溶胶-碳热法制备LiFe_(1-x)Co_xPO_4/C及其电化学性能研究  

Electrochemical performance of LiFe_(1-x)Co_xPO_4/C prepared by a sol-carbothermal method

作　　者：谢刚[1] 倪聪[1] 曹寅[1] 刘晓敏[1] 杨晖[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《化工新型材料》2014年第5期144-146,共3页New Chemical Materials

基　　金：江苏省自然科学基金(BK2011030);江苏省省属高校自然科学研究重大项目(11KJA430006)

摘　　要：采用溶胶—碳热法制备LiFe1-xCoxPO4/C(x=0,0.05,0.1)复合正极材料。研究发现:钴离子掺杂不改变磷酸铁锂的晶体结构特征,在LiFePO4/C复合材料掺杂金属离子后,材料的电化学性能得到改善。原因是掺杂可以使材料内部产生部分缺陷,缺陷的产生有利于提高材料的导电性,从而提高电化学性能。LiFe0.95Co0.05PO4/C具有最好的电化学性能,循环中最高的放电容量为152.3mAh/g,50次循环后放电容量为146.4mAh/g,容量保持率为96.2%。LiFe1-xCoxPO4/C（x= 0,0. 05,0. 1）anode materials were synthsized by sol-carbothermal method. It was found that, after doping with Co^2＋ , the structure of LiFePO4/C remained the olivine structure and the electrochemical performance of LiFePO4/C anode material was improved. The reason was that the formation of some defects, appeared in the crystal grain, would promote the improvement of electronic conductivity. The LiFe1-x Cox PO4/C（x= 0. 05） showed the best electrochemical performance, which presented the largest discharge capacity of 152. 3mAh/g during charge-discharge process. The discharge capacity slightly decreased to 146.4mAh/g after 50 cycles, the discharge capacity retention rate was 96.2%.

关 键 词：溶胶-碳热法 钴离子掺杂 LiFeO4 

分 类 号：TM912[电气工程—电力电子与电力传动]