Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第3期    总第228期    2018年3月

[PDF全文下载]    [Flash在线阅读]    [HTML全文阅读]

    

文章编号:1004-0609(2018)-03-0528-08
氧化钇包覆LiNi0.5Co0.2Mn0.3O2的结构和电化学性能
许军娜1, 2,陈晓青2,高 雄3,周友元3,肖可颂1,黄承焕3,习小明4

(1. 金瑞新材料科技股份有限公司,长沙410012; 2. 中南大学 化学化工学院,长沙410083; 3. 湖南长远锂科有限公司,长沙410205; 4. 长沙矿冶研究院有限责任公司,长沙410012)

摘 要: 以氧化钇溶胶为包覆前驱物,利用氧化钇和正极材料表面带电状态不同制备氧化钇包覆LiNi0.5Co0.2Mn0.3O2。采用X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)及电化学测试等手段对LiNi0.5Co0.2Mn0.3O2包覆前后的物相结构、表面形貌及电化学性能进行研究。结果表明:氧化钇包覆并未影响LiNi0.5Co0.2Mn0.3O2的晶体结构,氧化钇以颗粒状分布在正极材料表面,氧化钇包覆层厚度在15~25 nm,氧化钇在正极材料表面分布比较均匀。与未包覆LiNi0.5Co0.2Mn0.3O2相比,氧化钇包覆后,材料在高电压下的循环稳定性有所提高,最佳包覆量为0.4%。氧化钇包覆有效降低材料在充放电过程中的极化和电荷转移电阻。

 

关键字: 氧化钇;表面包覆;LiNi0.5Co0.2Mn0.3O2;电化学性能

Structure and electrochemical performance of yttrium oxide coated LiNi0.5Co0.2Mn0.3O2
XU Jun-na1, 2, CHEN Xiao-qing2, GAO Xiong3, ZHOU You-yuan3, XIAO Ke-song4, HUANG Cheng-huan3, XI Xiao-ming4

1. Kingray New Materials Science and Technology Co., Ltd., Changsha 410012, China; 2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 3. Hunan Changyuan LiCo Co., Ltd., Changsha 410205, China; 4. Changsha Research Institute of Mining and Metallurgy Co., Ltd., Changsha 410012, China

Abstract:Yttrium oxide coated LiNi0.5Co0.2Mn0.3O2 was successfully prepared based on the different surface potentials between the cathode material and yttrium oxide using yttrium oxide sol as coating precursor. The crystal structure, morphology and electrochemical properties of uncoated and yttrium oxide coated LiNi0.5Co0.2Mn0.3O2 were investigated by X-ray diffractometry(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and electrochemical measurements. The results indicate that the crystal structure is not affected by yttrium oxide coating, the yttrium oxide particles homogenously distribute on the surface of cathode materials and the thickness of coating layer is 15-25 nm. Comparing with the uncoated LiNi0.5Co0.2Mn0.3O2, the cycle performance of the cathode material improves after yttrium oxide coating and the optimum coating amount is 0.4%. The charge transfer resistance and the polarization are suppressed after coating during the charge-discharge processes.

 

Key words: yttrium oxide; surface coating; LiNi0.5Co0.2Mn0.3O2; electrochemical performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f-ysxb@mail.csu.edu.cn