(浙江工业大学 化工与材料学院，杭州 310014)
摘 要: 采用均匀沉淀法制备20%Al取代的α-Ni(OH)2，研究表面活性剂、镍盐浓度、pH值等因素对α-Ni(OH)2微结构和电化学性能的影响。结果表明：控制合适的合成条件，可以获得片厚约为10~20 nm、具有片状微观结构的α-Ni(OH)2粉末；采用CoO作为添加剂时，优化条件下合成的α-Ni(OH)2的放电容量接近390 mA·h/g；与β-Ni(OH)2相比，合成的片状α-Ni(OH)2具有充电电压低、放电电压高及放电容量大的特点。循环伏安测试表明，α-Ni(OH)2电极具有更好的可逆性。
关键字: α-Ni(OH)2；片状结构；均匀沉淀法；电化学性能
（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
