Insertion/removal kinetics of lithium ion in spinel LiCuxMn2-xO4
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 lithium ion in the lattice of the spinel oxide.Similar to chromium,the doping of copper in spinel lithium manganese oxide results the increase of the charge transfer resistance and the double layer capacitance for lithium insertion or removal,and the decrease 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.
insertion and removal kinetics spinel lithium manganese dioxide doping copper
ZENG Rong-hua LI Wei-shan Lü Dong-sheng HUANG Qi-ming ZHAO Ling-zhi
School of Chemistry and Environment,South China Normal University,Guangzhou 510006,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）