添加有NiOOH的混合晶型Ni(OH)_2的电化学性能研究  

Electrochemical Performance of Multiphase Ni(OH)_2 Added with NiOOH

作　　者：袁国霞[1] 黄可龙[1] 刘素琴[1] 仲晓玲[1] 

机构地区：[1]中南大学化学工学院,长沙410083

出　　处：《无机材料学报》2010年第10期1099-1104,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(50772133)~~

摘　　要：采用络合沉淀法制备了具有特殊表面纳米片状结构的微米级混合晶型氢氧化镍,并研究了添加化学氧化NiOOH纳米颗粒对上述材料电化学性能的影响.采用SEM、XRD等手段表征了样品的形貌及物相特征,并考察了其作为镍氢电池正极活性材料的电化学性能.结果表明:添加的纳米片状β-NiOOH随机分布在氢氧化镍表面.以制备的样品为正极材料组装成镍氢模拟电池,在0.2C充放电条件下,制备材料的放电比容量可达306mAh/g;添加NiOOH能有效地改善镍电极的电化学性能,添加量为7wt%时,0.2C充放电条件下样品放电比容量为326mAh/g,在2C充放电条件下放电比容量可达311mAh/g.Micron-size multiphase nickel hydroxides with nanosheets structure were synthesized by coordination homogeneous precipitation method.Chemically oxidized NiOOH nanoparticles were added subsequently in order to improve their electrochemical performance.The samples were characterized by XRD and SEM.The results show that the NiOOH particles with flake-like morphology are dispersed randomly on the surface of the multiphase Ni（OH）2.The simulated Ni/MH battery with the multiphase Ni（OH）2 as positive active material has the discharge capacity of 306 mAh/g at 0.2C charge/discharge rate.The existence of chemically oxidized NiOOH in the nickel electrode exert great effect on the improvement of electrochemical performance.The discharge capacity of the sample added with 7 wt% NiOOH reaches 326 mAh/g at 0.2C and 311mAh/g at 2C.

关 键 词：氢氧化镍 羟基氧化镍 化学氧化 

分 类 号：TM912[电气工程—电力电子与电力传动]