Influence of carbon coating prepared by microwave pyrolysis on properties of LiNi_(1/3) Mn_(1/3) Co_(1/3) O_2  

微波热解法制备的炭涂层对LiNi_(1/3)Mn_(1/3)Co_(1/3)O_2性能的影响(英文)

作　　者：韩亚梅[1,2,3] 张正富 张利波[2,3] 彭金辉[2,3] 傅梦笔[2,3] C.SRINIVASAKANNAN[4] 杜江 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]昆明理工大学微波工程应用及装备技术国家地方联合工程实验室,昆明650093 [3]昆明理工大学非常规冶金教育部重点实验室,昆明650093 [4]Chemical Engineering Department,The Petroleum Institute

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第10期2971-2976,共6页中国有色金属学报（英文版）

基　　金：Project(U1202272)supported by the National Natural Science Foundation of China

摘　　要：A novel synthesis method of carbon-coated LiNil/3Mnl/3COl/302 cathode material for lithium-ion battery was reported. The carbon coating was produced from a precursor, glucose, by microwave-pyrolysis method. The prepared powders were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, X-ray fluorescence （XRF） and charge/discharge tests. XRD results indicate that the carbon coating does not change the phase structure of LiNil/3Mnl/3C01/302 material. SEM results show that the surface of spherical carbon-coated material becomes rough. Electrochemical performance results show that the carbon coating can improve the cycling performance of LiNii/3Mnl/3C01/302. The specific discharge capacity retention of the carbon-coated LiNi1/3Mnt/3Col/30z reached 85.0%-96.0% at the 50th cycle at 0.2C rate, and the specific discharge capacity retention is improved at a high rate.报道了炭包覆锂离子电池正极材料LiNi1/3Mn1/3Co1/3O2的新工艺。炭涂层由前驱体葡萄糖通过微波热解而形成。采用X射线粉末衍射(XRD)、扫描电镜、X射线荧光测试和恒流充放电测试来表征所制备的材料。XRD结果表明,炭包覆没有改变LiNi1/3Mn1/3Co1/3O2材料的相结构。SEM结果表明,炭包覆的LiNi1/3Mn1/3Co1/3O2颗粒表面变得粗糙。充放电测试结果显示,炭包覆的LiNi1/3Mn1/3Co1/3O2的循环性能与未包覆的相比得到提高。炭包覆的LiNi1/3Mn1/3Co1/3O2在0.2C倍率下循环50次的容量保持率由84.8%提升到95.5%,且高倍率下材料的容量保持率得到提高。

关 键 词：lithium-ion battery cathode material carbon coating microwave pyrolysis method electrochemical performance 

分 类 号：TM912[电气工程—电力电子与电力传动]