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Preparation of high-safety ceramic-coated separator and application of ceramic-coated separator in lithium ion battery

A technology of lithium-ion batteries and ceramic diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of limited thermal stability of ceramic diaphragms, aggravated heat accumulation, high battery pressure, etc., to improve strength and thermal stability performance, improve security performance, and improve the effect of interface performance

Active Publication Date: 2017-11-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the thermal stability of existing ceramic diaphragms is still very limited. For example, ceramic diaphragms based on PE will have a large volume shrinkage and pulverization at temperatures above 160°C.
In turn, it will cause a large area of ​​short circuit in the battery and cause thermal runaway, aggravate the accumulation of heat, generate high pressure inside the battery, and cause the battery to burn or explode

Method used

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  • Preparation of high-safety ceramic-coated separator and application of ceramic-coated separator in lithium ion battery
  • Preparation of high-safety ceramic-coated separator and application of ceramic-coated separator in lithium ion battery
  • Preparation of high-safety ceramic-coated separator and application of ceramic-coated separator in lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0045] Put 1g of alumina nanoparticles, lignin, sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) in a mass ratio of 75:20:2:3 into deionized water and ethanol (1: 1, volume ratio) mixed solution 10ml, mix evenly, the obtained slurry is evenly coated on the monolayer surface of commercial polyethylene (PE) separator. Dry to remove the solvent to obtain a modified ceramic diaphragm.

Embodiment 2

[0051] Silica nanoparticles, sodium lignosulfonate, sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) with a mass ratio of 80: 15: 2: 3 mixed powder 1g, put into deionized water and Propanol (1:2, volume ratio) mixed solution 10ml, mixed evenly, and the obtained slurry was uniformly coated on the surface of a single layer of commercial polypropylene (PP) separator. Dry to remove the solvent to obtain a modified ceramic diaphragm.

Embodiment 3

[0054] Put titanium dioxide nanoparticles, calcium lignosulfonate, and polyacrylate terpolymer latex (LA132, LA133) in a mass ratio of 70:25:3:2 into 1g of mixed powder, put it into deionized water and acetone (2: 1, volume ratio) mixed solution 10ml, mix evenly, the obtained slurry is evenly coated on the double-layer surface of commercial polyethylene (PE) diaphragm. Dry to remove the solvent to obtain a modified ceramic diaphragm.

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Abstract

The invention discloses preparation of a high-safety ceramic-coated separator and an application of the ceramic-coated separator in a lithium ion battery, and relates to a lithium ion battery. The preparation comprises the steps of uniformly mixing a nano ceramic particle, lignin, a lignin derivative, a water-base binding agent and a water-base solvent to obtain ceramic slurry, coating the ceramic slurry on the surface of a microporous separator, performing vacuum drying, and removing the solvent to obtain a modified ceramic-coated separator, namely the high-safety ceramic-coated separator. The high-safety ceramic-coated separator can be applied in the lithium ion battery. The application can replace the existing ceramic-coated separator. The lithium ion battery comprises an anode material, a cathode material and the ceramic-coated separator. The ceramic slurry is mixed into the ceramic-coated separator, so that the heat resistance and the interface performance of the ceramic-coated separator are improved.

Description

technical field [0001] The invention relates to lithium ion batteries, in particular to the preparation of a high-safety ceramic diaphragm and its application in lithium ion batteries. Background technique [0002] As a chemical power system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile communications, Digital products and other fields, and it is very likely to become the most important power supply system in the field of energy storage and electric vehicles. [0003] In lithium-ion batteries, the separator mainly plays the role of preventing positive and negative electrodes from contacting and allowing ion conduction, and is an important part of the battery. At present, commercial lithium-ion batteries mainly use polyolefin diaphragm materials with microporous structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/449H01M50/451
CPCH01M10/0525H01M50/446H01M50/403H01M50/449Y02E60/10
Inventor 赵金保彭龙庆张鹏
Owner XIAMEN UNIV
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