锂离子电池正极材料LiFePO_4离子掺杂改性研究进展

Research Progress in the Ion-doping Cathode Materials for Li-ion Batteries of LiFePO_4

橄榄石型LiFePO4是近年发展起来的一种锂离子电池正极材料,但是LiFePO4的电子导电率低,锂离子扩散速度慢,限制了其实用化,其中一种很有效的方法就是在LiFePO4的晶格中掺杂金属离子,使其产生晶格缺陷,促进Li+扩散,改善晶体内部的导电性能,本文综述了LiFePO4近几年在离子掺杂改性方面的研究进展,从掺杂原理、掺杂种类和掺杂方法及效果等方面对这一研究作了讨论分析。

Olivine LiFePO4 is a new kind of cathode material for lithium-ion battery. But the intrinsic defects of poor electronic and ionic conductivity have limited its application in industry. Among the metods it was the most effective way to dope metal ions in the lattice of LiFePO4 to produce the lattice defects,and promote the spread of Li +,then improve the electrical conductivity of the internal crystal,This paper reviews the research progress of ion-doping LiFePO4 in recent years. The paper has discussed this research from the following aspects,the principle,sort,method of doping and the effect of doping and so on.