摘要
橄榄石结构的LiFePO4作为锂离子电池的一种新型正极材料,具有原料来源广泛、价格低廉、对环境友好、能量密度和理论容量高、放电电压稳定、热稳定性和循环性好等优点,是下一代锂离子电池正极材料有力的竞争者,但是在磷酸铁锂合成和实用化过程中却存在电导率较低的问题。本文系统地阐述了LiFePO4正极材料的结构、充放电机理以及Li+在LiFePO4中的扩散传输机理;综述了提高LiFePO4电导率的各种方法,主要是碳掺杂及包覆、添加金属粉末、掺杂高价金属离子等。
As a new type of cathode materials for lithium ion battery,the olivine LiFePO4 has many advantages,such as abundant resources,low cost,environmental friend,higher energy density and theoretical capacity,steady discharge voltage,good thermal stability and excellent cycling performance,to be a strong competitor for the next generation cathode materials for lithium ion banttery.However,the problem of lower conductivity has been very prominent in the process of synthesis and pratical of lithium iron phosphate.This article described the structure of LiFePO4 cathode material,the mechanism of charge-discharge and Li+ transport diffusion in LiFePO4.A variety of methods to improve the conductivity of LiFePO4 have been described in this paper,mainly carbon-doped and coated,doped metal powder,doped metal ion and so on.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第S2期410-413,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50904054)
"十二五"科技支撑计划项目(2011BAB08B01)
中国博士后科学基金资助项(2012M511953)
关键词
磷酸铁锂
正极材料
电导率
lithium iron phosphate
cathode material
conductivity
