Ceramic and polymer composite coated lithium ion diaphragm and preparation method thereof

A polymer coating and polymer technology, applied in electrical components, electrochemical generators, circuits, etc., can solve problems such as poor heat resistance, achieve good heat resistance, improve bond strength, and excellent electrochemical performance Effect

Active Publication Date: 2017-10-20
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the PVDF-coated lithium battery diaphragm prepared by the Chinese patent publication number CN 105552277 A can improve the bonding strength between the diaphragm and the pole piece, it has poor heat resistance, especially when electric vehicles have high requirements on the safety of power batteries. Difficult to meet requirements

Method used

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  • Ceramic and polymer composite coated lithium ion diaphragm and preparation method thereof
  • Ceramic and polymer composite coated lithium ion diaphragm and preparation method thereof
  • Ceramic and polymer composite coated lithium ion diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of water-based binder emulsion:

[0044] ① Take 5 parts of sodium carboxymethyl cellulose, add it to deionized water 8 times its weight, and stir evenly;

[0045] ② Take 1.5 parts of barium titanate powder, 0.5 parts of sodium dodecylbenzenesulfonate, and the above-mentioned sodium carboxymethylcellulose dissolved in water, add to deionized water 6 times its weight, stir and disperse at a high speed of 2500 R / min for 60 minutes, and obtain A solution;

[0046] ③Take 8 parts of butyl acrylate, 8 parts of methyl methacrylate, 0.2 parts of Triton X-100, and 0.2 parts of sodium dodecylbenzenesulfonate, add them to deionized water 16 times their weight, stir and disperse Uniformly, obtain B solution;

[0047] ④Raise the temperature of solution A in the reaction kettle to 80°C, add 0.25 parts of ammonium persulfate, pass in protective gas, add solution B dropwise to solution A under stirring, complete the dropwise addition within 30 minutes, keep stirring fo...

Embodiment 2

[0055] (1) Preparation of water-based binder emulsion:

[0056] ① Add 8 parts of sodium carboxymethyl cellulose to deionized water 10 times its weight, and stir evenly;

[0057] ② Dissolve 2.5 parts of rutile titanium dioxide, 0.35 parts of sodium lauryl sulfate, and the above-mentioned sodium carboxymethyl cellulose in water, add it to deionized water 5 times its weight, stir and disperse at a high speed of 2500 R / min for 55 minutes, and obtain A solution;

[0058] ③ Take 6 parts of butyl acrylate, 7 parts of ethyl acrylate, 4.5 parts of acrylic acid, 0.25 parts of sodium dodecyl sulfate, and 0.25 parts of sodium dodecylbenzenesulfonate, add them to deionized water 14 times their weight, and stir Disperse evenly to obtain B solution;

[0059] ④Raise the temperature of solution A in the reaction kettle to 75°C, add 0.35 parts of ammonium persulfate, pass in protective gas, add solution B dropwise to solution A under stirring, complete the dropwise addition within 30 minutes, ...

Embodiment 3

[0067] (1) Preparation of water-based binder emulsion:

[0068] ① Take 10 parts of sodium carboxymethyl cellulose, add it to deionized water 18 times its weight, and stir evenly;

[0069] ② Take 3.8 parts of rutile titanium dioxide, Triton X-100: 0.15 parts, and the above sodium carboxymethylcellulose dissolved in water, add it to deionized water 13 times its weight, stir and disperse at a high speed of 3300 R / min for 35 minutes, and obtain A solution;

[0070] ③Take 5 parts of butyl acrylate, 5 parts of ethyl acrylate, 8 parts of methyl methacrylate, 0.2 parts of sodium benzenesulfonate X-100, 0.3 parts of sodium dodecylbenzenesulfonate, add to 10 times its weight in deionized water, stir and disperse evenly to obtain B solution;

[0071] ④Raise the temperature of solution A in the reactor to 60°C, add 0.35 parts of ammonium persulfate, pass in protective gas, add solution B dropwise to solution A under stirring, complete the dropwise addition within 37 minutes, keep stirrin...

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Abstract

The invention discloses a ceramic and polymer composite coated lithium ion diaphragm and a preparation method thereof. The ceramic and polymer composite coated lithium ion diaphragm comprises a polyolefin porous diaphragm, a ceramic coating coated on one side or the two sides of the diaphragm surface and a polymer coating coated on the ceramic surface or the diaphragm surface. The composite diaphragm prepared by the preparation method disclosed by the invention has the advantages that the heat resistance of the diaphragm is greatly improved, and the infiltration of an electrolyte is improved; the bonding strength of the diaphragm and a positive and negative pole piece is improved, so that the internal short-circuit caused by staggering between the diaphragm and an electrode is prevented; meanwhile, the hardness of a battery is improved, so that the safety performance of the battery is greatly improved. In the production process, the ceramic coating and the polymer coating are uniform in thickness and good in uniformity and facilitate continuous and large-scale production.

Description

technical field [0001] The invention relates to a lithium-ion battery separator, in particular to a ceramic-polymer composite lithium battery separator with high safety performance, strong bonding force between the separator and a pole piece, and capable of large-scale production and a preparation method thereof. Background technique [0002] With the blowout development of electric vehicles in recent years, the market size of power batteries is also rising sharply, but at the same time, the safety of power batteries has also become the focus of attention. According to incomplete statistics, in the first half of 2016 alone, a total of 11 fire accidents occurred in electric vehicles, one of which was caused by a short circuit of the battery. In order to eliminate the potential safety hazards of power batteries, it has become a consensus in the industry to improve the safety performance of power batteries. [0003] As one of the four major materials of lithium batteries, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/42H01M50/403H01M50/417H01M50/434H01M50/451H01M50/457H01M50/489H01M50/491
CPCH01M10/4235H01M50/403H01M50/451H01M50/491H01M50/489H01M50/417H01M50/434H01M50/457H01M10/0525Y02E60/10
Inventor 廖培龙平翔姚勇强张柳浩陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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