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Well-defined spinel LiMn_2O_4 powders were synthesized via sintering a precursor,which was prepared by spray- drying method.The effects of sintering process on the structure and electrochemical properties of LiMn_2O_4 were discussed.It was found that a single sintering could not synthesize a pure LiMn_2O_4 compound,while two-step sintering procedure consisting of decomposing sprayed precursors at 350℃and further sintering at an elevated temperature leads to the formation of a single-phased LiMn204 with homogeneous particle size distribution.As compared to that sintered in air,the two-step sintered LiMn204 in oxygen shows tighter structure and more uniform particle size,as well as better electrochemical properties.It delivers an initial discharge capacity of 131 mAh.g~(-1)(1/10C),and still has excellent cycling stability at higher rate(1/5C).
Well-defined spinel LiMn 2 O 4 compounds were synthesized via sintering a precursor, which was prepared by spray-drying method. These effects of sintering process on the structure and electrochemical properties of LiMn 2 O 4 were discussed. It was found that a single sintering could not synthesize a pure LiMn 2 O 4 compound, while two-step sintering process consisting of decomposing sprayed precursors at 350 ° C and further sintering at an elevated temperature leads to the formation of a single-phased LiMn 204 with homogeneous particle size distribution. As compared to that sintered in air, the two -step sintered LiMn204 in oxygen shows the tighter structure and more uniform particle size, as well as better electrochemical properties. It delivers an initial discharge capacity of 131 mAh.g -1 (1/10 C), and still has excellent cycling stability at higher rate (1 / 5C).