镍掺杂阴极材料LiNi_xC0_(1-x)0_2的制备研究  

PREPARATION OF LiNi_xCO_(1-x)O_2 CATHODE MATERIALS WITH Ni DOPING

作　　者：麦立强[1] 谢永贤[1] 陈文[1] 徐庆[1] 朱泉峣[1] 邹正光[2] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]桂林工学院材料工程系,桂林541004

出　　处：《硅酸盐学报》2002年第6期739-742,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金资助项目(59802009;50062001)。

摘　　要：通过低温共沉淀法和固相合成技术制备镍掺杂锂离子电池阴极材料LiNixCo1-xO2(O≤x≤1),研究了锂源选择及预合成方式、烧结温度、保温时间和掺镍量等对产物结构和性能的影响。实验表明。采用LiOH为锂源.采取混合研磨后压块以及烘干Ni(OH)2,Co(OH)2后加入氢氧化锂的预合成方式更有利于合成反应的进行。在一定范围内,随合成时间的增长,产物的衍射峰强度增大,结构更完整,电性能更好。在600℃预烧一段时间的条件下,750℃恒温合成的产物要比650,850℃保温合成的产物层状结构更明显,首次充电容量更高。LiNixCo1-x·O2材料的最大固溶度为100％,即掺镍量x=0-1的范围内,均能合成出结构良好的LiNixCol-xO2,并且,LiNi0.3Co0.7O2的初始容量高达156.146 mA·h/g。LiNixCo1-xO2(0≤x≤1) was synthesized in air by means of low temperature solution co-precipitation technique and solid state reaction method. The effects of lithium resources, pretreatment method, sintering temperature, heat treatment time and Ni doping amount on microstructure and properties of the products were examined. The results show that using LiOH as lithium resources and extrusion molding after mixed grinding, and adding LiOH after stoving Ni(OH)2 and Co(OH)2 are favorable for the synthesis . Better layer structure and higher initial capacity were found for samples preheated at 600℃ and then sintered at constant temperature 750℃ than for those sintered at constant temperature 650 ℃or 850℃ only. The longer the heat treatment time is, the stronger the products' XRD peaks strength and the better the electrochemical performances. The initial capacity of LiNi0.3Co0.7O2 is found very high, viz . 156.146 mA·h/g.

关 键 词：镍 掺杂 阴极材料 LINIXCO1-XO2 制备 研究 阴极材料 掺杂 掺镍氧化钴锂 固溶度 共沉积法 

分 类 号：TM910.3[电气工程—电力电子与电力传动] TQ13[化学工程—无机化工]