摘要
采用微乳液快速冷冻沉淀法制备非晶态Ni(OH)2.通过单因素及正交实验研究反应体系的pH值、反应温度和时间等因素对制备的非晶态Ni(OH)2电化学性能的影响.结果表明,主要影响因素为pH值,其次为反应温度和时间.采用TX-100/正丁醇/环己烷/水体系,控制TX-100与正丁醇的体积比为1:15,W值(水与表面活性剂质量比)为15.1,pH为12,反应时间2h,反应温度55℃的条件下进行反应,放入0～5℃的超低温恒温槽中快速冷冻沉淀,合成出Ni(OH)2非晶相粉体电极活性材料,该材料的放电比容量达333.22mA-h/g,具有较高的电化学容量.初步探讨了微乳液快速冷冻沉淀法制备非晶态Ni(OH)2粉体的作用机理.
Amorphous nickel hydroxide powder was prepared by the method of micro-emulsion deepfreezing deposition. By orthogonal tests of experimental conditions, the effects of pH, reaction temperature and time on the electrochemical activity of the amorphous Ni（OH）2 were examined. It was found that the main influential factor was pH value of solution, secondly reaction temperature and time. Amorphous nickel hydroxide powder was preparcd in a TX-100/butanol/cyclohexane/water system under the optimal conditions of the volume ratio of TX-100 to butanol 1：15, mass ratio of water to surfactant 15.1 or so, pH of 12, reaction time 2 h at 50~60~C, the precipitate was then rapidly frozon at 0-5 ℃. Discharge specific capacity of the amorphous nickel hydroxide powder as electrode active material could reach as high as 333.22 mA-h/g. In addition, the mechanism of the method of micro-emulsion decpftcczing deposition was also discussed.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2007年第3期551-555,共5页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20563001)
