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24卷    第3期    总第180期    2014年3月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1004-0609(2014)03-0725-08
Li(1+x)Ni0.166Co0.166Mn0.667O(2.175+x/2) 正极材料的喷雾干燥法合成及电化学性能
黄 果1, 2,杨顺毅2, 3,雷钢铁1,黄友元2,岳 敏2,胡社军3,任建国2,侯贤华3

(1. 湘潭大学 化学学院,湘潭 411105;
2. 深圳市贝特瑞新能源材料股份有限公司,深圳 518106;
3. 华南师范大学 物理与电信工程学院,广州 510631
)

摘 要: 采用喷雾干燥法制备锂离子电池用层状富锂锰基正极材料Li(1+x)Ni0.166Co0.166Mn0.667O(2.175+x/2)(x=0.3,0.4,0.5,0.6),通过X射线衍射(XRD)、扫描电子显微镜(SEM)、等离子体发射光谱(ICP)、热重-差热分析(TG-DSC)、比表面积、粒度分布和恒流充放电等测试手段对材料的结构、形貌及电化学性能进行表征。结果表明:所制得的富锂锰基正极材料为三方层状结构( )的 LiNi1/3Mn1/3Co1/3O2和单斜层状结构(C2/m)的Li2MnO3组成的固溶体,且具有多孔球形形貌。当x=0.4时,材料具有最优的电化学性能。在2.0~4.8 V电压范围内,25 mA/g电流密度下材料的首次放电比容量高达277.5 mA?h/g,20周循环后容量保持率达95.3%,500 mA/g电流密度下放电比容量仍达192.5 mA?h/g。

 

关键字: 锂离子电池;正极材料;富锂锰基;喷雾干燥法

Spray drying synthesis and electrochemical performance of Li(1+x)Ni0.166Co0.166Mn0.667O(2.175+x/2) cathode materials
HUANG Guo1, 2, YANG Shun-yi2, 3, LEI Gang-tie1, HUANG You-yuan2, YUE min2, HU She-jun3, REN Jian-guo2, HOU Xian-hua3

1. School of Chemistry, Xiangtan University, Xiangtan 411105, China;
2. Shenzhen BTR New Energy Materials Inc., Shenzhen 518106, China;
3. School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510631, China

Abstract:The layered lithium-riched manganese-based cathode materials Li(1+x)Ni0.166Co0.166Mn0.667O(2.175+x/2) (x=0.3, 0.4, 0.5, 0.6) for Li-ion batteries were synthesized by spray drying method. The structures, morphologies and electrochemical performance of the as-prepared materials were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), inductively coupled plasma (ICP), thermo-gravimetric/differential scanning calorimeter analysis (TG/DSC), specific surface area, particle size distribution and galvanostatic charge-discharge tests. The results indicate that the obtained lithium-riched manganese-based cathode materials consist of the layered trigonal LiNi1/3Mn1/3Co1/3O2 phase ( ) and monoclinic Li2MnO3 phase (C2/m), and show the special porous spherical morphology. When x is 0.4, the cathode shows the best electrochemical performance. It exhibits the initial discharge capacity of 277.5 mA?h/g and the capacity retention after 20 cycles reaches 95.3% between 2.0 and 4.8 V at current density of 25 mA/g. The discharge capacity of the cathode still approaches to 192.5 mA?h/g, even when the cathode is cycled at 500 mA/g.

 

Key words: lithium ion battery; cathode material; lithium-riched manganese based; spray drying

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