Cu(Ⅱ)和Fe(Ⅲ)掺杂非晶相Ni(OH)_2的结构与电化学性能

Structure and Electro-Chemical Performance of Amorphous Ni(OH)_2 Multiplex Doping with Cu(Ⅱ)and Fe(Ⅲ)

采用微乳液快速冷冻沉淀法制备Cu(Ⅱ)和Fe(Ⅲ)复合掺杂的非晶相氢氧化镍。利用XRD、SEM、EDS、Raman光谱测试分析样品的结构形态,同时将其作为正极活性材料组装成MH-Ni电池,测试其电化学性能。测试结果表明,Cu(Ⅱ)和Fe(Ⅲ)较好的溶于Ni(OH)2的微结构内部,样品粉体材料微粒均匀,微结构无序性强、缺陷较多。在制备体系采用在55℃、pH=11,搅拌反应2 h的工艺条件下,复合掺杂比Fe为3%、Cu为5%(质量分数)所制备样品合成的电极,在80 mA/g恒电流充电5 h,40 mA/g恒电流放电,终止电压为1.0 V的充放电制度下,其首次放电比容量达353.82 mAh/g,放电平台为1.268 V,电极材料结构稳定,循环可逆性良好,表现出较高的电化学活性。

Amorphous nickel hydroxide powder multiplex doping Cu（ Ⅱ ）and Fe （ Ⅲ ） are prepared by micro emulsion deepfreeze deposition method. The structures of the powder are analyzed by XRD, SEM, EDS and Raman spectroscopy. The electrochemical properties of the powder are charactered by charge-discharge tests and cyclic voltammeter characteristic. The samples stability and reversibility are good. The experimental results show that the charged efficiency increases. The discharge specific capacity is 353.82 mAh/g and the voltage plateau is at 1. 268 V when t =55 ℃ ,pH = 11. The content of Fe is 3% and Cu is 5% （wt） under the charging current and time. The discharging current and the end potential are respectively 80 mA/g,5 h,40 mA/g and 1.0 V. Thus electrochemical performance of Ni （OH）2 is improved obviously.