氧化方式对发泡镍电极中CoOOH导电网络稳定性的影响  

Effects of Oxidation Methods on the Stability of CoOOH Conductive Network in Foam Nickel Electrodes

作　　者：李晓峰[1] 魏彦伟[1] 董会超[1] 

机构地区：[1]郑州轻工业学院材料与化工学院,河南郑州450002

出　　处：《电化学》2008年第1期83-86,共4页Journal of Electrochemistry

基　　金：河南省教育厅(2007530009)资助

摘　　要：应用化学氧化(CO)和电化学氧化法(EO)于发泡式镍电极中引入CoOOH导电网络.循环伏安和X射线衍射法研究其还原氧化行为.实验表明,由化学氧化法制备的CoOOH(CO),其电化学还原氧化反应的可逆性优于CoOOH(EO);当镍电极的电位被强制性降低时,前者的结构能够保持稳定.因此,金属氢化物-镍电池经过强制性过放电储存后,于镍电极中引入CoOOH(CO)导电网络的电池容量保持率达到97.7%,而引入CoOOH(EO)导电网络的电池仅为81.4%.Two kinds of the cobalt oxyhydroxide conductive networks in foam nickel electrodes were prepared by different methods i.e. the electrochemical-oxidation （EO） and chemical-oxidation （CO） and which redox behaviors were studied by using cyclic vohammetry and X-ray diffraction measurements. The results show that the CoOOH（CO） has better redox reversibility than CoOOH（EO） and the structure of the former can be kept when nickel electrodes are subjected to a negative potential. Thus, 98.7% capacity retention is demonstrated on nickel/metal-hydride batteries with CoOOH （CO） conductive network after being imposed over-discharge state storage; on the contrary, only 83.3% capacity retention is found on the batteries with CoOOH （EO） conductive network.

关 键 词：金属氢化物-镍电池 发泡镍电极 CoOOH导电网络 氧化方式 

分 类 号：TM911[电气工程—电力电子与电力传动]