摘要
采用TX-100/正己醇/正庚烷微乳体系合成了纳米Ni(OH)2,并研究了不同的水热处理温度和处理时间对样品性能的影响。通过X射线衍射(XRD)、热重(TG)、恒流充放电、电化学阻抗研究了纳米Ni(OH)2的结构和电化学性能。实验结果表明:随着水热处理时间延长,样品的结晶性提高,D001先减小后增大,而D100则逐渐增大;与未处理的样品相比,140℃水热处理1h后的样品0.2C放电比容量提高了28.4mAh/g,1C容量保持率增加23.3%,而且,其热分解温度仅为286℃,具有良好的电化学活性。
Nano-Ni（OH）2 was synthesized in the triton X/n-hexanol/n-heptane micro-emulsion system in this paper. And the effects of hydrothermal treatment temperature and time on the properties of nano-Ni （OH）2 samples were studied. The structure and electrochemical properties for nano-Ni（OH）2 samples were characterized by X-ray diffraction, thermogravimetrie analysis, constant-current charge/discharge, electrochemical impedance. The results showed that, with the increasing of hydrothermal treatment time, the crystallization of nano-Ni （OH）2 was improved, its D001 decreased first and then increased, and D100 gradually increased. Compared with untreated nano-Ni （OH）2, the discharge specific capacity of the sample after hydrothermal treatment at 140℃ for 1 h ,increased by 28.4 mAh/g at 0.2C and specific capacity retention increased by 23.3% at 1C. As decomposition temperature was only of 286℃, it had good electrochemical activity.
出处
《电池工业》
CAS
2008年第6期397-400,共4页
Chinese Battery Industry
