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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Electrochemical performance of SrF2-coated LiMn2O4 cathode material for Li-ion batteries
LI Jian-gang(李建刚)1, HE Xiang-ming(何向明)2, ZHAO Ru-song(赵如松)1

1. School of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China; 2. Insitute of Nuclear and New Energy Technology, Tsinghua University, Beijing100084, China

Abstract: 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.

 

Key words: lithium ion batteries; LiMn2O4; surface coating; SrF2

ISSN 1672-7029
CN 43-1423/U

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