尖晶石锰酸锂表面化学镀钴研究  

Preparation and Characterization of Co-coated LiMn_2O_4 by Electroless Plating

作　　者：刘金练[1] 吴显明[1,2] 陈上[1,2] 何则强[1] 许名飞[3] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000 [2]湘西自治州矿产与新材料技术创新服务中心,湖南吉首416000 [3]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《精细化工》2010年第8期800-803,808,共5页Fine Chemicals

基　　金：湖南省教育厅自然科学基金资助项目(07B060)~~

摘　　要：表面化学镀钴对LiMn2O4进行改性,X射线衍射、扫描电子显微镜、交流阻抗及恒电流充放电等技术检测和分析合成产物的物相、形貌及电化学性能。研究表明,与未镀钴的LiMn2O4相比,镀钴LiMn2O4粉末的X射线衍射峰强度有所变弱,样品颗粒表面粗糙,有许多小孔。化学镀钴后的LiMn2O4放电容量由改性前的123mA.h/g下降到改性后的112mA.h/g,室温下经20次循环后的容量保持率为96.8%,高于未镀钴的85.8%。55℃经20次高温循环后的比容量保持率为91.7%,远高于未镀钴的76.2%。表面镀钴后LiMn2O4的循环性能得到了显著改善。The Co-coated LiMn2O4 powders were synthesized by the electroless plating.The phase,surface morphology and electrochemical properties of the synthesized powders were characterized with X-ray diffraction,scanning electron micrograph,electrochemical impedance spectroscopy and galvanostatic charge-discharge experiments.The Co-coated LiMn2O4 shows a coarse surface with a lot of holes.The specific capacity of Co-coated LiMn2O4 is 112 mA·h/g,which is slightly smaller than 123 mA·h/g for uncoated LiMn2O4.The capacity retention of Co-coated LiMn2O4 is 96.8% and 91.7% respectively after being cycled 20 times at room temperature and the temperature of 55 ℃,which are much higher than the values of 85.8% and 76.2% for the uncoated ones.

关 键 词：锂离子电池 锂锰氧 表面处理 有机电化学与工业 

分 类 号：TM912.9[电气工程—电力电子与电力传动]