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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 2    April 2006

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Preparation and property of spinel LiMn2O4 material by co-doping anti-electricity ions
XIAO Jin(肖 劲), ZHU Hua-li(朱华丽), CHEN Zhao-yong(陈召勇),
PENG Zhong-dong(彭忠东), HU Guo-rong(胡国荣)

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:LiMn2-xMxO4-yFy(x=0.05; y=0.05; M=Al, Co, Cr and Mg, separately), as the cathode material, was synthesized by the method of high temperature solid-state reaction in laboratory. The results of charge-discharge test show that the properties of LiMn1.95M0.05O3.95F0.05(M= Al, Mg) are obviously superior to those of LiMn2O4. Through the condition experiments on sintering temperature, it is found that the materials present the integrate crystal structure and favorable cycle performance at 800 ℃. The research on the effects of different Mg2+ sources on the properties of LiMn2-xMgxO4-yFy shows that, with Mg(OH)2 and LiF as the reagents respectively offering Mg2+ and F−, LiMn1.95Mg0.05O3.95F0.05 synthesized has integrate crystal structure and its capacity hardly fades. The results of cyclic voltammetry indicate that the shape of two couples of redox peaks of the material synthesized by co-doping anti-electricity ions is more integrate and symmetrical than that of pure spinel LiMn2O4, which reveals that the co-doping material possesses preferable electrochemical reversibility.

 

Key words: Li-ion batteries; cathode material; LiMn2O4; Co-doping; anti-electricity ions; cycle performance

ISSN 1672-7029
CN 43-1423/U

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