ABSTRACT Spinel LiMn2O4 powder was prepared by a novel process of high-temperature ball milling. For comparison, the spinel LiMn2O4 powder was also synthesized by the traditional method of solid state… Click to show full abstract
ABSTRACT Spinel LiMn2O4 powder was prepared by a novel process of high-temperature ball milling. For comparison, the spinel LiMn2O4 powder was also synthesized by the traditional method of solid state reaction. It was found that high-temperature ball milling significantly decreased the synthesis temperature and time. LiMn2O4 with pure spinel phase could be successfully synthesized only by 2 h high-temperature ball milling at 500°C and 600°C. However, pure spinel LiMn2O4 could not be completely synthesized by 2 h solid state reaction at 800°C. The LiMn2O4 particles prepared by high-temperature ball milling are nano-sized (<100 nm) and much smaller than that prepared using solid state reaction. The electrochemical tests results indicated that the as-synthesized LiMn2O4 by 2 h high-temperature ball milling at 600°C showed a favorable initial discharge capacity of 124.2 mAh g−1 at current rate of 0.1 C and still retained a capacity of 119.8 mAh g−1 at 0.1 C after 80 continuous cycles from 0.1 to 2.0 C.
               
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