CTAB辅助二次水热法合成o-LiMnO_2微米棒及其电化学性能

CTAB assisted synthesis of o-LiMnO_2 microrods and its electrochemical performance

通过十六烷基三甲基溴化铵(CTAB)辅助二次水热法合成了o-LiMnO_2微米棒。首先以KMnO_4和CTAB为原料合成了γ-MnOOH微米棒,然后再以γ-MnOOH为前驱物在LiOH溶液中通过第2步水热反应制备出表面粗糙的o-LiMnO_2微米棒。实验结果表明:当第2步水热反应温度为200℃、时间为15 h、n(Li)∶n(Mn)=12∶1时所得样品的电化学性能最优。该样品在电流密度为30、200 mA·h·g^(-1)时最大放电容量分别达到220、117 mA·h·g^(-1),且经过40次循环后放电容量仍高达176、112 mA·h·g^(-1),表现出较好的循环稳定性和倍率性能。

o-LiMnO2 microrods were prepared by a CTAB assisted two-step hydrothermal route.In the first step γ-MnOOH microrods were prepared using KMnO4 and CTAB as raw materials.And then γ-MnOOH microrods were hydrothermal treatment with the LiOH solution to produce the o-LiMnO2 microrods with rough surfaces.The result showed that the sample which was secondly heated at 200 ℃ for 15 h and n（Li）：n（Mn）=12：1 displayed a good electrochemistry performance.At the current density of 30 mA·h·g^-1 and 200 mA·h·g^-1,the sample demonstrated the maximum discharge capacity of 220 mA·h·g^-1 and 117 mA·h·g^-1,respectively.After 40 cycles,the sample still delivered a high capacity of 176 mA·h·g^-1 and 112 mA·h·g^-1 with a better cycling and rate performance.