中国粉体技术2013，Vol.19Issue(1)：68-71,4.DOI:10.3969/j.issn.1008-5548.2013.01.017
LiFePO4锂离子电池容量的衰减机制
Failure Mechanism of Lithium Ion Batteries with LiFePO4 as Anode Materials
摘要
Abstract
To investigate the failure reasons of lithium ion batteries with LiFePO4 as anode materials and the main reason for the reducing of capacity, the cycle performances of lithium ion batteries with LiFePO4 as anode materials were tested. Through dismantling those batteries, physical performances of lithium ion batteries with LiFePO4 as anode materials and graphite as cathode materials before and after cycle were characterized by XRD and SEM. The results indicate that the position of diffraction peak moves to right slightly after graphite cathode cycling 200 times. The crystal structure almost has no change. But the crystal structure of LiFePO4 anode materials has irreversible change of amorphous transformer. The grain size decreases from 3.73 run to 2.75 run. The capacity of LiFePO4 batteries reduces by 11.6% after cycling 200 times at 0.25 C discharge current. The microstructure and grain size of LiFePO4 anode materials become smaller with the increase of cycle number. So the transfer resistance of Li+ increases. That is the main failure reason of lithium ion batteries with LiFePO4 as anode materials.关键词
锂离子电池/磷酸铁锂/衰减机制/电化学性能Key words
lithium ion battery/ lithium ferric phosphate/ failure mechanism/ electrochemical performance分类
信息技术与安全科学引用本文复制引用
任冬燕,李晶,宋月丽..LiFePO4锂离子电池容量的衰减机制[J].中国粉体技术,2013,19(1):68-71,4.基金项目
国家科技支撑计划项目,编号:2007BAE12800. （）
