Improvement of electrochemical properties of LiNi0.5Mn1.5O4 spinel

被引:95
作者
Wu, XL [1 ]
Kim, SB [1 ]
机构
[1] Pohang Univ Sci & Technol, Dept Chem, Pohang 790784, South Korea
关键词
lithium-ion battery; lithium nickel manganese oxide; intercalation; impedance spectroscopy;
D O I
10.1016/S0378-7753(02)00034-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
LiNi0.5Mn1.5O4 material with a spinel structure is prepared by a sol-gel method. The material is initially fired at 850 T and then subjected to a post-reaction annealing at 600 T in order to minimize the nickel deficiency. The elevated firing temperature produces materials with a small surface-area which is beneficial for good capacity retention. Indeed, the spinel LiNi0.5Mn1.5O4 not only shows a good cycle performance, but exhibits an excellent discharge capacity, i.e. 114 mAh g(-1) at 4.66 V plateau and 127 mAh g(-1) in total. Cyclic voltammetry and ac impedance spectroscopy are employed to characterize the reactions of lithium insertion and extraction in the LiNi0.5Mn1.5O4 electrode. Excellent electrochemical performance and low material cost make this compound an attractive cathode for advanced lithium batteries. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:53 / 57
页数:5
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