(浙江工業(yè)大學(xué) 化工與材料學(xué)院，杭州 310014)
摘 要: 采用均勻沉淀法制備20%Al取代的α-Ni(OH)2，研究表面活性劑、鎳鹽濃度、pH值等因素對(duì)α-Ni(OH)2微結(jié)構(gòu)和電化學(xué)性能的影響。結(jié)果表明：控制合適的合成條件，可以獲得片厚約為10~20 nm、具有片狀微觀結(jié)構(gòu)的α-Ni(OH)2粉末；采用CoO作為添加劑時(shí)，優(yōu)化條件下合成的α-Ni(OH)2的放電容量接近390 mA·h/g；與β-Ni(OH)2相比，合成的片狀α-Ni(OH)2具有充電電壓低、放電電壓高及放電容量大的特點(diǎn)。循環(huán)伏安測(cè)試表明，α-Ni(OH)2電極具有更好的可逆性。
關(guān)鍵字: α-Ni(OH)2；片狀結(jié)構(gòu)；均勻沉淀法；電化學(xué)性能
（College of Chemical Engineering and Material Science, Zhejiang University of Technology, Hangzhou 310014, China）
Abstract:20% Al-substituted α-Ni(OH)2 was synthesized by a co-precipitation method, and the effects of surfactants, Ni2+ concentration and pH value on the microstructure and electrochemical properties of the as-prepared α-Ni(OH)2 were investigated. The results show that a special flaky α-Ni(OH)2 with thickness of 10~20 nm can be obtained under the optimum conditions. The discharge capacity of the as-prepared α-Ni(OH)2 powder approximates to 390 mA·h/g using CoO as additive. Compared with β-Ni(OH)2, the as-synthesized flaky α-Ni(OH)2 has the lower charge potential pleateau, higher diacharge potential pleateau and larger discharge capacity. The results of cyclic voltammogram measurements also show that the as-synthesized α-Ni(OH)2 has better electrochemical reversibility.
Key words: α-Ni(OH)2; flaky structure; coprecipitation method; electrochemical properties
