Zn对锂电池材料LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2结构和电化学性能的影响  

Effect of Zinc on Structure and Electrochemical Properties of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 as Cathode of Li-Ion Batteries

作　　者：王剑华[1] 陈添才[1] 黄瑞安[1] 周小静[1] 

机构地区：[1]昆明理工大学云南省新材料制备与加工重点实验室,云南昆明650093

出　　处：《稀有金属材料与工程》2010年第A01期525-529,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(203630002);校企基金资助项目(KKZ4200730010)

摘　　要：采用共沉淀法掺入少量Zn得到Li(Ni1/3Co1/3Mn1/3)1-xZnxO2材料。通过X射线衍射、光电子能谱(XPS)和电化学测试研究掺杂对其晶体结构、元素价态和电化学行为的影响。结果表明:掺入Zn增大晶格常数;在粉末颗粒表面的Zn含量是颗粒内部的数十倍;掺杂后Co、Mn依然保持+3、+4价,但是Ni由+2、+3混合价态组成;掺入少量Zn阻止电极在4.5V电位下的不可逆氧化反应;掺入Zn有效改善高截止电压下的循环容量保持能力,其作用与改变材料表面状态有关。Zinc doped LiNi1/3CO1/3Mn1/3O2 materials were prepared by a co-precipitation method. The products were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, and galvanostatic cycling. Zinc doping can increase the lattice constant The zinc content in the surface of the particles is tens of times of that in the particles. The electronic state of d-ions in the surface layer of particles correspond to Ni2＋/Ni3＋, Co3＋, and Mn4＋. The electrochemical performance of LiNi1/3CO1/3Mn1/3O2 can be greatly affected by zinc substitution. Zinc substitution brings obvious improvement of cycling performance between 2.75-4.6 V. The improvement was ascribed to prevention of the irreversible reaction at 4.5 V. The structural and electrochemical properties of the doped materials were correlated.

关 键 词：正极材料 锂电池 掺杂 XPS 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ15[化学工程—电化学工业]