Sn^(4+)掺杂对正极材料Li_(1/3)Ni_(1/3)Co_(1/3)Mn_(1/3)O_2性能的影响  

Effect of Sn^(4+) on the performance of Li_(1/3)Ni_(1/3)Co_(1/3)Mn_(1/3)O_2 cathode materials

作　　者：杨晓冬[1] 胡志强[1] 李佳书[1] 秦艺颖 

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034

出　　处：《大连工业大学学报》2016年第2期131-134,共4页Journal of Dalian Polytechnic University

基　　金：国家高技术研究发展计划(863计划)项目(2006AA05Z417);大连市科技建设平台项目(2010-3547)

摘　　要：采用共沉淀法合成掺杂的Li_(1/3)Ni_(1/3)Co_(1/3)Mn_(1/3-x)Sn_xO_2的正极材料,通过X射线光谱、扫描电镜、充放电测试等技术对Li_(1/3)Ni_(1/3)Co_(1/3)Mn_(1/3-x)SnxO_2材料的结构、形貌、电化学性能进行表征。结果表明,采用共沉淀法Sn4+能有效掺杂进正极材料Li_(1/3)Ni_(1/3)Co_(1/3)Mn_(1/3)O_2的体相结构。掺杂量x=0.04时,在2.8~4.2V、0.2C倍率下掺杂的正极材料首次充放电比容量为138.5mA·h/g,30次循环后的容量保持率为96.96%。掺杂Sn4+对Li_(1/3)Ni_(1/3)Co_(1/3) Mn_(1/3)O_2正极材料改性后,材料仍保持典型的α-NaFeO_2层状结构,且晶型良好,表明Sn4+掺杂能够有效改善材料的电化学性能。The anode material of Li_（1/3）Ni_（1/3）Co_（1/3）Mn_（1/3-x）Sn_xO_2 was synthesized by a coprecipitation method and the structure,morphology and electrochemical properties were characterized by XRD,SEM and charge-discharge test technology.The results showed that the first charge-discharge specific capacity was 138.5 mA·h/g and the capacity rate was 96.96% after 30 cycles when doping anode material ratio was 0.2C,x = 0.04 and the voltage was 2.8-4.2 V.The modified materials could remain typical layer structure ofα-NaFeO_2 and the structure of crystals was good,indicating the electrochemical properties were improved after doping Sn4＋.

关 键 词：锂离子电池 正极材料 Li1/3Ni1/3Co1/3Mn1/3O2 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]