CN113594537A - Safety battery and preparation method thereof - Google Patents

Safety battery and preparation method thereof Download PDF

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Publication number
CN113594537A
CN113594537A CN202110999541.XA CN202110999541A CN113594537A CN 113594537 A CN113594537 A CN 113594537A CN 202110999541 A CN202110999541 A CN 202110999541A CN 113594537 A CN113594537 A CN 113594537A
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Prior art keywords
coating
solid electrolyte
positive
active material
current collector
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Pending
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CN202110999541.XA
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Chinese (zh)
Inventor
周平来
戈志敏
王乾
宾术
张家华
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Huizhou Ganfeng Lithium Technology Co ltd
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Huizhou Ganfeng Lithium Technology Co ltd
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Priority to CN202110999541.XA priority Critical patent/CN113594537A/en
Publication of CN113594537A publication Critical patent/CN113594537A/en
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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
    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H01M50/451—Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a safety battery. The safety battery comprises a positive electrode, a negative electrode and a diaphragm, wherein the positive electrode comprises a positive current collector layer, a first solid electrolyte coating arranged on the surface of the positive current collector layer, a positive active material coating arranged on the surface of the first solid electrolyte coating, and a second solid electrolyte coating arranged on the positive active material coating. According to the safety battery, when the battery is subjected to mechanical abuse to cause internal short circuit, the solid electrolyte coating coated on the surface of the aluminum foil can effectively prevent the negative active material from directly contacting the aluminum foil; the diaphragm coated with the solid electrolyte can reduce the diaphragm shrinkage and prevent the short circuit point from expanding, and the solid electrolyte coating coated on the surface of the positive pole piece and the solid electrolyte coated with the positive active material can effectively reduce the thermal runaway risk during the short circuit in the battery and avoid the battery from being ignited and exploded. In addition, the invention also provides a preparation method of the safety battery.

Description

Safety battery and preparation method thereof
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a safety battery and a preparation method thereof.
Background
The lithium ion battery is one of the most important inventions in the 20 th century, and is widely applied to electronic equipment such as mobile phones, computers, intelligent wearable products, electric tools, models, unmanned aerial vehicles and the like, and is called as a consumer lithium ion battery. Lithium ion batteries are light in weight, rechargeable and strong in electric energy, and the quantity and the market scale of the lithium ion batteries are continuously enlarged, so that the lithium ion batteries also meet the rapid development opportunity.
Lithium ion energy density is higher and higher, and the safety problem also receives more and more attention, and when the short circuit in machinery abuse (acupuncture and heavy object impact etc.) production, the battery is inside can produce very big electric current and heat, can cause the thermal runaway problem of lithium cell, leads to the battery to catch fire and explode, directly threatens user safety.
The traditional lithium ion battery adopts liquid electrolyte which is flammable and explosive, and the growth of lithium dendrite is easy to puncture the diaphragm in the charging process, which causes short circuit of the battery and potential safety hazard. At present, the solid electrolyte is used for replacing the liquid electrolyte, which is an effective method for solving the safety problem of the lithium battery, and the solid electrolyte has the performances of incombustibility, no corrosion, no volatilization and no leakage, so that the all-solid battery has extremely high safety. The existing technology for improving the battery safety is inclined to all-solid batteries, but all-solid batteries have the problems of no wettability between solid and solid, high interface resistance and the like, and the all-solid batteries are immature in preparation process, basically do not have mass production conditions and are high in cost.
Disclosure of Invention
The invention provides a safety battery and a preparation method thereof, which are completed for solving the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a safety battery, includes positive pole, negative pole and diaphragm, the positive pole includes positive current collector layer, locates the first solid state electrolyte coating on positive current collector layer surface, locates the anodal active material coating on first solid state electrolyte coating surface, and locate the second solid state electrolyte coating of anodal active material coating, positive current collector layer is the aluminium foil, the negative pole includes negative current collector layer and locates the compound graphite coating of negative current collector layer both sides, negative current collector layer is the copper foil, the diaphragm includes base film and third solid state electrolyte coating, the base film is the individual layer PE, third solid state electrolyte coating locates at least one side of base film, the thickness of third solid state electrolyte coating is 0.5-10 mu m.
Further, the positive active material coating comprises a positive active material, a conductive agent, a binder and a solid electrolyte, the positive active material comprises at least one of a lithium cobaltate material, a ternary material and a high nickel material, and the positive active material accounts for 70-99% of the weight of the positive active material coating; the conductive agent comprises at least one of carbon black, carbon nanotubes and graphene, the conductive agent accounts for 1-10% of the weight of the positive active material coating, the adhesive accounts for 0-5% of the weight of the positive active material coating, the solid electrolyte is at least one of LLZO, LATP and LAG, and the solid electrolyte accounts for 1-20% of the weight of the positive active material coating.
Further, the first solid electrolyte coating is continuously coated on the surface of the positive electrode current collector layer, the second solid electrolyte coating is continuously coated on the surface of the positive electrode active material coating, and the thicknesses of the first solid electrolyte coating and the second solid electrolyte coating are 0.5-20 mu m.
Further, the diaphragm also comprises a glue coating layer, wherein the glue coating layer is positioned on at least one side of the base film, and the thickness of the glue coating layer is 0.5-10 μm.
Further, the glue coating layer is arranged on the side face, far away from the base film, of the third solid electrolyte coating layer.
Further, the third solid electrolyte coating is arranged on one side of the base film, and the third solid electrolyte coating and the glue coating are arranged on the other side of the base film.
Further, the third solid electrolyte is at least one of LLZO, LATP, and LAG.
A method of manufacturing a safety battery as described above, the method comprising the steps of:
the method comprises the following steps: carrying out double-sided continuous coating on a positive electrode current collector layer with a solid electrolyte LATP coating, controlling the thickness of a single layer to be 4 microns, drying at 100 ℃, weighing 0.94kg of lithium cobaltate, 0.014kg of carbon nanotube conductive agent, 0.016kg of PVDF and 0.03 kg of titanium aluminum lithium phosphate, adding the mixture into a stirring tank for mixing, uniformly stirring to obtain positive electrode slurry, uniformly coating the positive electrode slurry on the upper surface and the lower surface of a positive electrode current collector layer with the solid electrolyte coating, controlling the thickness to be within 50-130 microns, drying at 110 ℃, uniformly and continuously coating a solid electrolyte LATP solution on the upper surface and the lower surface of a positive electrode piece, wherein the thickness of the coating is 4 microns, drying at 80 ℃ to obtain a composite positive electrode piece, rolling the composite electrode piece, cleaning a second solid electrolyte coating at the position of a pole lug on the surface of the electrode piece by using a laser cleaning machine after striping, and obtaining the positive electrode piece;
step two: weighing 0.98kg of graphite, 0.006kg of styrene butadiene rubber binder and 0.014kg of sodium carboxymethylcellulose, adding the graphite, the styrene butadiene rubber binder and the sodium carboxymethylcellulose into a stirring tank, uniformly mixing and stirring to obtain negative electrode slurry, uniformly coating the negative electrode slurry on the upper surface and the lower surface of a carbon-coated copper foil, drying at 110 ℃, and rolling, slitting and tabletting to obtain a negative electrode piece;
step three: coating a third solid electrolyte coating on one side of a base film, wherein the thickness of the coating is 2 microns, drying at 80 ℃, coating a PVDF glue coating on the other side, wherein the thickness of the coating is 1 micron, and drying at 70 ℃ to obtain a composite diaphragm;
step four: winding the positive pole piece, the diaphragm and the negative pole piece into a bare cell, contacting the surface of the diaphragm coated with the solid electrolyte coating with the positive pole, contacting the side coated with the PVDF layer with the negative pole, packaging the bare cell in an aluminum plastic packaging bag, putting the aluminum plastic packaging bag into a vacuum drying oven, baking the aluminum plastic packaging bag at 80 ℃ in vacuum for 10 hours, injecting liquid, sealing the aluminum plastic packaging bag, standing the battery at high temperature for 48 hours, standing the battery at normal temperature for 24 hours, and then forming the battery by using a clamp.
According to the safety battery provided by the invention, when the battery is subjected to mechanical abuse to cause internal short circuit, the solid electrolyte coating coated on the surface of the aluminum foil can effectively prevent the negative active material from directly contacting the aluminum foil; the diaphragm coated with the solid electrolyte can reduce the diaphragm shrinkage and prevent the short circuit point from expanding, and the solid electrolyte coating coated on the surface of the positive pole piece and the solid electrolyte coated with the positive active material can effectively reduce the thermal runaway risk during the short circuit in the battery and avoid the battery from being ignited and exploded.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it should be obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a positive electrode of a safety battery according to the present invention;
fig. 2 is a schematic structural view of a separator of a safety battery according to the present invention.
The names corresponding to the reference numbers in the drawings are as follows:
the anode current collector comprises an anode current collector layer 1, a first solid electrolyte coating layer 2, an anode active material coating layer 3, a base film 4, a glue coating layer 5, a second solid electrolyte coating layer 6 and a third solid electrolyte coating layer 7.
Detailed Description
The following is a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Referring to fig. 1-2, the present invention provides a safety battery including a positive electrode, a negative electrode and a separator, the anode comprises an anode current collector layer 1, a first solid electrolyte coating 2 arranged on the surface of the anode current collector layer, and an anode active material coating 3 arranged on the surface of the first solid electrolyte coating, and a second solid electrolyte coating 6 provided on the positive active material coating, the positive current collector layer being an aluminum foil, the negative electrode comprises a negative current collector layer and composite graphite coatings arranged on two sides of the negative current collector layer, the negative current collector layer is copper foil, the diaphragm comprises a base film 4 and a third solid electrolyte coating 7, the basement membrane is single-layer PE, the third solid electrolyte coating is arranged on at least one side of the basement membrane, and the thickness of the third solid electrolyte coating is 0.5-10 mu m.
In one embodiment, the positive active material coating layer includes a positive active material, a conductive agent, a binder, and a solid electrolyte, the positive active material includes at least one of a lithium cobaltate material, a ternary material, and a high nickel material, and the positive active material accounts for 70-99% of the weight of the positive active material coating layer; the conductive agent comprises at least one of carbon black, carbon nanotubes and graphene, the conductive agent accounts for 1-10% of the weight of the positive active material coating, the adhesive accounts for 0-5% of the weight of the positive active material coating, the solid electrolyte is at least one of LLZO, LATP and LAG, and the solid electrolyte accounts for 1-20% of the weight of the positive active material coating.
In one embodiment, the first solid electrolyte coating layer is continuously coated on the surface of the positive electrode current collector layer, the second solid electrolyte coating layer is continuously coated on the surface of the positive electrode active material coating layer, and the thickness of the first solid electrolyte coating layer and the second solid electrolyte coating layer is 0.5-20 μm.
In one embodiment, the membrane further comprises a rubberized layer 5 located on at least one side of the base film, the rubberized layer having a thickness of 0.5-10 μm.
In one embodiment, the glue layer is provided on the side of the third solid-state electrolyte coating remote from the base film.
In one embodiment, the third solid electrolyte coating is provided on one side of the base film, and the third solid electrolyte coating and the glue coat are on the other side of the base film.
In one embodiment, the third solid state electrolyte is at least one of LLZO, LATP, and LAG.
Specifically, the surface of one side of the base membrane is provided with at least one solid electrolyte coating, or the surface of one side of the diaphragm base membrane is provided with at least one solid electrolyte coating, and the other side of the diaphragm base membrane is provided with at least one of a solid electrolyte layer or a glue coating (including but not limited to PVDF, PMMA, and the like) or a solid electrolyte layer plus a glue coating (including but not limited to PVDF, PMMA, and the like), or both sides of the diaphragm base membrane are provided with the solid electrolyte coatings and the glue coatings (including but not limited to PVDF, PMMA, and the like), and the coating thickness is 0.5-10 μm.
Specifically, the tab welding position on the positive pole piece is formed by cleaning the solid electrolyte coating on the surface of the pole piece in a laser cleaning or other modes.
The invention also provides a preparation method of the safety battery, which comprises the following steps:
the method comprises the following steps: carrying out double-sided continuous coating on a positive electrode current collector layer with a solid electrolyte LATP coating, controlling the thickness of a single layer to be 4 microns, drying at 100 ℃, weighing 0.94kg of lithium cobaltate, 0.014kg of carbon nanotube conductive agent, 0.016kg of PVDF and 0.03 kg of titanium aluminum lithium phosphate, adding the mixture into a stirring tank for mixing, uniformly stirring to obtain positive electrode slurry, uniformly coating the positive electrode slurry on the upper surface and the lower surface of a positive electrode current collector layer with the solid electrolyte coating, controlling the thickness to be within 50-130 microns, drying at 110 ℃, uniformly and continuously coating a solid electrolyte LATP solution on the upper surface and the lower surface of a positive electrode piece, wherein the thickness of the coating is 4 microns, drying at 80 ℃ to obtain a composite positive electrode piece, rolling the composite electrode piece, cleaning a second solid electrolyte coating at the position of a pole lug on the surface of the electrode piece by using a laser cleaning machine after striping, and obtaining the positive electrode piece;
step two: weighing 0.98kg of graphite, 0.006kg of styrene butadiene rubber binder and 0.014kg of sodium carboxymethylcellulose, adding the graphite, the styrene butadiene rubber binder and the sodium carboxymethylcellulose into a stirring tank, uniformly mixing and stirring to obtain negative electrode slurry, uniformly coating the negative electrode slurry on the upper surface and the lower surface of a carbon-coated copper foil, drying at 110 ℃, and rolling, slitting and tabletting to obtain a negative electrode piece;
step three: coating a third solid electrolyte coating on one side of a base film, wherein the thickness of the coating is 2 microns, drying at 80 ℃, coating a PVDF glue coating on the other side, wherein the thickness of the coating is 1 micron, and drying at 70 ℃ to obtain a composite diaphragm;
step four: winding the positive pole piece, the diaphragm and the negative pole piece into a bare cell, contacting the surface of the diaphragm coated with the solid electrolyte coating with the positive pole, contacting the side coated with the PVDF layer with the negative pole, packaging the bare cell in an aluminum plastic packaging bag, putting the packaging bag into a vacuum drying oven, vacuum-baking the packaging bag at 80 ℃ for 10 hours, injecting liquid, sealing the packaging bag, standing the battery at high temperature for 48 hours, standing the battery at normal temperature for 24 hours, and then carrying out fixture formation, molding, capacity grading and visual inspection.
According to the safety battery provided by the invention, when the battery is subjected to mechanical abuse to cause internal short circuit, the solid electrolyte coating coated on the surface of the aluminum foil can effectively prevent the negative active material from directly contacting the aluminum foil; the diaphragm coated with the solid electrolyte can reduce the contraction of the diaphragm and prevent the expansion of a short-circuit point; the solid electrolyte coating coated on the surface of the positive pole piece and the solid electrolyte coated by the positive active material can effectively reduce the thermal runaway risk during short circuit in the battery and avoid the battery from being ignited and exploded.
The above examples only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. A safety battery, characterized in that: including positive pole, negative pole and diaphragm, the positive pole includes positive current collector layer, locates the first solid state electrolyte coating on positive current collector layer surface, locates the anodal active material coating on first solid state electrolyte coating surface, and locate the second solid state electrolyte coating of anodal active material coating, positive current collector layer is the aluminium foil, the negative pole includes negative current collector layer and locates the compound graphite coating of negative current collector layer both sides, negative current collector layer is the copper foil, the diaphragm includes base film and third solid state electrolyte coating, the base film is individual layer PE, third solid state electrolyte coating locates at least one side of base film, the thickness of third solid state electrolyte coating is 0.5-10 mu m.
2. A safety battery according to claim 1, characterized in that: the positive active material coating comprises a positive active material, a conductive agent, a binder and a solid electrolyte, wherein the positive active material comprises at least one of a lithium cobaltate material, a ternary material and a nickelic material, and the positive active material accounts for 70-99% of the weight of the positive active material coating; the conductive agent comprises at least one of carbon black, carbon nanotubes and graphene, the conductive agent accounts for 1-10% of the weight of the positive active material coating, the adhesive accounts for 0-5% of the weight of the positive active material coating, the solid electrolyte is at least one of LLZO, LATP and LAG, and the solid electrolyte accounts for 1-20% of the weight of the positive active material coating.
3. A safety battery according to claim 2, characterized in that: the first solid electrolyte coating is continuously coated on the surface of the positive current collector layer, the second solid electrolyte coating is continuously coated on the surface of the positive active material coating, and the thicknesses of the first solid electrolyte coating and the second solid electrolyte coating are 0.5-20 mu m.
4. A safety battery according to claim 3, characterized in that: the diaphragm also comprises a glue coating layer, wherein the glue coating layer is positioned on at least one side of the base film, and the thickness of the glue coating layer is 0.5-10 mu m.
5. A safety battery according to claim 4, characterized in that: the glue coating layer is arranged on the side face, far away from the base film, of the third solid electrolyte coating layer.
6. A safety battery according to claim 5, characterized in that: the third solid electrolyte coating is arranged on one side of the base film, and the third solid electrolyte coating and the glue coating are positioned on the other side of the base film.
7. A safety battery according to claim 6, characterized in that: the third solid electrolyte is at least one of LLZO, LATP, and LAG.
8. A method for preparing the safety battery according to claims 1 to 7, comprising the steps of:
the method comprises the following steps: carrying out double-sided continuous coating on a positive electrode current collector layer with a solid electrolyte LATP coating, controlling the thickness of a single layer to be 4 microns, drying at 100 ℃, weighing 0.94kg of lithium cobaltate, 0.014kg of carbon nanotube conductive agent, 0.016kg of PVDF and 0.03 kg of titanium aluminum lithium phosphate, adding the mixture into a stirring tank for mixing, uniformly stirring to obtain positive electrode slurry, uniformly coating the positive electrode slurry on the upper surface and the lower surface of a positive electrode current collector layer with the solid electrolyte coating, controlling the thickness to be within 50-130 microns, drying at 110 ℃, uniformly and continuously coating a solid electrolyte LATP solution on the upper surface and the lower surface of a positive electrode piece, wherein the thickness of the coating is 4 microns, drying at 80 ℃ to obtain a composite positive electrode piece, rolling the composite electrode piece, cleaning a second solid electrolyte coating at the position of a pole lug on the surface of the electrode piece by using a laser cleaning machine after striping, and obtaining the positive electrode piece;
step two: weighing 0.98kg of graphite, 0.006kg of styrene butadiene rubber binder and 0.014kg of sodium carboxymethylcellulose, adding the graphite, the styrene butadiene rubber binder and the sodium carboxymethylcellulose into a stirring tank, uniformly mixing and stirring to obtain negative electrode slurry, uniformly coating the negative electrode slurry on the upper surface and the lower surface of a carbon-coated copper foil, drying at 110 ℃, and rolling, slitting and tabletting to obtain a negative electrode piece;
step three: coating a third solid electrolyte coating on one side of a base film, wherein the thickness of the coating is 2 microns, drying at 80 ℃, coating a PVDF glue coating on the other side, wherein the thickness of the coating is 1 micron, and drying at 70 ℃ to obtain a composite diaphragm;
step four: winding the positive pole piece, the diaphragm and the negative pole piece into a bare cell, contacting the surface of the diaphragm coated with the solid electrolyte coating with the positive pole, contacting the side coated with the PVDF layer with the negative pole, packaging the bare cell in an aluminum plastic packaging bag, putting the aluminum plastic packaging bag into a vacuum drying oven, baking the aluminum plastic packaging bag at 80 ℃ in vacuum for 10 hours, injecting liquid, sealing the aluminum plastic packaging bag, standing the battery at high temperature for 48 hours, standing the battery at normal temperature for 24 hours, and then forming the battery by using a clamp.
CN202110999541.XA 2021-08-29 2021-08-29 Safety battery and preparation method thereof Pending CN113594537A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114094053A (en) * 2021-11-05 2022-02-25 惠州锂威新能源科技有限公司 Tail aluminum foil processing method for improving safety test of lithium ion battery
CN117096281A (en) * 2023-10-12 2023-11-21 苏州清陶新能源科技有限公司 Composite electrode plate, preparation method thereof and lithium ion battery

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114094053A (en) * 2021-11-05 2022-02-25 惠州锂威新能源科技有限公司 Tail aluminum foil processing method for improving safety test of lithium ion battery
CN117096281A (en) * 2023-10-12 2023-11-21 苏州清陶新能源科技有限公司 Composite electrode plate, preparation method thereof and lithium ion battery
CN117096281B (en) * 2023-10-12 2024-01-30 苏州清陶新能源科技有限公司 Composite electrode plate, preparation method thereof and lithium ion battery

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