共沉淀法制备正极材料LiFePO_4的研究  

Synthesis of Cathode Material LiFePO_4 for Rechargeable Lithium-Ion Battery by Co-Precipitation Method

作　　者：杨蓉[1] 赵铭姝[1] 杜宝中[2] 宋晓平[1] 孙占波[1] 

机构地区：[1]西安交通大学理学院,陕西西安710049 [2]西安理工大学理学院,陕西西安710048

出　　处：《稀有金属材料与工程》2007年第A02期631-634,共4页Rare Metal Materials and Engineering

基　　金：陕西省教育厅资助项目(No.04JK225);西安理工大学基金(No.108-210505)

摘　　要：以氢氧化锂、硫酸亚铁铵和磷酸氢二铵为原料,研究了液相共沉淀法制备LiFePO_4正极材料和掺杂Co^(2+)的LiFePO_4改性正极材料,并对其进行XRD、SEM分析和电化学性能测试。结果表明掺杂Co^(2+)对正极材料的初始充电比容量为156.7 mAh·g^(-1),且循环60次后,容量仍有138.7 mAh·g^(-1),容量衰减率仪为11.4%。This paper studies LiFePO4 cathode materials and Co^2＋ -doped LiFePO4 denatured cathode material prepared by liquid co-precipitation method with lithium hydroxide, ammonium ferrous sulfate and di-ammonium phosphate as raw materials. The samples are characterized by XRD, SEM and electrochemical performance test. The results show that Co^2＋ - doped LiFePO4 is simple pure olive-type phase and ithas good electrochemical performance. The testing results of the Co^2＋ -doped LiFePO4 show that the initial charge specific capacity at room temperature is 156.7mAh·g^-1 at 0.1C rate and that after the circulations for 60 times, its capacity is still 138.7 mAh·g^-1, with its attenuation rate of 11.4%, whereby indicating that a small amount of Co^2＋ doping can not change LiFePO4 crystal structure but improve electrochemical performances of material.

关 键 词：锂离子电池 正极材料 LIFEPO4 共沉淀法 

分 类 号：TM912[电气工程—电力电子与电力传动]