A method for preparing a lithium battery coated diaphragm by blending an organic clay minerals and polyvinylidene fluoride

A polyvinylidene fluoride and organoclay technology, which is used in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of complex process, high cost, poor compatibility between coating and base film, etc.

Active Publication Date: 2018-12-18
中科(淮安)新能源技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing a lithium battery coating diaphragm by blending organoclay minerals and PVDF, so as to solve the problems of high cost, complex process, brittleness, and poor compatibility between the coating and the base film of the current ceramic coating film. to improve the conductivity, cycle stability and safety of lithium battery separators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Attapulgite is purified by wet method (purity not less than 50%), dried and pulverized through a 200-mesh sieve, and the dried soil is added with dimethyl diallyl ammonium chloride to react in a water system. The mass fraction of dimethyl diallyl ammonium chloride is 3%, the mass fraction of dimethyl diallyl ammonium chloride is 3%, the reaction is stirred at 50rpm at 90°C and refluxed for 1h, then filtered, vacuum-dried at 80°C, ground, and passed through a 200-mesh sieve to prepare Obtain organically modified attapulgite;

[0027] 1g of the above-mentioned organic attapulgite and 24g of 200-mesh PVDF with a purity of 99.5% were added to 85g of electronic grade NMP, stirred at room temperature for 1 h, and mixed to form a uniform slurry. Coated on the PP base film at a speed of 50mm / s in the state, and controlled the thickness of the final double-sided coating film to 1μm, air-dried for 25min, immersed in a water tank for 24h, and vacuum-dried at 80°C to obtain a lithi...

Embodiment 2

[0029] After halloysite is purified by wet method (purity not less than 50%), directly add methacryloyloxyethyltrimethylammonium chloride and cetylpyridinium bromide to the slurry to react in the water system, angstrom The mass fraction of rock stone is 10%, the mass fraction of methacryloyloxyethyltrimethylammonium chloride and cetylpyridinium bromide is 5%, and the reaction is stirred at 100 rpm at 60°C and refluxed for 4h, and then filtered, Freeze vacuum drying, grinding, and passing through a 200-mesh sieve to obtain organically modified halloysite;

[0030] 10g of the above-mentioned organic halloysite and 20g of 400-mesh PVDF with a purity of 99.8% were added to 70g of electronic grade DMAc, stirred at room temperature for 10 h, and mixed to form a uniform slurry. Coated on the PE base film at a speed of 60mm / s in the state, and controlled the thickness of the final single-sided coating film to 15 μm, air-dried for 15 minutes, immersed in a water tank for 1 hour, and va...

Embodiment 3

[0032] Bentonite is purified by wet method (purity not less than 50%), dried and pulverized through a 200-mesh sieve, and the dried mixed minerals are added with organic modifiers to react in a water system. The mass fraction of bentonite is 15%, organic The mass fraction of modifier octadecyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, tetradecyl trimethyl ammonium chloride, dodecyl trimethyl ammonium chloride 2.5%, stirred at 200rpm at 60°C and refluxed for 6h, then filtered, vacuum-dried at 40°C, ground, and passed through a 200-mesh sieve to obtain organically modified bentonite;

[0033] 20g of the above-mentioned organically modified bentonite and 5g of 800-mesh PVDF with a purity of 99.5% were added to 75g of electronic grade DMF, stirred at room temperature for 20h, and mixed to form a uniform slurry. Coat it on the PP / PE composite base film at a speed of 50mm / s, control the thickness of the final coating film on one side to be 10μm, air-dry for 5 m...

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Abstract

The invention provides a method for preparing a lithium battery coated diaphragm by blending organic clay minerals and polyvinylidene fluoride, and is characterized in that the preparation method comprises the following steps: S1, adding organic clay minerals and polyvinylidene fluoride into a solvent, stirring the organic clay minerals and the polyvinylidene fluoride, and making the organic clayminerals and the polyvinylidene fluoride be mixed into a uniform slurry at normal temperature; S2, coating the homogeneous slurry mixed in the step S1 on the base film under normal temperature and vacuum state to form a coating layer, and then air-drying the base film with the coating layer, performing standing and cleaning, and performing vacuum-drying after the cleaning to obtain a lithium battery coated diaphragm. The mineral clay is used for preparing a lithium ion battery diaphragm after the organification modification, the conductivity of the base film is improved, the compatibility of the coating film and the base film is enhanced, and the thermal stability and the mechanical strength of the diaphragm are improved.

Description

technical field [0001] The invention relates to the field of lithium battery diaphragm preparation, in particular to a method for preparing a coating film which is blended with organoclay minerals and polyvinylidene fluoride (PVDF), dissolved in a solvent and coated on a PP / PE base film. Background technique [0002] Lithium-ion battery is the most commonly used portable energy storage device. With the rapid development of new energy vehicles in recent years, lithium-ion battery is recognized as the most promising power battery at this stage. However, the core issue for lithium-ion batteries to expand from the field of portable electrical power supplies to power batteries is how to ensure safety performance at high energy density and at low cost. [0003] The main function of the lithium battery separator is to isolate the positive and negative electrodes to prevent direct contact between the positive and negative electrodes, causing combustion or even explosion. In addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/411
CPCH01M10/052H01M50/403H01M50/409Y02E60/10
Inventor 陈新德熊莲
Owner 中科(淮安)新能源技术开发有限公司
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