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Lithium-ion battery diaphragm, lithium ion battery and preparation method thereof

A lithium-ion battery and diaphragm technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of inability to absorb batteries, poor high-temperature resistance of lithium-ion batteries, etc., and achieve easy winding, high temperature Excellent mechanical strength and high ionic conductivity

Active Publication Date: 2018-03-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing lithium-ion battery separators can be formed from polymer materials by humidity phase inversion method, however, because the melting temperature of polymer materials is usually low (400-500 °C), the high temperature resistance of lithium-ion batteries may be poor, and Polymer materials cannot absorb impurities such as side reaction products generated in batteries

Method used

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  • Lithium-ion battery diaphragm, lithium ion battery and preparation method thereof
  • Lithium-ion battery diaphragm, lithium ion battery and preparation method thereof
  • Lithium-ion battery diaphragm, lithium ion battery and preparation method thereof

Examples

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Embodiment approach

[0047] The acrylate cross-linked polymer refers to a polymer obtained by cross-linking polymerization of reactive acrylate monomers. The crosslinking degree of the acrylate crosslinked polymer may be 2-30%, preferably 5-20%. In the present invention, the degree of crosslinking refers to the percentage of the weight of the crosslinked polymer to the total weight of the polymer. In addition, the glass transition temperature of the acrylate crosslinked polymer is preferably -20°C to 60°C, more preferably -12°C to 54°C. According to a preferred embodiment of the present invention, the acrylate crosslinked polymer is the second acrylate crosslinked polymer, the third acrylate crosslinked polymer, or the first acrylate crosslinked polymer A mixture with a second acrylate crosspolymer and / or a third acrylate crosspolymer; wherein the first acrylate crosspolymer contains 70-80% by weight of polymethyl methacrylate ester segment, 2-10% by weight of polyethyl acrylate segment, 10-20% ...

Embodiment 1

[0139] Example 1 (lithium-ion battery diaphragm of heat-resistant layer-porous base film (ceramic diaphragm)-heat-resistant layer three-layer structure)

[0140] This embodiment is used to illustrate the lithium-ion battery separator provided by the present invention and its preparation method.

[0141] (1) Preparation of ceramic diaphragm:

[0142] 2kg Al 2 o 3Particles (average particle diameter is 400nm), 0.01kg sodium polyacrylate (number average molecular weight is 9000, purchased from Guangzhou Yuanchang Trading Co., Ltd.), 0.024kg sodium carboxymethylcellulose (1% by weight aqueous solution viscosity is 2500-3000mPa s, purchased from Xinxiang Heluolida Power Supply Materials Co., Ltd., brand name BTT-3000) mixed with water evenly, so that Al 2 o 3 The solid content is the mixture of 30% by weight, the mixture was stirred at 6000rpm for 1.5 hours, then added 0.02kg of 3-glycidyl etheroxypropyl trimethoxysilane and continued to stir for 1.5 hours, then added 0.1kg pol...

Embodiment 2

[0146] Example 2 (porous base film (ceramic diaphragm)-lithium-ion battery diaphragm of heat-resistant layer two-layer structure)

[0147] This embodiment is used to illustrate the lithium-ion battery separator provided by the present invention and its preparation method.

[0148] (1) Preparation of ceramic diaphragm:

[0149] 2kg boehmite (average particle diameter is 300nm), 0.016kg sodium polyacrylate (number average molecular weight is 9000, purchased from Guangzhou Yuanchang Trading Co., Ltd.), 0.014kg carboxymethyl nanocellulose sodium (1% by weight aqueous solution Viscosity is 2500-3000mPaS, purchased from Xinxiang Heluolida Power Material Co., Ltd., the brand is BTT-3000) and water are mixed uniformly, so that the solid content of boehmite is a mixture of 50% by weight, and the mixture is heated at 8000rpm Stir for 1.5 hours, then add 0.01kg of 3-glycidyl etheroxypropyl trimethoxysilane and continue to stir for 1.5 hours, then add 0.12kg of polyacrylate binder (cross...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a lithium-ion battery diaphragm, a lithium ion battery and a preparation method thereof. The lithium-ion battery diaphragm comprises a porous base membrane and a heat-resistant layer which covers at least one side surface of the porous base membrane; the heat-resistant layer contains a high-temperature polymer and a nano-material, wherein the high-temperature polymer and the nano-material are in the weight ratio of (99 to 1) to (3 to 7); the heat-resistant layer is of a porous structure, the average pore diameter is 10to 1,000 nm, and the porosity is 30 to 60 percent. The lithium-ion battery diaphragm provided by the invention has high ionic conductivity, and also has high heat resistance and high mechanical strength at a high temperature.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery diaphragm, a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly composed of positive / negative electrode materials, electrolytes, separators and battery casing packaging materials. The separator is an important part of the lithium-ion battery. It is used to separate the positive and negative electrodes, prevent the internal short circuit of the battery, allow the electrolyte ions to pass freely, and complete the electrochemical charge and discharge process. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the rate performance, cycle performance, and safety performance (high temperature resistance) of the battery. A separator with excellent performance plays an important role in improving the overall performanc...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/058H01M10/0587H01M50/403H01M50/414H01M50/417H01M50/426
CPCH01M10/0525H01M10/058H01M10/0587H01M50/431H01M50/44H01M50/403H01M50/411H01M50/449Y02E60/10Y02P70/50
Inventor 胡家玲单军何龙
Owner BYD CO LTD
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