摘要
通过对掺铋二氧化锰纳米粉体的循环伏安行为的研究，讨论了掺杂Ｂｉ－ＭｎＯ２纳米电极的充放电机理。Ｂｉ（Ⅲ）的掺入完全改变了ＭｎＯ２电极的放电机理，但掺杂Ｂｉ－ＭｎＯ２纳米电极与常粒Ｂｉ－ＭｎＯ２电极的放电机理是类似的。在充放电的过程中，均形成一系列不同价态的Ｂｉ－Ｍｎ复合物，通过这些复合物的共还原和共氧化，有效地抑制电化学惰性物质Ｍｎ３Ｏ４的生成，从而极大地改善了电极的可充性能。ＭｎＯ２氧化度高的电极，其活性也大，但在充放电过程中形成Ｂｉ－Ｍｎ复合物之后，差别逐渐缩小。
Cyclic voltammetry performance of bismuth doped manganese dioxide nanophase powders was studied to discuss its discharge mechanism.It has been concluded that charge-discharge mechanism of MnO 2 has been changed because of the doped bismuth(Ⅲ)but discharge mechanism of nanophase Bi-MnO 2 was similar to that of normal Bi-MnO 2.The beneficial effect of the presence of Bi atoms on the rechargeability of MnO 2 could be explained that Bi(X)(X=0 or Ⅲ)and Mn(Y)(Y=Ⅳ,Ⅲ or Ⅱ)atoms formed stable complexes.These complexs could be cooxided and coreduced and thus restrained the formation of poorly electroactive Mn 3O 4 which was the main cause of irreversibility.As the result,the rechargeablity of MnO 2 electrode was remarkably improved.
出处
《电池》
CAS
CSCD
北大核心
1999年第3期93-96,共4页
Battery Bimonthly
关键词
纳米粉体
掺铋
二氧化锰
锇锰复合物
电极
Nanophase Powders Bismuth Doped Manganese Dioxide Discharge Mechanism Bi-Mn Complex Cyclic Voltammetry Performance
