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.
出处
《电化学》
CAS
CSCD
北大核心
2008年第1期83-86,共4页
Journal of Electrochemistry
基金
河南省教育厅(2007530009)资助
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
nickel/metal-hydride battery
foam nickel electrode
cobalt oxyhydroxide conductive network
oxidation method
