锂离子蓄电池正极材料LiFe_(0.7)Mn_(0.3)PO_4的制备与性能  

Synthesis and electrochemical properties of LiFe_(0.7)Mn_(0.3)PO_4 cathode material for lithium ion battery

作　　者：肖卓炳[1] 麻明友[1] 何则强[1] 吴显明[1] 刘建本[1] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000

出　　处：《电源技术》2005年第12期805-807,共3页Chinese Journal of Power Sources

基　　金：湖南省自然科学基金(03JJY6005);湖南省教育厅科研项目(02C308)

摘　　要：采用固相反应法制备了Mn掺杂的LiFe0.7Mn0.3PO4,采用元素分析、X射线衍射、扫描电镜等方法对样品进行了表征,测试了其电化学性能。结果表明,与没有掺杂的LiFePO4材料相比,LiFe0.7Mn0.3PO4具有更高的放电比容量、更好的循环性能及高倍率性能。0.05C倍率放电时,LiFe0.7Mn0.3PO4的首次放电容量达140mAh·g-1以上,经10次循环后平均每次循环的容量衰减为1.53%;0.1C和0.2C放电时的放电容量分别为0.05C放电容量的73.5%和62.1%。LiFe0.7Mn0.3PO4 was prepared by solid-state reaction and characterized by element analysis,XRD,SEM combined electrochemical methods. Studies on electrochemical properties show that LiFe0.7Mn0.3PO4 has higher discharge capacity and better cyclability and rate capability compared with no doping LiFePO4. LiFe0.7Mn0.3PO4 delivered a discharge capacity of more than 140 mAh·g^-1 at a current rate of 0.05 C and the capacity loss per cycle was about 1.53% after 10-time charge/discharge cycles. 73.5% and 62.1% of the discharge capacity can be retained at a current rate of 0.1 C and 0.2 C, respectively.

关 键 词：锂离子蓄电池 正极材料 LIFEPO4 锰掺杂 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]