La掺杂Al代α-Ni(OH)_2电极材料的性能  

Properties of La Doped Al-substituted α-Ni(OH)_2 Electrode Material

作　　者：刘长久[1] 赵卫民[1] 陈世娟[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：《过程工程学报》2010年第2期385-389,共5页The Chinese Journal of Process Engineering

基　　金：广西科学研究与技术开发计划基金资助项目(编号:桂科基073101)

摘　　要：采用尿素均相沉淀法制备了La掺杂Al代α-Ni(OH)2粉体材料,表征了其微观结构和形貌,并测试了样品作为MH-Ni电池正极活性材料的电化学性能.结果表明,制备的样品颗粒呈类球形,与Al代α-Ni(OH)2相比,结晶度增强,具有更大的晶格层间距,电极反应具有更好的可逆性和较小的电化学阻抗,在0.1C下放电比容量达403.04mA·h/g,放电中值电压较高并稳定于1.29V,1C下放电比容量达343.47mA·h/g,充放电循环50次容量保持率为90.31%,显示了良好的较大倍率放电性能.The La doped Al-substituted α-nickel hydroxide electrode material was prepared by homogeneous precipitation method with urea.Its structure and morphology were characterized,and electrochemical performance investigated.The results show that the La doped Al-substituted particles have a sperical shape and their surface is rough.The sample has a relatively larger interlayer distance and better crystallinity compared with the Al-substituted sample.At 0.1 C charge-discharge rate,the discharge specific capacity of La doped sample reaches 403.04 mA·h/g,simultaneously its discharge mediate potential is higher and maintained at 1.29 V.In addition,the discharge specific capacity of the sample reachs 343.47 mA·h/g at 1 C rate,and the capacity still remains 90.31% after 50 cycles.The La doped Al-substituted α-nickel hydroxide has better high-rate discharge performance.

关 键 词：均相沉淀 Al代α-Ni(OH)2 LA掺杂 结构特征 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]