Preparation and electrochemical performance of ball-like LiMn0.4Ni0.4Co0.2O2 cathode materials

被引:37
作者
Shi, S. J.
Mai, Y. J.
Tang, Y. Y.
Cu, C. D.
Wang, X. L.
Tu, J. P. [1 ]
机构
[1] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China
关键词
Layered oxide LiMn0.4Ni0.4Co0.2O2; Co-precipitation; Diffusion coefficient; LITHIUM-ION BATTERIES; RATE CAPABILITY; DISSOLUTION; CAPACITY; BEHAVIOR; KINETICS;
D O I
10.1016/j.electacta.2012.05.110
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Ball-like LiMn0.4Ni0.4Co0.2O2 particles composed of flakes were synthesized by a simplified co-precipitation method followed by a solid-state reaction at temperatures of 600-900 degrees C. The relationship between the flake thickness and the electrochemical performance of the layered oxides was investigated in this work. The layered oxide with a flake thickness of 80-100 nm synthesized at 800 degrees C has the best electrochemical performance among these cathode materials, especially the rate capability. An initial discharge capacity of 160 mAh g(-1) was obtained at 5 C (1400 mA g(-1)) in the voltage range of 2.5-4.5 V, and the capacity retention was 80% after 50 cycles. The excellent rate capability is attributed to the well formed structure, short diffusion distance and good crystallinity. In addition, a detailed study of diffusion coefficient of Li+ (DLi+) was carried out to further understand this material. The value of DLi+ calculated is in the range of 10(-11) to 10(-12) cm(2) s(-1). (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:39 / 46
页数:8
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