Abstract
Several doped spinel-type Li–Mn oxides of formula LiMn 2− x M x O 4, where Mn is partly replaced by Co, Cu, Ga, were prepared by the Pechini method in the range of 700–850 °C for 4 h. Even substitution levels as low as 0.1 atom/formula unit produces structural effect that resulted in high cycle performance. The cylcleability maintained regardless of synthesis temperature or powder size. It is suggested that high Mn Valence State by doping significant effect on cylcleability. Also, Spinel lithium manganese oxides with a nominal composition of LiMn 2O 4 are prepared by using conventional ceramic synthesis method and are coated by a chemical deposition method of Ag particles onto LiMn 2O 4 powder. The Ag nano-particle coated LiMn 2O 4 showed excellent cycleability at 2 C galvano-static condition. The results indicated that the surface treatment on cathode powder also should be an effective way to improve cyclelife and high current retention. This work aims to elucidate electrochemical properties by doping and coating.
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