您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

[PDF Download]    

    

Insertion/removal kinetics of lithium ion in spinel LiCuxMn2−xO4
ZENG Rong-hua(曾荣华), LI Wei-shan(李伟善),LÜ Dong-sheng(吕东生), HUANG Qi-ming(黄启明), ZHAO Ling-zhi(赵灵智)

School of Chemistry and Environment, South China Normal University,Guangzhou 510006, China

Abstract: The insertion/removal processes of lithium ion in spinel lithium manganese oxide(LiMn2O4) and copper doped spinel lithium manganese oxide (LiCuxMn2−xO4) on a powder microelectrode were studied by electrochemical impedance spectroscopy(EIS), cyclic voltammetry(CV) and X-ray diffractometry(XRD). The insertion/removal process of lithium ion in the spinel oxides consists of three steps: charge transfer of lithium ion on the surface of the spinel oxides, diffusion and occupation of lithium ion in the lattice of the spinel oxide. Similar to chromium, the doping of copper in spinel lithium manganese oxide results in the increase of the charge transfer resistance and the double layer capacitance for lithium insertion or removal, and the decrease of the diffusion coefficient of lithium ion in the lattice of spinel oxide. However, the insertion capacitance, a parameter reflecting the occupation of lithium ion in the lattice of the spinel oxide, is hardly influenced by the doping of copper. The influence of the doped copper on the kinetic process of lithium insertion/removal in spinel lithium manganese oxide is related to the contraction of spinel lattice.

 

Key words: insertion and removal kinetics; spinel lithium manganese dioxide; doping; copper

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn