ZnO包覆LiNi1/3Co1/3Mn1/3O2的表面结构和电化学性能

doi:10.13208/j.electrochem.121024

电化学（中英文） ›› 2014, Vol. 20 ›› Issue (1): 60-65. doi: 10.13208/j.electrochem.121024

ZnO包覆LiNi_1/3Co_1/3Mn_1/3O₂的表面结构和电化学性能

刘昌位，王宇，郭玉忠，淡露露，王剑华^*

昆明理工大学材料科学与工程学院，云南昆明 650093

收稿日期:2012-10-24 修回日期:2013-01-19 出版日期:2014-02-25 发布日期:2014-02-24
通讯作者: 王剑华 E-mail:wjianna@163.com
基金资助:
昆明理工大学校基金项目（No. KKZ4200730010）资助

Surface Structure and Electrochemical Performance of ZnO Coated LiNi_1/3Co_1/3Mn_1/3O₂

LIU Chang-wei, WANG Yu, GUO Yu-zhong, DAN Lu-lu, WANG Jian-hua^*

College of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Received:2012-10-24 Revised:2013-01-19 Published:2014-02-25 Online:2014-02-24
Contact: WANG Jian-hua E-mail:wjianna@163.com

摘要/Abstract

摘要： 在LiNi_1/3Co_1/3Mn_1/3O₂正极材料表面包覆ZnO，通过X射线衍射（XRD）和光电子能谱（XPS）分析包覆层对正极材料表面状态的改变，并考察了改性后材料的放电容量、首次不可逆容量等电化学性能变化. 结果表明：ZnO主要存在于材料表面并影响着材料表面组成和电化学性质，材料表面镍和锰的含量随着包覆量的增加而增大；400 ^oC热处理可使过渡金属与锌在材料表面形成复合氧化物，过渡金属的结合能增大；包覆2%（by mass，下同）的ZnO可有效抑制55 ^oC下充放电时3.6 V附近的不可逆反应，提高了材料的首次库仑效率；包覆2% ZnO的电池材料在55 ^oC/0.5C的放电比容量和循环寿命最佳.

关键词: LiNi_1/3Co_1/3Mn_1/3O₂, 包覆, 表面, 锂离子电池

Abstract: The surface of LiNi_1/3Co_1/3Mn_1/3O₂particles were modified by ZnO. Surface structure and electrochemical properties of the coated materials were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical tests. The results show that a ZnO coating affects the surface composition of LiNi_1/3Co_1/3Mn_1/3O₂particles. The surface contents of nickel and manganese increase with the amount of ZnO coating. ZnO can react with LiNi_1/3Co_1/3Mn_1/3O₂and a complex oxide is formed during the heat-treatment at above 400 ^oC. The electrochemical studies suggest that a ZnO coating hinder the electrochemical reactions near 3.6 V for pristine sample. The initial columbic efficiency is significantly enhanced by coating LiNi_1/3Co_1/3Mn_1/3O₂with 2% (by mass) ZnO, which delivers high discharge capacity and shows excellent capacity retention at 55 ^oC/0.5C.

Key words: LiNi_1/3Co_1/3Mn_1/3O₂, coating, surface, lithium ion battery

中图分类号:

TM912.9

刘昌位，王宇，郭玉忠，淡露露，王剑华*. ZnO包覆LiNi_1/3Co_1/3Mn_1/3O₂的表面结构和电化学性能[J]. 电化学（中英文）, 2014, 20(1): 60-65.

LIU Chang-wei, WANG Yu, GUO Yu-zhong, DAN Lu-lu, WANG Jian-hua*. Surface Structure and Electrochemical Performance of ZnO Coated LiNi_1/3Co_1/3Mn_1/3O₂[J]. Journal of Electrochemistry, 2014, 20(1): 60-65.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.121024

https://electrochem.xmu.edu.cn/CN/Y2014/V20/I1/60

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ZnO包覆LiNi_1/3Co_1/3Mn_1/3O₂的表面结构和电化学性能

Surface Structure and Electrochemical Performance of ZnO Coated LiNi_1/3Co_1/3Mn_1/3O₂

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