Electrochemical performance of SrF2-coated LiMn2O4 cathode material for Li-ion batteries
SrF2-coated LiMn2O4 powders with excellent electrochemical performance were synthesized.The electrochemical performance of SrF2-coated LiMn2O4 electrodes was studied as function of the level of SrF2 coating.With increasing the amount of the coated-SrF2 to 2.0％ (molar fraction),the discharge capacity of LiMn2O4 decreases slightly,but the cycleability of LiMn2O4 at elevated temperature is improved obviously.In view of discharge capacity and cycleability,the 2.0％ (molar fraction) coated sample shows optimum cathodic behaviors.When being cycled at 55 ℃,as-prepared LiMn2O4 remains only 79％ of its initial capacity after 20 cycles,whereas the 2.0％ (molar fraction) coated sample shows initial discharge capacity of 108 mA·h/g,and 97％ initial capacity retention.
lithium ion batteries LiMn2O4 surface coating SrF2
LI Jian-gang HE Xiang-ming ZHAO Ru-song
School of Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing100084,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）