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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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High-rate capability of spinel LiNi0.05Mn1.95O4 cathode for
Li-ion batteries prepared via coprecipitated precursor
SUN Bin(孙 斌)1, 2, SHEN Guo-pei(申国培)2, HU Yan-long(胡燕龙)2

1. College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;
2. Guangzhou Hongsen Material Co. Ltd., Guangzhou 510760, China

Abstract:Spinel LiNi0.05Mn1.95O4 cathode material for lithium ion batteries was synthesized by solid-state reaction from coprecipitated Ni-Mn hydroxide precursors and characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and galvanostatic charge-discharge tests. It is found that LiNi0.05Mn1.95O4 powder has an ordered cubic spinel phase (space group  and exhibits superior rate capability. After 450 cycles, the LiNi0.05Mn1.95O4/carbonaceous mesophase spheres(CMS) Li-ion batteries can retain 96.0% and 93.3% capacity at 5C and 10C charge/discharge rate, respectively, compared with 85.3% (5C) and 80.5% (10C) retention for LiMn2O4 batteries. However, the initial discharge capacity of LiNi0.05Mn1.95O4/CMS batteries at 1C charge/discharge rate (96.20 mA∙h/g) is slightly lower than that of the LiMn2O4 batteries (100.98 mA∙h/g) due to the increased average oxidation state of Mn in LiNi0.05Mn1.95O4.

 

Key words: Li-ion battery; rate capability; Ni-doped Mn spinel; coprecipitation

ISSN 1672-7029
CN 43-1423/U

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