Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 17, Issue 6, Pages 1324-1327Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(07)60270-2
Keywords
lithium ion batteries; LiMn2O4; surface coating; SrF2
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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 degrees C, 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 center dot h/g, and 97% initial capacity retention.
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