Invalidation Mechanism of Alloy Materials for Li-ion Batteries

Chem. J. Chinese Universities

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Invalidation Mechanism of Alloy Materials for Li-ion Batteries

WANG Lian-Bang^*, YANG Zhen-Zhen, KANG Hu-Qiang, HUANG Li-Jun, MAO Xin-Biao, MA Chun-An

College of Chemical Engineering and Materials Science, Zhejiang University Technology, Hangzhou 310014, China

Received:2008-03-27 Revised:1900-01-01 Online:2009-01-10 Published:2009-01-10
Contact: WANG Lian-Bang

Abstract

Abstract: Sn-based alloy is a promising negative material for Li-ion batteries. In this work, Sn/Cu film was prepared by electroplating method. After heat treatment, a Cu₆Sn₅ alloy was formed. Experimental results show that a lot of Li oxide is formed during Li insertion process due to the decomposition of organic electrolyte, which resulted in a large volume expansion of alloy electrode. After Li extraction, some Li was remained in Li₂SnCu, which resulted in an irreversible capacity decay at the first cycle. Some novel electrolytes may be helpful to relax the volume expansion and enhance the cycle life of alloy electrode materials.

Key words: Lithium ion battery, Alloy material, Invalidation, Volume expansion

CLC Number:

O646.21

TrendMD:

WANG Lian-Bang^*, YANG Zhen-Zhen, KANG Hu-Qiang, HUANG Li-Jun, MAO Xin-Biao, MA Chun-An. Invalidation Mechanism of Alloy Materials for Li-ion Batteries[J]. Chem. J. Chinese Universities, doi: .

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Invalidation Mechanism of Alloy Materials for Li-ion Batteries

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