Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof

A lithium battery diaphragm and power technology, applied in the field of coatings for power lithium battery diaphragms, can solve the problems of easy lint and powder loss of the diaphragm, increase in production costs, etc., and achieve enhanced coating leveling and water retention, improved liquid absorption, smooth surface effect

Active Publication Date: 2012-05-02
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating provided by Evonik Degussa’s patent is easy to shed hair and powder after coating the diaphragm; while the coating provided by Xiamen University’s patent has higher requirements on the substrate, resulting in an increase in production costs

Method used

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  • Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof
  • Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof
  • Coating for power lithium battery diaphragm, power lithium battery diaphragm and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Containing 10% chlorinated polyvinylidene fluoride, 15% glycerol, 2.5% sodium hypochlorite, 70% N,N-dimethylformamide, 2.5% nano silicon carbide whiskers (average diameter Preparation method of composite coating for power lithium battery separator with a diameter of 50nm and an aspect ratio of 50):

[0033] 1) Dissolve 10g of chlorinated polyvinylidene fluoride into a mixture of 15g of glycerol, 2.5g of sodium hypochlorite and 70g of N,N-dimethylformamide at a temperature of 80°C to form a viscous transparent liquid;

[0034] 2) Add 2.5 g of nano silicon carbide whiskers to the viscous transparent liquid prepared in 1), stir at high speed until it is completely homogenized and dispersed, that is, prepare 100 g of composite paint with a paint viscosity of 6350 mPa·s.

[0035] The preparation method of the power lithium battery separator (LSEP01): The MSEP separator in Comparative Example 1 is used as the wet-laid non-woven fabric substrate. The composite coating can be coat...

Embodiment 2

[0038] Containing 10% chlorinated polyvinylidene fluoride, 20% glycerol, 5% sodium hypochlorite, 60% N,N-dimethylformamide, 5% nano silicon carbide whiskers (average diameter Preparation method of composite coating for power lithium battery separator with a diameter of 80nm and an aspect ratio of 50):

[0039] 1) Dissolve 10g of chlorinated polyvinylidene fluoride into a mixture of 20g of glycerol, 5g of sodium hypochlorite and 60g of N,N-dimethylformamide at a temperature of 80°C to form a viscous transparent liquid;

[0040] 2) Add 5g of nano-silicon carbide whiskers to the viscous transparent liquid prepared in 1), stir at high speed until it is completely homogenized and dispersed, that is, prepare 100g of composite coating with a coating viscosity of 7320mPa·s.

[0041] The preparation method of the power lithium battery separator (LSEP02): The MSEP separator in Comparative Example 1 is used as the wet-laid non-woven fabric substrate, and the composite coating can be coated ...

Embodiment 3

[0044] Containing 15% chlorinated polyvinylidene fluoride, 20% glycerol, 2.5% sodium hypochlorite, 60% N,N-dimethylformamide, 2.5% nano silicon carbide whiskers (average diameter Preparation method of composite coating for power lithium battery separator with a diameter of 100nm and an aspect ratio of 30):

[0045] 1) Dissolve 15g of chlorinated polyvinylidene fluoride into a mixture of 20g of glycerol, 2.5g of sodium hypochlorite and 60g of N,N-dimethylformamide at a temperature of 80°C to form a viscous transparent liquid;

[0046] 2) Add 2.5g of nano-silicon carbide whiskers to the viscous transparent liquid prepared in 1), stir at high speed until it is completely homogenized and dispersed, that is, prepare 100g of composite coating with a coating viscosity of 6410mPa·s.

[0047] The preparation method of the power lithium battery separator (LSEP03): The MSEP separator in Comparative Example 1 is used as the wet-laid non-woven fabric substrate. The composite coating can be co...

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Abstract

The invention provides a coating for a power lithium battery diaphragm, a power lithium battery diaphragm and preparation thereof. The coating for the power lithium battery diaphragm which takes wet nonwoven cloth as a base material is characterized by comprising 5-20% (wt) chlorinated polyvinylidene fluoride, 10-20% (wt) glycerol, 60-80% (wt) N, N-dimethylformamide, 2.5-5% (wt) sodium hypochlorite and 2.5-5% (wt) nano-silicon carbide whiskers. A method for preparing the coating for the power lithium battery diaphragm which takes the wet nonwoven cloth as the base material is characterized bycomprising the following specific steps of: proportionally dissolving chlorinated polyvinylidene fluoride in the mixed solution of glycerol, sodium hypochlorite and N, N-dimethylformamide to form thick transparent fluid; adding the nano-silicon carbide whiskers to the thick transparent fluid and stirring the same until the whiskers are completely homogenized and dispersed, thereby obtaining the coating for the power lithium battery diaphragm which takes the wet nonwoven cloth as the base material. The coating is capable of obviously improving the absorbency, electrical properties, high temperature shrinkage resistance and tensile strength of the power lithium battery diaphragm.

Description

Technical field [0001] The invention relates to a paint for a power lithium battery diaphragm, a power lithium battery diaphragm and preparation thereof, and belongs to the technical field of lithium batteries. Background technique [0002] The power lithium battery is composed of positive / negative electrode materials, electrolyte, diaphragm and battery casing packaging materials. The separator plays a role in preventing the positive / negative short circuit in the battery, and at the same time provides the ion transport channel during the charge and discharge process. Its performance determines the battery's interface structure, internal resistance, etc., and directly affects the battery's capacity, cycle performance and safety performance And other characteristics, excellent performance separators play an important role in improving the overall performance of the battery. At present, the materials for power lithium battery separators mainly include polyolefin microporous membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/256D06M11/77H01M2/16D06M101/32D06M101/02
CPCY02E60/12Y02E60/10
Inventor 贺磊吴立群杨娇
Owner CHINA HAISUM ENG
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