非水介质中Zn-MnO_2的可充性研究

Rechargeability of Zn MnO 2 in Non aqueous Electrolyte

报道了以尖晶石型二氧化猛（λ－ＭｎＯ２）为正极，１ｍｏｌ·Ｌ－１Ｚｎ（ＣｌＯ４）２的碳酸丙烯酯为电解液构成Ｚｎ－ＭｎＯ２二次电池体系的充放电性质和反应机理分析．结果表明，这一体系的充放电过程表现为Ｚｎ在λ－ＭｎＯ２中的电化学嵌入和脱嵌反应．在ｘ≤０．５的范围内，ＺｎｘＭｎ２Ｏ４的尖晶石结构稳定，Ｚｎ的嵌脱反应可逆性良好．由此构成的模拟电池显示出良好的循环寿命（＞２００次）和较高的充放电效率（＞９０％）．

A novel Zn MnO 2 battery ststem by use of spinel related MnO 2 as positive electrode and Zn(ClO 4) 2 in propyl carbonate as electrolyte was constructed and its charge discharge behaviour was studied. The results show that the cell reaction of the system proceeds through the electrochemical intercalation of zinc into the crystalline lattice of MnO 2 to form Zn x Mn 2O 4 . At x≤0.5 , Zn x Mn 2O 4 remains its spinel structure stable and exhibits high reversibility for zinc intercalation. As a result, the battery system demonstrates excellent cycleability (>200 cycles), higher discharge charge efficiency (>90%) and prolonged storage life.