With manganese sulfate as raw material and hexadecyl trimethyl ammonium bromide as modifier,trimanganese tetroxide was synthesized by complex-precipitation method,with which lithium manganate cathode material was then synthesized by high-temperature solid-state reaction.The effects of modifier amount on the morphology and particle size of trimanganese tetroxide and the specific discharge capacity of lithium manganate cathode material were all discussed.Results show that serious particle agglomeration can occur in the trimanganese tetroxide synthesized without modifier.With 3.0 g/L hexadecyl trimethyl ammonium bromide as the modifier,the synthesized trimanganese tetroxide has uniform particle size,and is dispersed without any agglomeration.Spinel lithium manganate was synthesized with the self-made modified trimanganese tetroxide,and then compared with the spinel lithium manganate synthesized with three kinds of trimanganese tetroxide available on the market.The results show that the lithium manganate synthesized with the self-made modified trimanganese tetroxide can present better electrochemical performance,delivering an initial discharge capacity of 120.43 mAh/g,with a retention rate of 96.79％after 50 cycles at 1C.
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