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Lithium ion battery diaphragm

A lithium-ion battery and separator technology, which is applied to the high-performance lithium-ion battery separator and its application and preparation fields, can solve the problems of blockage of membrane pores, insufficient stability of the separator, insufficient high temperature resistance, etc., and achieves strong and stable high temperature resistance. The effect of high stability and high ion mobility

Active Publication Date: 2020-01-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem that the present invention aims to solve is to provide a lithium-ion battery separator, especially to provide a high-performance lithium-ion battery separator modified with inorganic particles, its application, and its preparation method, aiming to solve the problem of lithium ion battery in the prior art. Insufficient stability of the battery separator, insufficient high temperature resistance, and the problem of membrane hole blockage caused by the addition of adhesives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Preparation of diaphragm

[0065] S1. Prepare a polypropylene base material with a thickness of 20 μm, and use a brush to roughen the base material;

[0066] S2, the first particle boehmite used for preparing the slurry, the first particle boehmite r=50nm and the second particle egg shell powder r'=10nm; 98 parts of boehmite are added to 0.2wt% polyvinyl alcohol (alcohol degree of hydrolysis: 99mol%, viscosity: 29mPa.s) dispersed in water, milled for 5 minutes to configure the first particle slurry for use; add 2 parts of egg shell powder to 0.8wt% polyvinyl alcohol (degree of alcoholysis: 99mol%, Viscosity: 29mPa.s) dispersed in water, ultrasonically dispersed for 5 minutes to prepare the second particle slurry for use;

[0067] S3, spraying the first particles on both sides of the substrate to form a first particle layer, and spraying the second particles in the gaps of the first particle layer to form a second particle layer;

[0068] S4, drying the base material a...

Embodiment 2

[0072] Preparation of diaphragm

[0073] S1. Prepare a polypropylene base material with a thickness of 40 μm, and use a brush to roughen the base material;

[0074] S2, modify the first particle boehmite, the first particle boehmite r=50nm and the second particle shell powder r'=10nm; 98 parts of boehmite are added to 0.2wt% polyvinyl alcohol (degree of alcoholysis: 99mol%, viscosity: 28mPa.s) dispersed in water, ball milled for 5min to configure the first particle slurry for use; add 0.8wt% polyvinyl alcohol (alcoholysis degree: 99mol%, viscosity: 29mPa. s) Disperse in water, disperse in water, and ultrasonically disperse for 5 minutes to prepare the second particle slurry for use;

[0075] S3, spraying the first particles on both sides of the substrate to form a first particle layer, and spraying the second particles in the gaps of the first particle layer to form a second particle layer;

[0076] S4, drying the base material and the first granular layer and the second gra...

Embodiment 3

[0080] Preparation of diaphragm

[0081] S1. Prepare a polypropylene base material with a thickness of 40 μm, and use a brush to roughen the base material;

[0082] S2, modify the first particle boehmite, the first particle boehmite r=50nm and the second particle polyethylene glycol particle r'=10nm; 98 parts of boehmite are added to 0.2wt% polyvinyl alcohol (alcohol degree of hydrolysis: 99mol%, viscosity: 28mPa.s) dispersed in water, milled for 5 minutes to configure the first particle slurry for use; add 2 parts of polyethylene glycol particles to 0.8wt% polyvinyl alcohol (degree of alcoholysis: 99mol %, viscosity: 29mPa.s) dispersed in water, dispersed in water, ultrasonically dispersed for 5 minutes to configure the second particle slurry for use;

[0083] S3, spraying the first particles on both sides of the substrate to form a first particle layer, and spraying the second particles in the gaps of the first particle layer to form a second particle layer;

[0084] S4, d...

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Abstract

The invention discloses a lithium ion battery diaphragm, which comprises a substrate and a modification layer. The lithium ion battery diaphragm is characterized in that the modification layer is an inorganic coating, wherein the inorganic coating is composed of a first particle layer and a second particle layer. The first particle layer has a first particle size r, and the second particle layer has a second particle size r', wherein the particle sizes r and r' meet the following relationship shown in the specification. The first particles are at least one or more of boehmite, aluminum oxide,titanium oxide, calcium oxide, zinc oxide, copper oxide and manganese oxide; and the second particles are natural organic particles, and the second particles are prepared from natural organic shells,wherein the natural organic shells are selected from eggshells and seashells. The first particle layer and the second particle layer are combined to form the integrated lithium battery diaphragm material, and the inorganic material does not fall off, so that compared with a traditional inorganic modified lithium ion battery diaphragm, the lithium ion battery diaphragm has the technical effects ofhigh stability and high high-temperature resistance.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm, in particular to a high-performance lithium-ion battery diaphragm modified by inorganic particles, its application and its preparation method. 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, which is used to separate the positive and negative electrodes, prevent the internal short circuit of the battery, allow lithium 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 imp...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/431H01M50/449Y02E60/10H01M50/446H01M50/451
Inventor 王海辉薛健王素清
Owner SOUTH CHINA UNIV OF TECH
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