High-rate capability of spinel LiNi0.05Mn1.95O4 cathode for Li-ion batteries prepared via coprecipitated precursor
(0) 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 m) 3 Fd 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.
Li-ion battery rate capability Ni-doped Mn spinel coprecipitation
SUN Bin SHEN Guo-pei HU Yan-long
College of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,C Guangzhou Hongsen Material Co. Ltd.,Guangzhou 510760,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）