A lithium ion battery isolation film and a preparation method thereof

A lithium-ion battery and separator technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve problems such as high bonding strength and low swelling, and achieve good air permeability , The effect of improving safety performance and battery cycle performance

Inactive Publication Date: 2018-12-18
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0011] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a lithium-ion battery separator and a preparation method thereof, which is used to solve the problem that the lithium-ion battery separator in the prior art cannot simultaneously achieve high bonding strength and low bonding strength. The swelling problem

Method used

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  • A lithium ion battery isolation film and a preparation method thereof
  • A lithium ion battery isolation film and a preparation method thereof
  • A lithium ion battery isolation film and a preparation method thereof

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preparation example Construction

[0066] Such as Figure 8 As shown, the present invention also provides a preparation method of a lithium-ion battery separator, using the preparation method, the above-mentioned lithium-ion battery separator can be prepared, and the preparation method includes:

[0067] S1. Mix the polymer, solvent and additives uniformly to obtain a polymer slurry. The polymer material includes polyacrylic acid, polymethacrylic acid, polymethyl acrylate, polyethyl acrylate, polyacrylic acid-styrene copolymer materials, neopentyl glycol diacrylate, polytetrafluoroethylene, polyimide, polyamides, polyesters, polysulfones, polyacrylonitrile at least one of the group consisting of the polymer pulp The total weight of the material is 100 parts, the weight of the polymer is between 10 and 85 parts, the weight of the solvent is between 10 and 85 parts, and the weight of the auxiliary agent is between 0.01 and 10 parts between;

[0068] S2, providing a porous substrate, coating the polymer slurry o...

Embodiment 2

[0096] The polymer slurry was coated on one side of the same PE porous base film as in Comparative Example 1 by gravure coating, and finally baked in an oven to form a thickness of the polymer coating of 0.5 μm. A lithium-ion battery separator formed by a high-viscosity low-swell polymer coating and a PE porous base film can be prepared, with a total thickness of 11.5 μm.

Embodiment 3

[0104] The polymer slurry was coated on both sides of the same porous substrate as in Comparative Example 2 by gravure coating, and finally the thickness of the polymer coating formed by oven baking was 0.5 μm , Lithium-ion battery separator formed by high-viscosity and high-swell polymer coating and PE microporous base film, with a total thickness of 13 μm.

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Abstract

The invention provides a lithium ion battery isolation film, which includes a porous substrate and a polymer coating coated on at least one side surface of the porous substrate; and the material of the polymer includes at least one of polyacrylic acid, polymethacrylic acid, polymethyl acrylate, styrene copolymer, neopentyl glycol diacrylate, polytetrafluoroethylene, polyimide, polyamide, polyester, polysulfone and polyacrylonitrile. The polymer has good bonding performance, the prepared polymer coating prepared by the invention is thin in thickness, uniform and continuous in distribution, andthe adhesion among the porous substrate, the inorganic coating and the positive and negative electrode sheets can be improved, thereby improving the hardness of the battery cell. In addition, the polymer particles have a large number of micro-pores between them, and the polymer particles swelling in the electrolyte is small, which can ensure that the obtained isolation film has good air permeability and battery cyclicity.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. In the lithium-ion battery structure, the separator is one of the key inner components. Lithium-ion battery separator is one of the key materials of lithium-ion batteries. It is a material that connects and separates the positive and negative electrodes of the battery. It is an electronic insulator that can prevent short circuits, but allows lithium ions to pass through. The function of closed cells is to block the conduction of electric current in the battery. At present, with the wide application of power vehicles in daily life, due to the emergence of a large number of series-parallel battery packs, the safety performance of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M2/14H01M50/403H01M50/414H01M50/449
CPCH01M50/403H01M50/463H01M50/411Y02E60/10
Inventor 程跃周博建苏晓明
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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