杂质对天然石墨电化学嵌/脱锂性能的影响  

Effect of impurities on electrochemical intercalation/deintercalation Li performance of natural graphite

作　　者：周向阳[1] 李劼[1] 肖劲[1] 刘业翔[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《电池》2003年第1期3-5,共3页Battery Bimonthly

摘　　要：利用恒电流充放电、循环伏安等测试方法,研究了Fe、Si、Al的氧化物杂质对天然石墨嵌/脱锂性能的影响。实验结果显示,如SiO2之类的"惰性"杂质只影响材料的比容量,而诸如Fe2O3之类的"活性"杂质除了会降低锂离子电池的比容量外,还会消耗正极材料中的锂,造成电池的循环寿命缩短;但有的"活性"杂质能改善电池的大电流充放电性能。The effects of oxide impurities of Fe,Si,Al on electrochemical intercalation/deintercalation Li performance were investigated by constant current chargedischarge and cyclic voltammetry The results showed that 'inert' impurity such as SiO2 only affected specific capacity'Active' impurities like Fe2O3 not only decreased specific capacity,but shortened cycling life of Liion battery by consuming Li in cathode material.Some 'active' impurities could improve chargedischarge properties in larger current density

关 键 词：杂质 天然石墨 电化学 嵌/脱锂性能 氧化物杂质 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]