草酸盐共沉淀法合成锂离子电池LiNi_xMn_(0.8-x)Co_(0.2)O_2(x=0.4,0.5)正极材料及电化学性能  

Preparation and electrochemical performance of LiNi_xMn_(0.8-x)Co_(0.2)O_2(x=0.4,0.5) anode material by oxalate co-precipitation method for lithium ion batteries

作　　者：胡传跃[1] 郭军[1] 文瑾[1] 

机构地区：[1]湖南人文科技学院化学与材料科学系,娄底417000

出　　处：《化工新型材料》2013年第12期107-110,共4页New Chemical Materials

基　　金：湖南省教育厅资助科研重点项目(13A047);湖南省科技计划资助项目(2011GK2002;2011FJ3160);湖南省自然科学基金资助项目(07JJ6082)

摘　　要：采用草酸盐共沉淀法,结合高温固相反应法,合成了LiNix Mn0.8-x Co0.2O2(x=0.4,0.5)粉末材料,考察了焙烧时间和镍含量对LiNix Mn0.8-x Co0.2O2(x=0.4,0.5)结构与性能的影响。采用XRD、SEM和电池充放电测试方法等表征了材料的结构与性能。结果表明,800℃焙烧20h制备的LiNi0.5Mn0.3Co0.2O2具有良好的层状结构和综合电化学性能,阳离子混排程度小、六角晶格有序性好。0.2C倍率首次入放电容量为151mAh/g,循环20次后放电容量为148.4mAh/g。SEM结果表明LiNi0.5Mn0.3Co0.2O2是由0.5μm的一次颗粒组成,LiNi0.4Mn0.4Co0.2O2材料由0.5μm的一次颗粒团聚而成约8μm的二次颗粒组成。The layered LiNixMn0.8-xCo0.2O2（x=0.4,0.5）anode material for lithium ion batteries was synthesized by oxalate co precipitation method. The structure and electrochemical properties of LiNixMn0.8-xCo0.2O2 were characterized by XRD, SEM and galvanostatic charge discharge cycling. The results showed that LiNixMn0.8-xCo0.2O2 powder sample syn- thesized at 800℃ for 20h revealed good intergration electrochemical properties and well-ordered hexagonal layered structure with low cation mixing. The discharge capacity of the anode was 151 mA · h/g at 0. 2C rate in the first cycle and 148. 4mAh/g aher 20 cycles, The electrochemical performance of LiNixMn0.8-xCo0.2O2 was better than that of LiNixMn0.8-xCo0.2O2. It was due to the higher content of Ni and the difference of particle feature. The LiNixMn0.8-xCo0.2O2 powder consisted of 0. 5μm primary particles. The LiNixMn0.8-xCo0.2O2 powder consisted of 8ptm secondary particles agglomerated from 0. 5μm primary particles.

关 键 词：锂离子电池 正极材料 草酸盐共沉淀 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]