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Method for preparing lithium battery power diaphragm

A lithium battery and power technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of hidden safety concerns, easy shrinkage of the diaphragm, and low porosity, and achieve the effect of improving safety

Inactive Publication Date: 2018-11-13
名添科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of diaphragm is not suitable for lithium-ion power batteries because of the limited heat resistance of its own matrix. Because of its poor heat resistance, the diaphragm is easy to shrink and cause a short circuit in the battery. At the same time, there are also great hidden concerns in terms of safety.
[0003] Disadvantages of the current polyolefin separators: poor temperature resistance (the diaphragm starts to shrink at about 95 degrees), low porosity, which hinders the migration of ions, takes too long to absorb electrolyte, and has low temperature resistance. When the battery is baked The temperature is low, and it takes a long time to dry the water, which seriously affects the production efficiency and wastes a lot of resources; at the same time, due to the limitation of the polyolefin material manufacturing process, when this type of diaphragm is punctured by a hard object, the damage caused is irreversible of

Method used

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  • Method for preparing lithium battery power diaphragm
  • Method for preparing lithium battery power diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A preparation method of a lithium battery power diaphragm, comprising the following steps:

[0029] 1) Preparation of synthetic cotton film: The synthetic cotton film contains the following components: 0.1D staple fiber 40~55%, ether 25~35%, acetone 3~5%, glacial acetic acid 4~7%, methylcellulose 0.3~0.5% %, ethanol 1~2%, oil 1~2%, toluene 1~2%, resin 2~3%, the balance is diluent;

[0030] 2) Preparation of polyolefin microporous film: using polyolefin resin, nucleating agent and solvent as raw materials, and using the mass ratio as polyolefin resin: nucleating agent: solvent = 1000-2000: 20-50: 2000-3000 to prepare a polyolefin film. Olefin solution; then extruded into polyolefin solution and gel sheet, stretched, film-forming solvent to remove surface impurities, dried, heat-treated and shaped to obtain polyolefin microporous membrane;

[0031] 3) Synthetic ceramic diaphragm: One or more of the synthetic cotton film and the polyolefin microporous film with a specific...

Embodiment 2

[0033] Using 6 grams of synthetic cotton film cloth and 4 grams of polyolefin microporous film to composite a ceramic diaphragm by wet process, the ceramic diaphragm is used in the production of new lithium-ion power batteries. To test the new lithium-ion power battery produced.

[0034] The test results are: the ionic conductivity is higher than 10-3 S / cm, the pore size is 195nm, the film thickness is 15μm, the film air permeability is 130s / 100ml, the shrinkage rate is less than 1% at 200°C, and the shrinkage rate is 0 at 180°C.

Embodiment 3

[0036] Using 6 grams, 10 grams, 20 grams of synthetic cotton film cloth and 4 grams, 20 grams, 15 grams of polyolefin microporous membranes are composited by wet process to make ceramic diaphragms, which are used in new lithium-ion power batteries. Production. To test the new lithium-ion power battery produced.

[0037] The test results are: the ionic conductivity is higher than 10-3 S / cm, the pore size is 130nm, the film thickness is 60μm, the film air permeability is 190s / 100ml, the shrinkage rate at 200°C is less than 1%, and the shrinkage rate at 180°C is 0.

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Abstract

The invention provides a method for preparing a lithium battery power diaphragm. The method comprises the following steps: 1) preparing synthetic cotton film cloth; 2) preparing a polyolefin micro-pore film; 3) synthesizing a ceramic diaphragm. By adopting the ceramic diaphragm prepared by using the method, the purposes that good thermal resistance, that is, the diaphragm is not shrunk at a temperature less than 180 DEG C, is achieved, and the shrinkage is 1% at 200 DEG C, the diaphragm is good in puncturing and low in shrinkage, the battery baking time and efficiency are improved because of rapid electrolyte absorption speeds and quantities, and the security is improved, are achieved; meanwhile, strength requirements of the diaphragm are met, the strength of the micro-pore film is utilized after the diaphragm is used, and the product can be applied to a wider range.

Description

technical field [0001] The invention belongs to the lithium ion battery diaphragm technology, and particularly relates to a preparation method of a lithium battery power diaphragm. Background technique [0002] The lithium-ion battery separators currently used in the market are mostly polyethylene, polypropylene, single-layer or multi-layer and ceramic coating. This type of separator is not suitable for lithium-ion power batteries because its own matrix limits the heat resistance. Because of its poor heat resistance, the separator is easily contracted and the battery is short-circuited. At the same time, there are also great safety concerns. [0003] Disadvantages of the current polyolefin diaphragm: poor temperature resistance (the diaphragm begins to shrink at about 95 degrees), low porosity, which hinders the migration of ions, takes too long to absorb the electrolyte, and has low temperature resistance, when the battery is baked The temperature is low, and it takes a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/431Y02E60/10
Inventor 黄博然
Owner 名添科技(深圳)有限公司
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