球形氢氧化镍同时掺杂Co、Zn的研究  

Study on dopping spheric nickel hydroxides with cobalt and zinc

作　　者：陈腾飞[1] 黄伯云[1] 贺万宁[2] 王利君[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]长沙矿冶研究院冶金材料研究所,湖南长沙410012

出　　处：《湘潭矿业学院学报》2001年第3期51-54,共4页Journal of Xiangtan Mining Institute

基　　金："8 63"新材料领域资助项目 (Z32 -1 6)

摘　　要：从结构上分析了同时掺杂Co、Zn的作用机理 ,并改变Zn的加入方式 ,制备并检测了Ni(OH) 2 的部分物理性能 .结果表明 :化学共沉淀法掺杂Co、Zn ,因Ni2 + 、Co2 + 、Zn2 + 的氢氧化物能形成固溶体 ,使电极缺陷浓度增加 ,导电性提高 ,Zn为定价元素 ,充放电时能稳定活性物质的晶体结构 ,对抑制过充时形成γ NiOOH有利 ;Zn以ZnO2 -2 的方式引入反应器 ,与以Zn2 + 引入反应器相比 ,所得氢氧化镍的BET比表面、d0 0 1、FWHM0 0 1和FWHM10 1值明显增大 ,晶粒减小 ,活性物质利用率提高 ,为制备高活性球形氢氧化镍探索了一条新途径 .图 3 ,表 1,参The functional mechanism of Co and Zn on spheric nickel hydroxides was analyzed in the viewpoint of structure. Spheric nickel hydroxides were prepared with the change of dopping way of zinc and its physical properties were partly determined. The results show that chemical co deposition of Co and Zn with Ni can increase the defect content and improve electric conductivity because the hydroxides of Co 2+ ?Zn 2+ ?Ni 2+ can form solid solution under suited conditions. Zinc is an element with stable bond value, which can stabilize the crystal structure of the active materials of Ni(OH) 2 when charging and discharging and is effective in preventing forming γ NiOOH . Zinc, when dopping in the form of ZnO 2- 2 to reactor, can obtain spheric Ni(OH) 2 with larger value of d 001 ,FWHM001 and FWHM101, smaller crystal grains and higher electrochemical activity than that of Ni(OH) 2 dopping Zn in the way of Zn 2+ .3figs.,1tab.,10refs.

关 键 词：球形氢氧化镍 掺杂 化学共沉淀法 固溶体 钴 锌 作用机理 电化学 镍氢电池 

分 类 号：TN912.2[电子电信—通信与信息系统]