Spinel LiMn2O45V spinel LiNi0.5Mn1.5O4Phosphate LiMPO4(M ═ Fe, Mn) and a lithium-rich manganese-based positive electrode material Li [ Li ]x(MnM)1-x]O2(M ═ Ni, Co, Fe) in a ratio of 80% to 95%.
Lithium salt: lithium hexafluorophosphate (LiPF)6) Lithium tetrafluoroborate (LiBF)4) Lithium perchlorate (LiClO)4) Lithium difluoro (oxalato) borate (LiODFB), lithium bis (oxalato) borate (LiBOB), lithium bis (trifluoromethylsulfonyl) imide (LiTFSI), lithium bis (fluorosulfonyl) imide (LiFSI).
A positive pole piece is prepared by the preparation method of the positive pole piece.
A method of making a battery comprising the steps of:
step 1, rolling and slitting the dried positive pole piece to prepare a positive pole piece; preparing a negative pole piece by the same method for the negative pole;
and 2, coating the positive pole piece by using a diaphragm with a certain thickness and material. And preparing the battery core by adopting a method of alternately placing the anode and the cathode according to the capacity of the battery.
And 3, packaging the battery cell by using an aluminum plastic film, injecting corresponding high-power electrolyte, and preparing the high-power lithium ion battery by vacuum packaging.
A battery is prepared by the preparation method of the battery.
The following is described in detail with reference to the specific case and fig. 1:
example 1
Preparing positive glue: adding 1kg of positive binder PVDF into 19kg of NMP solvent, heating and dissolving at 50-80 ℃, and stirring for more than 2 hours to prepare 5% of positive adhesive;
slurry homogenization: taking 20kg of positive glue, adding 1kg of conductive carbon black Super P Li and 1kg of vapor grown carbon fiber VGCF, and stirring for more than 2 h; finally adding LiCoO as a positive electrode material245kg, stirring for more than 10 hours at normal temperature to obtain anode slurry;
coating: and coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 8m/min, and the drying temperature is 120 ℃, so that the positive electrode piece is prepared.
Assembling the battery: rolling and slitting the dried positive pole piece to prepare a positive pole piece; preparing a negative pole piece by the same method for the negative pole; and coating the positive pole piece by using a diaphragm with a certain thickness and material. And preparing the battery core by adopting a method of alternately placing the anode and the cathode according to the capacity of the battery. And packaging the battery cell by using an aluminum plastic film, injecting corresponding high-power electrolyte, and preparing the 3Ah high-power lithium ion battery by vacuum packaging.
Example 2
Preparing positive glue: adding 1kg of positive binder PVDF into 19kg of NMP solvent, heating and dissolving at 50-80 ℃, and stirring for more than 2 hours to prepare 5% of positive adhesive;
slurry homogenization: taking 20kg of positive glue, adding 1kg of conductive carbon black Super P Li and 1kg of vapor grown carbon fiber VGCF, and stirring for more than 2 h; 2kg of solid electrolyte Li were then added7La3Zr2O12(LLZO), stirring for more than 2h, and finally adding LiCoO as a positive electrode material245kg, stirring for more than 10 hours at normal temperature to obtain anode slurry;
coating: and coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 8m/min, and the drying temperature is 120 ℃, so that the positive electrode piece is prepared.
Assembling the battery: rolling and slitting the dried positive pole piece to prepare a positive pole piece; preparing a negative pole piece by the same method for the negative pole; and coating the positive pole piece by using a diaphragm with a certain thickness and material. And preparing the battery core by adopting a method of alternately placing the anode and the cathode according to the capacity of the battery. And packaging the battery cell by using an aluminum plastic film, injecting corresponding high-power electrolyte, and preparing the 3Ah high-power lithium ion battery by vacuum packaging.
Example 3
Preparing positive glue: adding 1kg of positive binder PVDF into 19kg of NMP solvent, heating and dissolving at 50-80 ℃, and stirring for more than 2 hours to prepare 5% of positive adhesive;
slurry homogenization: taking 20kg of positive glue, adding 1kg of conductive carbon black Super P Li and 1kg of vapor grown carbon fiber VGCF, and stirring for more than 2 h; adding 2kg of carbon nano tube CNTs, stirring for more than 2h, and finally adding a positive electrode material LiCoO245kg, stirring for more than 10 hours at normal temperature to obtain anode slurry;
coating: and coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 8m/min, and the drying temperature is 120 ℃, so that the positive electrode piece is prepared.
Assembling the battery: rolling and slitting the dried positive pole piece to prepare a positive pole piece; preparing a negative pole piece by the same method for the negative pole; and coating the positive pole piece by using a diaphragm with a certain thickness and material. And preparing the battery core by adopting a method of alternately placing the anode and the cathode according to the capacity of the battery. And packaging the battery cell by using an aluminum plastic film, injecting corresponding high-power electrolyte, and preparing the 3Ah high-power lithium ion battery by vacuum packaging.
Example 4
Preparing positive glue: adding 1kg of positive binder PVDF into 19kg of NMP solvent, heating and dissolving at 50-80 ℃, and stirring for more than 2 hours to prepare 5% of positive adhesive;
slurry homogenization: taking 20kg of positive glue, adding 1kg of conductive carbon black Super P Li and 1kg of vapor grown carbon fiber VGCF, and stirring for more than 2 h; 1kg of carbon was added theretoNanotube CNTs and 1kg of solid electrolyte Li7La3Zr2O12(LLZO), stirring for more than 2h, and finally adding LiCoO as a positive electrode material245kg, stirring for more than 10 hours at normal temperature to obtain anode slurry;
coating: and coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 8m/min, and the drying temperature is 120 ℃, so that the positive electrode piece is prepared.
Assembling the battery: rolling and slitting the dried positive pole piece to prepare a positive pole piece; preparing a negative pole piece by the same method for the negative pole; and coating the positive pole piece by using a diaphragm with a certain thickness and material. And preparing the battery core by adopting a method of alternately placing the anode and the cathode according to the capacity of the battery. And packaging the battery cell by using an aluminum plastic film, injecting corresponding high-power electrolyte, and preparing the 3Ah high-power lithium ion battery by vacuum packaging.
Examples of the experiments
1. And (3) testing the electrochemical performance of the battery:
alternating current internal resistance, 1C discharge capacity, 10C discharge capacity, 20C discharge capacity, 30C discharge capacity and 40C discharge capacity of the 3Ah soft package batteries in the examples 1 to 4 were tested.
Table 1 shows comparative data of different electrochemical performances of 3Ah soft package batteries in examples 1-4
Figure BDA0003172676480000071
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A preparation method of a positive pole piece is characterized by at least comprising the following steps:
s1, heating and dissolving the positive adhesive in an NMP solvent according to the proportion of 5-10%, wherein the heating temperature is 50-80 ℃, and preparing positive adhesive;
s2, adding a conductive agent into the positive glue according to the proportion of 2-15%, and stirring for at least 2 h;
s3, adding a solid electrolyte, an ionic liquid, a lithium salt and other ionic conductive agents according to the proportion of 2-15%, stirring for at least 2 hours at the stirring temperature of 25-60 ℃, and preparing conductive agent and ionic conductive agent slurry;
s4, adding a positive electrode material into the slurry according to the proportion of 70-95%, stirring for at least 12h at the stirring temperature of 25-60 ℃ to prepare positive electrode slurry;
and S5, coating the positive electrode by using coating equipment according to a certain coating amount, wherein the coating speed is 3-10 m/min, and the drying temperature is 85-130 ℃, so as to prepare the positive electrode piece.
2. The method for preparing the positive electrode plate according to claim 1, characterized in that: the positive binder is one or a combination of a plurality of polyethylene oxide, polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene.
3. The method for preparing the positive electrode plate according to claim 1, characterized in that: the conductive agent is one or a combination of more of conductive carbon black, conductive graphite, vapor-grown carbon fiber, carbon nano tube and graphene.
4. The method for preparing the positive electrode plate according to claim 1, characterized in that: the solid electrolyte is Li7La3Zr2O12(LLZO)、Li3xLa2/3–xTiO3(LLTO)、LiT2(PO4)3、Li3–2xMxHalO、LiPON、Li10Ge P2S12(LGPS)、Li2S–SiS2One or more combinations of (a); wherein T is Ti, Ge, Zr; m is Mg2+、Ca2+、Sr2+Or Ba2+。
5. The method for preparing the positive electrode plate according to claim 1, characterized in that: the ionic liquid is one or a combination of more of 1-methyl-3-ethylimidazole diimine, 1-methyl-3-ethylimidazole tetrafluoroboric acid, 1-methyl-3-butylimidazole tetrafluoroboric acid, 1-butyl-2, 3-dimethyl imidazole imine, 1-methyl-3-butylimidazole diimine and N-methyl-N-butyl piperidine diimine.
6. The method for preparing the positive electrode plate according to claim 1, characterized in that: the cathode material is layered LiCoO2、LiNiO2And LiNixCo1-xO2And ternary LiNi1/3Mn1/3Co1/3O2And LiNi0.85Co0.1Al0.05O2Spinel LiMn2O45V spinel LiNi0.5Mn1.5O4Phosphate LiMPO4(M ═ Fe, Mn) and a lithium-rich manganese-based positive electrode material Li [ Li ]x(MnM)1-x]O2(M ═ Ni, Co, Fe) in a proportion of 80% to 95%.
7. The method for preparing the positive electrode plate according to claim 1, characterized in that: the lithium salt is one or a combination of more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium difluoro oxalate borate, lithium bis (trifluoromethylsulfonyl) imide and lithium bis fluoro sulfonyl imide.
8. A method of making a battery, comprising at least:
s101, preparing a positive pole piece based on the preparation method of the positive pole piece of any one of claims 1 to 7;
s102, rolling and slitting the dried positive pole piece to prepare a positive pole piece; rolling and slitting the dried negative pole piece to prepare a negative pole piece;
s103, coating the positive pole piece by using a diaphragm, and preparing a battery cell by adopting a method of alternately placing a positive pole and a negative pole according to the capacity of the battery;
and S104, packaging the battery cell by using an aluminum plastic film, injecting corresponding high-power electrolyte, and preparing the battery by vacuum packaging.
9. A positive pole piece is characterized by being prepared by the preparation method of the positive pole piece according to any one of claims 1 to 7.
10. A battery produced by the method for producing a battery according to claim 8.
CN202110823381.3A 2021-07-21 2021-07-21 Preparation method of positive pole piece, preparation method of battery, positive pole piece and battery Withdrawn CN113594418A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115117354A (en) * 2022-08-01 2022-09-27 合肥国轩高科动力能源有限公司 Suspension method glue solution preparation method, positive electrode paste, positive electrode plate and lithium ion battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115117354A (en) * 2022-08-01 2022-09-27 合肥国轩高科动力能源有限公司 Suspension method glue solution preparation method, positive electrode paste, positive electrode plate and lithium ion battery
CN115117354B (en) * 2022-08-01 2023-08-29 合肥国轩高科动力能源有限公司 Suspension method glue solution preparation method, positive electrode slurry, positive electrode plate and lithium ion battery

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