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15卷    第9期    总第78期    2005年9月

[PDF全文下载]        [Flash在线阅读]

    

文章编号: 1004-0609(2005)09-1396-07
锂离子电池正极材料锰钴酸锂的表征与分解动力学
赵铭姝, 汪 飞, 宋晓平

(西安交通大学 理学院, 西安 710049)

摘 要:  结合不同升温速率的差热分析, 研究了氧气气氛中锰钴酸锂分解的反应动力学。 利用Doyle-Ozawa法和Kissinger法计算各反应阶段的表观活化能, 分别为93.905, 138.012, 158.148和891.496 kJ/mol。 用Kissinger法确定了每个反应阶段的反应级数、 频率因子和动力学方程。 X射线衍射、 场发射电镜、 透射电镜以及电化学检测表明, 采用固相分段法制备的LiMn2O4型正极材料晶粒分布均匀, 形貌规整, 晶型发育完善, 电化学性能良好。 从结构化学的角度探讨了添加的钴元素对纯相LiMn2O4的Jahn-Teller效应的影响。

 

关键字:  锂离子电池; 锰钴酸锂; 合成动力学; 微观表征

Synthesizing kinetics and characteristics of LiMnCoO4 using as lithium-ion battery cathode material
ZHAO Ming-shu, WANG Fei, SONG Xiao-ping

Science School, Xi'an Jiaotong University, Xi'an, 710049, China

Abstract: The discomposing kinetics of lithium manganese cobalt oxides in dynamical oxygen atmosphere was studied by means of differential temperature analysis (DTA) with different heating rates, and it could be applied as an important theoretical principle for preparing LiMn2O4 derivants. The active energies of four reaction process are 93.905, 138.012, 158.148 and 891.496 kJ/mol, respectively. Reaction orders, frequency factors and kinetic equations of each reaction were determined by using Kissinger method. X-ray diffractrometry, field emission microscopy, transmitting electron microscopy, and electrochemistry analysis show that the LiMnCoO4 synthesized with solid-step-sintering method has a pure phase, well-distributed particle, regular appearance and good electro-chemistry properties. The influence of element of cobalt on Jahn-Teller of LiMn2O4 was discussed in the viewpoint of structural chemistry.

 

Key words: lithium-ion battery; LiMnCoO4; kinetics; precursor

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@163.com