Lithium battery composite membrane and preparation method thereof

A composite diaphragm and lithium battery technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of occupying the internal space of the battery, increasing the weight and thickness of the diaphragm, and not conducive to improving the volumetric energy density of lithium-ion batteries. Realize the effects of lightweight battery, increased capacity per unit volume, and low cost

Inactive Publication Date: 2017-01-04
SHANGHAI SHUANGAO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the ceramic diaphragm can effectively improve the thermal stability of the diaphragm, it also significantly increases the weight and thickness of the diaphragm and occupies the internal space of the battery, which is not conducive to improving the volumetric energy density of the lithium-ion battery.

Method used

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  • Lithium battery composite membrane and preparation method thereof
  • Lithium battery composite membrane and preparation method thereof
  • Lithium battery composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method of a kind of lithium battery composite membrane that the present invention proposes comprises the following steps:

[0028] Step 1, preparation of nano-sol:

[0029] The nano sol is a mixture of one or more of silica sol, titanium sol, aluminum sol and zirconium sol, and its preparation steps are as follows:

[0030] Dissolving the compound of silicon, titanium, aluminum and zirconium which can be hydrolyzed in an organic solvent, adjusting the pH value to 2-4 or 8-10, adding high-purity water and hydrolyzing it to form a mixed solution A is obtained;

[0031] The compound of silicon, titanium, aluminum and zirconium that can be hydrolyzed is at least one of organic alcohol compounds, halides and organic esters, and can be divided into class A hydrolyzable compounds and class B hydrolyzable compounds; class A Hydrolyzable compounds include tetraethoxysilane, diethyl titanate, tetraisopropanol titanate, tetraethyl titanate, tetrabutyl titanate, ti...

Embodiment 1

[0042] Embodiment 1. Mix 20 g of tetraethoxysilane and 172 g of ethanol to form a uniform solution, add hydrochloric acid to adjust the pH value to 4, and slowly add high-purity water dropwise. The molar ratio of high-purity water to tetraethoxysilane was 8:1, stirred evenly, heated to reflux at 50° C. for 7 hours, and cooled to room temperature to obtain a nano-sol. During the experiment, a PE diaphragm with a thickness of 16 μm and a porosity of 60% was selected as the porous base film, and the nano-sol was coated on the PE diaphragm by dip-coating at a speed of 10 m / min, and dried at 15 °C. Dry.

Embodiment 2

[0043] Example 2 is basically the same as Example 1, the only difference is that in the preparation of nano-sol, tetraethoxysilane is replaced by tetraethyl titanate.

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Abstract

The invention discloses a lithium battery composite membrane which is formed by coating a porous base membrane with nano sol and then drying the sol. The lithium battery composite membrane has the following performances: the surface density is 10.04-12.70g/m<2>, the thickness is 15.3-16.6 microns, and the gas permeability is 140-696s/100cc. If the discharged membrane is put into an oven, the temperature is set to be 105 DEG C or 130 DEG C and the set temperature is kept for one hour, the thermal shrinkage rate is 2.5-3.5 105 DEG C/TD, 2.5-3.0 105 DEG C/MD and 3.3-10 130 DEG C/TD, and 3.5-8.5 130 DEG C/MD. The composite membrane consists of the porous base membrane and an inorganic material high-temperature coating coated between the surface and holes of the base membrane, has good thermal stability, good quality and less thickness increase, can be used for preparing high-energy density lithium batteries and also has the characteristics of simple preparation process, low cost and the like.

Description

technical field [0001] The invention relates to a battery composite diaphragm and a preparation method thereof, in particular to a lithium ion battery composite diaphragm and a preparation method thereof, and belongs to the technical field of lithium battery manufacturing. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy density, no self-discharge and no memory effect, and are widely used in various fields. At present, consumer electronics, energy storage and power vehicles have higher and higher energy density requirements for lithium-ion batteries, and higher energy density means higher requirements for battery safety performance. The development directions of consumer batteries mainly include: (1) higher safety; (2) larger capacity to support longer use time of electronic devices with greater power consumption; (3) lighter weight for easy portability; (4) Longer service life (cycle performance). [0003] The separator is on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14B82Y30/00
CPCB82Y30/00H01M50/403H01M50/411H01M50/431Y02E60/10
Inventor 鲁秀玲赵海玉范海平刘震球吴群伟
Owner SHANGHAI SHUANGAO ENERGY TECH
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