Influence of pretreatment process on structure, morphology and electrochemical properties of Li[Ni_(1/3)Co_(1/3)Mn_(1/3)]O_2 cathode material  

前处理工艺对Li[Ni_(1/3)Co_(1/3)Mn_(1/3)]O_2正极材料结构、形貌和电化学性能的影响(英文)

作　　者：杨顺毅[1] 王先友[1] 刘子玲[1] 陈权启[1] 杨秀康[1] 魏启亮[1] 

机构地区：[1]湘潭大学化学学院环境友好化学与应用教育部重点实验室,湘潭411105

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第9期1995-2001,共7页中国有色金属学报（英文版）

基　　金：Project(20871101)supported by the National Natural Science Foundation of China;Project(2009WK2007)supported by Key Project of Science and Technology Department of Hunan Province,China;Project(CX2009B133)supported by Colleges and Universities in Hunan Province Plans to Graduate Research and Innovation,China

摘　　要：The layered Li[Ni1/3Mn1/3Co1/3]O2 was separately synthesized by pretreatment process of ball mill method and solution phase route, using [Ni1/3Co1/3Mn1/3]3O4 and lithium hydroxide as raw materials. The physical and electrochemical behaviors of Li[Ni1/3Mn1/3Co1/3]O2 were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, field emission scanning electron microscopy （FESEM） and electrochemical charge/discharge cycling tests. The results show that the difference in pretreatment process results in the difference in compound Li[Ni1/3Co1/3Mn1/3]O2 structure, morphology and the electrochemical characteristics. The Li[Ni1/3Mn1/3Co1/3]O2 prepared by solution phase route maintains the uniform spherical morphology of the [Ni1/3Co1/3Mn1/3]3O4, and it exhibits a higher capacity retention and better rate capability than that prepared by ball mill method. The initial discharge capacity of this sample reaches 178 mA-h/g and the capacity retention after 50 cycles is 98.7% at a current density of 20 mA/g. Moreover, it delivers high discharge capacity of 135 mA-h/g at a current density of 1 000 mA/g.以[Ni1/3Co1/3Mn1/3]3O4和氢氧化锂为原料,分别采用球磨法和液相法前处理工艺制备层状正极材料Li[Ni1/3Mn1/3Co1/3]O2。采用X?射线衍射(XRD)、场发射扫描电镜(FESEM)、恒流充放电等手段对材料的物理和电化学性能进行表征。结果表明:采用不同前处理工艺制备出的Li[Ni1/3Mn1/3Co1/3]O2材料在结构、形貌和电化学性能上有较大差异;与球磨处理法制备的材料相比,采用液相法前处理工艺制备的Li[Ni1/3Mn1/3Co1/3]O2不但保持了前驱体较好的球形形貌,同时还具有较好的循环稳定性和倍率性能;该样品在20mA/g电流密度下,首次放电容量为178mA·h/g,50次循环后,容量保持率达98.7%;在1000mA/g电流密度下,样品容量为135mA·h/g。

关 键 词：lithium ion batteries Li[Ni1/3Co1/3Mn1/3]O2 carbonate co-precipitation method pretreatment process electrochemical characteristics 

分 类 号：TG146.263[一般工业技术—材料科学与工程]