Y(Ⅲ)和Co(Ⅱ)复合掺杂非晶态Ni(OH)_2材料的电化学性能  

Electrochemical Performance of Y(Ⅲ) and Co(Ⅱ) Codoped Amorphous Nickel Hydroxide as Electrode Active Material

作　　者：陈世娟[1] 刘长久[1] 黄良花[1] 

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《桂林理工大学学报》2011年第2期268-272,共5页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(20563001);广西科学研究与技术开发计划项目(桂科能05112001-2A1);广西自然科学基金项目(桂科基0731001);广西教育厅科研项目(桂教科研[2005]47)

摘　　要：采用微乳液快速冷冻共沉淀法制备出Y(Ⅲ)和Co(Ⅱ)复合掺杂非晶态Ni(OH)2电极活性粉体材料样品。采用XRD、SAED、SEM、EDS和Raman光谱对其结构形貌和成分进行表征分析,同时将样品组装成碱性MH-Ni电池,进行了电化学性能测试。结果发现,Y(Ⅲ)和Co(Ⅱ)复合掺杂非晶态Ni(OH)2样品材料内部微结构缺陷较多,无序性强,作为活性物质合成镍电极材料,其在电极反应过程中电荷转移电阻较低,导电能力增强,其样品电极以80 mA.g-1恒流充电6 h,40 mA.g-1恒流放电,终止电压为1.0 V的充放电制度下,放电平台电压为1.278 V,放电容量高达335.7 mAh.g-1。Abstract： Amorphous nickel hydroxide codoped with Y （ Ⅱ ） and Co （ Ⅱ ） is synthesized by micro-emulsion method. The microstructure and composition of the samples are characterized by XRD, SAED, SEM, EDS and Raman. Electrochemical properties are investigated when sample power codoped with Y （ Ⅲ ） and Co （Ⅱ） is made as nickel electrode active material, then the MH-Ni battery assembled. The results show that the sample doped with Y （ Ⅲ ） and Co （ Ⅱ ） is amorphous Ni （OH） 2 with large amount of defects. Electrode made of the sample shows low charge-transfer resistance and strong conductivity. The specific capacity is 355.7 mAh/g and discharged plateau potential is 1. 278 V when the charging current, discharging current and end potential are 80 mAh/g,40 mAh/g and 1.0 V respectively.

关 键 词：微乳液法 Y(Ⅲ) Co(Ⅱ) 复合掺杂 非晶态Ni(OH)2 电化学性能 

分 类 号：TM912.2[电气工程—电力电子与电力传动]