钴掺杂对Li_(1.2)Mn_(0.6)Ni_(0.2)O_2电化学性能的影响  

Influence of Co doping on electrochemical properties of Li_(1.2)Mn_(0.6)Ni_(0.2)O_2

作　　者：刘超[1] 刘红光[1,2] 叶学海[2] 郅晓科[2] 何爱珍[2] 赵桢[2] 王旭阳[2] 章甦[2] 时洁[2] 

机构地区：[1]河北工业大学,天津300130 [2]中海油天津化工研究设计院

出　　处：《无机盐工业》2013年第10期60-62,共3页Inorganic Chemicals Industry

摘　　要：利用共沉淀法制备了锂离子电池正极材料Li1.2Mn0.6Ni0.2O2和Li1.2Mn0.588Ni0.196Co0.016O2,并利用XRD、SEM和充放电测试对其晶体结构、形貌和电化学性能进行了表征。XRD结果表明:掺杂钴材料后,材料的层状结构保持完整,阳离子混排程度降低。电化学性能测试结果表明:掺钴材料的首次充放电效率和倍率放电性能明显优于Li1.2Mn0.6Ni0.2O2,且表现出较优的循环性能,其1、2、5 C放电比容量分别为230.3、215.6、155.6 mA·h/g,1 C下循环50次的容量保持率为90.9%。Lil.2Mn0.6Nio.202 and Li~.2Mn0.sssNio.l^Co0.01602,cathode materials of lithium-ion batteries were synthesized by co-pre- cipitation method.Their crystal structures, morphologies, and electrochemical properties were characterized by X-ray diffrac- tion （XRD）, scanning electron microscopy （SEM）, and electrochemical tests.XRD results indicated that material＇s layered structure was kept intact and cation mixing degree was lowered after Co-doping.Electrochemical tests showed that：the initial charge-discharge efficiency and rate discharge performance of the Co-doping material were superior to those of Lil2Mn0.6Ni0：O2, and better cycle performance was displayed. Its discharge capacities were 230.3,215.6,155.6 mA. h/g at 1,2,5 C,respec- tively, and the capacity retention rate was up to 90.9% at 1 C after 50 cycles.

关 键 词：锂离子电池 正极材料 CO掺杂 Lill2Mnn6Ni0202 

分 类 号：TQ138.12[化学工程—无机化工]