λ-MnO_2在碱性电液中的电化学性质研究  

Study on the electrochemical performance of λ MnO 2 in alkaline solution

作　　者：夏熙[1] 孙巍伟[1] 

机构地区：[1]新疆大学化学系

出　　处：《电源技术》1999年第A03期74-76,共3页Chinese Journal of Power Sources

摘　　要：通过恒电流放电、循环伏安、循环充放电、ＸＲＤ等实验技术研究了λ－ＭｎＯ２在９ｍｏｌ／ＬＫＯＨ中的电化学性质。结果表明λ－ＭｎＯ２的放电曲线与ＥＭＤ放电曲线基本相似，开路电压较高，但工作电压较ＥＭＤ的低，容量也稍低，但远较β－ＭｎＯ２高。放电区间质子的扩散过程与ＥＭＤ基本相似，扩散机理未发生明显的变化，因而λ－ＭｎＯ２在碱性溶液中的放电机理为质子嵌入机理，放电产物为β－ＭｎＯＯＨ。Constant current discharge,XRD,CV and charge/discharge cyclic techniques were used to study the electrochemical performances of λ MnO 2 in 9mol/L KOH.The results show that the discharge curve is fundamentally the same as EMD,the open circuit voltage is higher,the working voltage and capacity are lower than the EMD,but is far higher than β MnO 2.XRD results also indicate that the discharge mechanism of λ MnO 2 in 9mol/L KOH electrolyte is H + ion diffusion mechanism.After intercalation in the different sites of oxygen atoms in the crystal of λ MnO 2,the covalent bonds and isotropic chemical bond force enable the 3 demension network structure for λ MnO 2 to change into 2 demension layer structure β MnOOH in the range of 1e discharge.

关 键 词：Λ-MNO2 碱性溶液 电化学性质 蓄电池 

分 类 号：TM912[电气工程—电力电子与电力传动]