Li[Li_(1/9)Ni_(1/3)Mn_(5/9)]O_2的制备及性能研究  

Synthesis and performance of Li[Li_(1/9)Ni_(1/3)Mn_(5/9)]O_2 cathode materials

作　　者：万新华[1] 余仲宝[1] 王静[1] 刘庆国[1] 

机构地区：[1]北京科技大学固体电解质研究室,北京100083

出　　处：《电池》2004年第2期84-86,共3页Battery Bimonthly

摘　　要：用共沉淀工艺制备出锰镍复合氢氧化物[M(OH)2,M=Mn和Ni],利用该复合氢氧化物前驱体和锂盐球磨混均后,高温焙烧,然后利用液氮淬火合成出一种新型的锂离子电池正极材料Li[Li1/9Ni1/3Mn5/9]O2。通过SEM、XRD和电化学性能测试,发现该材料具有较大的表面积和层状结构,同时表现出较高的充放电容量、较佳的循环性能和较好的结构稳定性。用锂片和Li[Li1/9Ni1/3Mn5/9]O2分别作为负极和正极组装成扣式电池,在2 00～4 60V之间、充放电电流为30mA/g条件下进行了循环测试,结果表明:这种材料首次放电容量可高达200mAh/g以上,15次循环后容量保持率为88 9%。M(OH)_2 (M=Mn、Ni) which could be used as a precursor were prepared by co-precipitation technique.The precursor was mixed uniformly with LiOH and the mixture was sintered at high temperature.Then the Li[Li_(1/9)Ni_(1/3)Mn_(5/9)]O_2 which could be used as a new-type cathode material for lithium-ion batteries was synthesized by quenching with liquid nitrogen.The SEM,XRD and electrochemical performance test results showed that the compound had large surface area, a layered structure, high discharge capacity, excellent cycling performance, and good structure stability. Two-electrode button cells were assembled by using lithium foil and Li[Li_(1/9)Ni_(1/3)Mn_(5/9)]O_2 as the anode and the cathode and cycled between 2.00?V and 4.60?V of a current of 30?mA/g, the synthesized material could deliver over 200?mAh/g in the first cycle and maintain 88.9% capacity retention after 15 cycles.

关 键 词：锂离子电池 正极材料 Li[Li1/9Ni1/3Mn5/9]O2 电化学性能 循环性能 测试 

分 类 号：TM911[电气工程—电力电子与电力传动]