Structure and electrochemical performance of Cu singly doped and Cu/Al co-doped nano-nickel hydroxide  

Cu单掺杂和Cu/Al复合掺杂纳米氢氧化镍的结构和电化学性能(英文)

作　　者：包杰[1] 朱燕娟[1] 庄义环[1] 许庆胜[1] 赵汝冬[1] 刘泳林[1] 钟浩良[1] 

机构地区：[1]广东工业大学物理与光电工程学院,广州510006

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第2期445-450,共6页中国有色金属学报（英文版）

基　　金：Project (10774030) supported by the National Natural Science Foundation of China;Project (S2012010009955) supported by the Guangdong Province Natural Science Foundation of China;Project (12C232111916) supported by the Science and Technology Program of Guangzhou City of China

摘　　要：Nanometer Cu singly doped and Cu/Al co-doped nickel hydroxides were synthesized by ultrasonic-assisted precipitation method. Their crystal structure, particle size, morphology, tap density and electrochemical performance were investigated. The results show that the samples have a-phase structure with narrow particle size distribution. Cu singly doped nano-Ni（OH）2 contains irregular particles, while Cu/Al co-doped nano-Ni（OH）2 displays a quasi-spherical shape and has a relatively higher tap density. Composite electrodes were prepared by mixing 8% （mass fraction） nanometer samples with commercial micro-size spherical nickel. The charge/discharge test and cyclic voltammetry results indicate that the electrochemical performance of Cu/Al co-doped nano-Ni（OH）2 is better than that of Cu singly doped nano-Ni（OH）2, the former＇s discharge capacity reaches 330 mA.h/g at 0.2C, 12 mA.h/g and 91 mA.h/g larger than that of Cu singly doped sample and pure spherical nickel electrode, respectively. Moreover, the proton diffusion coefficient of Cu/Al co-doped sample is 52.3% larger than that of Cu singly doped sample.采用超声波辅助沉淀法制备Cu单掺杂和Cu/Al复合掺杂的纳米Ni(OH)2样品,测试样品的晶相结构、粒径、形貌、振实密度及电化学性能。结果表明,样品均具有α相结构且其平均粒度的分布范围窄,Cu单掺杂的纳米Ni(OH)2呈现不规则形态,而Cu/Al复合掺杂的纳米Ni(OH)2呈准球状且具有更大的振实密度。将纳米样品以8%的比例掺入到商业用微米级球形镍中制成混合电极。充放电和循环伏安测试结果表明,Cu/Al复合掺杂纳米Ni(OH)2的电化学性能优于Cu单掺杂的纳米Ni(OH)2的,前者的放电比容量最高达到330mA·h/g(0.2C),比Cu单掺杂样品的高12mA·h/g,比纯球镍电极的高91mA·h/g。此外,Cu/Al复合掺杂纳米样品的质子扩散系数比Cu单掺杂样品的高52.3%。

关 键 词：nano-Ni（OH）2 ultrasonic-assisted precipitation doping electrochemical performance 

分 类 号：TB383.1[一般工业技术—材料科学与工程]