从磷酸二异辛酯-煤油体系反萃制备纳米β-Ni(OH)_2

以磷酸二异辛酯-煤油为萃取体系,通过水热反萃法制备球形纳米级β-Ni(OH)2.采用XRD、TEM和FTIR对样品的物相和形貌进行表征.结果表明,水热反萃法能够制备出均匀分散的球形β-Ni(OH)2,粒径在20~80,nm之间.用制备的β-Ni(OH)2作为镍氢电池正极材料,其电化学测试表明,在室温0.2C下首次放电比容量为285.6,(m A·h)/g;高倍率下具有高的比容量保持率和稳定的循环性,1.0C首次放电的比容量为259.1,(m A·h)/g,是0.2C放电比容量的90.7%,在循环58次后比容量为252.1,(m A·h)/g.

Preparation of Nano-p-Ni （OH） 2 by Stripping Method from Di （isooctyl） phosphate-Kerosene System

Spherical nano-β-Ni（OH）2 was prepared by a novel hydrothermal stripping method with di（isooctyl） phosphate-kerosene system. The as-synthesized sample was characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）and Fourier transform infrared spectrometer（FTIR）. The results show that the samples synthesized by this method are uniform distribution and the particle size ranges from 20 nm to 80 nm. The electro- chemical performance was studied with the nano-β-Ni （OH） 2 prepared as the cathode materials of nickel-hydride batteries. The results show that the first discharge specific capacity of the samples is 285.6 （mA · h）/g at 0.2C. At the high charge/discharge rate it can obtain high retention rate of specific capacity and steady cycle performance. The discharge specific capacity at 1.0C is 259.1 （mA· h）/g, which is 90.7% of that at 0.2C, and it can keep 252.1 （mA· h）/g after 58 cycles.