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High-safety polymer battery positive plate, polymer battery and battery preparation method

A battery positive electrode and polymer technology, which is applied in the manufacture of electrolyte batteries, electrode manufacture, battery electrodes, etc., can solve the problems of reducing the energy density of materials and being unable to effectively block the contact between the positive electrode active material and the aluminum foil, etc.

Pending Publication Date: 2020-11-10
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] People have been looking for ways to improve, such as coating the surface of the positive electrode active material, element doping, etc., but the surface of the positive electrode active material is coated with an inactive material with good thermal stability, so although in a certain To a certain extent, the thermal stability of the material is improved, but the energy density of the material will be reduced; at the same time, the surface of the positive active material material is covered with inactive materials, which still cannot effectively block the contact between the positive active material material and the aluminum foil.

Method used

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preparation example Construction

[0151] see figure 1 In order to prepare a high-safety polymer battery based on positive electrode protection provided by the present invention, the present invention also provides a method for preparing a high-safety polymer battery based on positive electrode protection, comprising the following steps:

[0152] The first step is to use a micro-gravure coating process (an existing mature process) to coat a layer of composite solid electrolyte coating on the outer surface of the aluminum foil (including the upper and lower sides and the front and rear sides);

[0153] The second step is to apply a layer of positive electrode active material coating on the composite solid electrolyte coating (specifically the outer surface) by using a roller coating or spraying process (an existing mature process) to obtain a positive electrode;

[0154] In the third step, the method of in situ initiating polymerization by free radicals (an existing mature process) is used to integrate the positiv...

Embodiment 1

[0204] The preparation method of a high-safety polymer battery based on positive electrode protection provided by the present invention adopts a micro-gravure coating process to coat a composite solid electrolyte coating on an aluminum foil; adopts a roller coating process to coat a solid electrolyte layer Positive electrode active material coating. In situ polymerization is initiated by free radicals, and a positive electrode, a preset polymer electrolyte, a negative electrode, and a support membrane are integrated to prepare a polymer battery. The specific steps of decomposition are as follows:

[0205] The first step, solid electrolyte slurry preparation: use LLZO, CNT, PAN / PVDF, 3-methacryloxypropylmethyldiethoxysilane, LITFSI, NMP, etc. to mix evenly to prepare solid electrolyte layer coating slurry material. The percentage by weight of solid raw materials for the coating slurry is distributed as follows: LLZO is 40%, PAN is 10%, PVDF is 10%, 3-methacryloyloxypropylmeth...

Embodiment 2

[0213] The preparation method of a high-safety polymer battery based on positive electrode protection provided by the present invention adopts a micro-gravure coating process to coat the composite solid electrolyte coating on the aluminum foil; adopts a spray coating process to coat the composite solid electrolyte coating Covered with positive electrode active material coating. Using free radicals to initiate polymerization in situ, the positive electrode, solid electrolyte, negative electrode and support membrane are integrated to prepare a polymer battery. Proceed as follows:

[0214] The first step, preparation of solid electrolyte slurry: use LATP, CNT, PMMA / PVDF, vinyl-terminated polydimethylsiloxane, LiFSI, NMP, etc. to mix uniformly to prepare a solid electrolyte layer coating slurry. The coating slurry solid raw material weight percent distribution is: LATP is 40%, PMMA is 10%, PVDF is 10%, vinyl-terminated polydimethylsiloxane 19.5%, azobisisobutyronitrile 0.5%, CNT ...

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Abstract

The invention discloses a high-safety polymer battery positive plate protected by a solid electrolyte coating. The high-safety polymer battery positive plate comprises an aluminum foil and double coating layers, wherein the aluminum foil serves as a positive current collector, and the outer surface of the aluminum foil is coated with double coating layers; the double-layer coating layer comprisesa composite solid electrolyte coating coated on the aluminum foil and a positive active material coating coated on the composite solid electrolyte coating; and the composite solid-state electrolyte coating comprises a first conductive agent and a composite solid-state electrolyte. In addition, the invention also discloses a high-safety polymer battery based on positive electrode protection, and apreparation method of the high-safety polymer battery based on positive electrode protection. According to the high-safety polymer battery positive plate, the polymer battery and the battery preparation method disclosed by the invention, the contact between the positive active material and the aluminum foil can be effectively blocked, the aluminothermic reaction when the polymer battery is in safety failure is prevented, the exothermic chain reaction of the battery is avoided, and the safety of the polymer battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-safety polymer battery positive electrode sheet, a polymer battery and a battery preparation method. Background technique [0002] With the improvement of the energy density of lithium-ion batteries, consumers have higher and higher requirements for their safety performance. Cathode materials with high energy density layered crystal structure, such as LiNi x co y mn z o 2 (NCM), LiCoO 2 It has attracted much attention and research by technicians. It is well known that the thermal stability of high-energy-density cathode materials during charging is a key factor affecting their application. [0003] For lithium-ion batteries, in the case of abuse, internal short circuit may occur, and the accumulation of Joule heat caused by internal short circuit will trigger exothermic reaction of materials such as negative electrode, positive electrode, electrolyte and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M10/42H01M10/0525H01M10/058
CPCH01M4/628H01M4/622H01M4/624H01M10/4235H01M4/0419H01M4/0435H01M10/0525H01M10/058H01M2004/028Y02E60/10Y02P70/50
Inventor 孟繁慧甄会娟朱莎高金辉周江伍绍中
Owner TIANJIN LISHEN BATTERY
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