Microstructure and electrochemical performances of LiF-coated spinel LiMn2O4
LiF-coated LiMn2O4 samples were prepared via a chemical method.X-ray diffraction (XRD) patterns show that the bare LiMn2O4 and the LiF-coated LiMn2O4 samples are all spinel structure in m 3 Fd space group.The apparent morphologies,the spectroscopic properties and the LiF distributions of the as-prepared samples were studied by scanning electronic microscopy (SEM),Fourier infrared spectroscopy (FTIR),transmission electronic microscopy (TEM),selected area electron diffractometry (SAED) respectively.The LiF-coated LiMn2O4 gets a more stable surface than bare LiMn2O4,and changes the interaction between the cathode material and the electrolyte.Therefore,it can endure overcharge in the secondary lithium batteries,and achieve better electrochemical performances even when charged to 4.7 V and 4.9 V.
spinel LiMn2O4 secondary lithium batteries surface modification LiF-coating
BAI Ying WU Chuan WU Feng
School of Chemical Engineering and Environment,Beijing Institute of Technology,Beijing 100081,China;National Development Center for High Technology Green Materials,Beijing 100081,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）