铁取代氢氧化镍制备、结构与电化学性能Ⅱ结构分析  

Preparation, structure and electrochemical performance of iron substituted nickel hydroxide

作　　者：冷拥军[1] 马紫峰[1] 张存根[1] 张鉴清[2] 吴益华[1] 曹楚南[2] 

机构地区：[1]上海交通大学化学化工学院,上海200240 [2]浙江大学化学系,浙江杭州310027

出　　处：《电源技术》2000年第1期32-35,共4页Chinese Journal of Power Sources

基　　金：上海交通大学科技基金!资助项目 (交财A 2 762 )

摘　　要：αNi(OH)2由于具有高的理论比容量,而且过充时不会发生镍电极的膨胀,有可能作为高性能镍电极的电极材料。采用化学共沉淀方法制备了Fe取代氢氧化镍,讨论了取代Fe含量对Fe取代氢氧化镍相结构的影响,并从结构分析方面解释了样品的电化学性能。XRD分析表明,Fe取代量不同,样品的相结构亦不同。当Fe取代量为19.1%以上时,样品为单一的α相;当Fe取代量为1.9%或不取代时,样品为单一的β相为主。当Fe取代量为6.4%和12%时,样品为混合相结构,前者β相为主,后者α相为主。α相样品在强碱中陈化结构稳定,不会转变成β相。IR光谱分析表明,要维持稳定的α相,在层间间隙内需插入一定量的阴离子如CO2-3。Ni(OH) 2 is of great interest since it is likely to have high specific capacity, moreover, minimizes the problems of nickel expansion. Iron substituted nickel hydroxides have been prepared by chemical co precipitation with iron substitution rates ranging from 0 to 0.40. Effect of iron substitution on phase structure was investigated in detail. XRD analysis shows that with different amount of iron substitution, different phases present. When the amount of iron substitution exceeds 19.1%, only α phase, with which nickel hydroxides are stable in strong alkaline solution, presents in the sample. On the contrary, when the amount of iron substitution is as low as 1.9% or non, only β phase presents in the sample. While the amount of iron substitution is 6.4% or 12%, both β phase and α phase present. However, β phase dominates in the sample with the former substitution amount as well as α phase does in another sample. IR study shows that it is necessary to intercalate some anion, such as CO 2- 3, between Ni(OH) 2 slabs in order to keep the α phase stable.

关 键 词：取代氢氧化镍 相结构 电化学 铁 结构分析 电极 

分 类 号：TM910.3[电气工程—电力电子与电力传动]