论文部分内容阅读
分别采用共沉淀法和超声波共沉淀法制备Al/Co复合掺杂α-Ni(OH)2样品A和B,用XRD和激光粒度仪表征样品的晶相结构和粒度分布。结果表明,样品B比样品A具有较多的晶格缺陷和较小的平均粒径。循环伏安特性及电化学阻抗谱测试显示,样品B比样品A具有更好的电化学性能:较好的反应可逆性、较低的电荷转移电阻和较高的循环寿命等。样品B的质子扩散系数为1.96×10-10cm2/s,约为样品A(9.78×10-11cm2/s)的2倍。充放电测试显示,样品B的放电比容量达到308mA·h/g,比样品A的放电比容量高25mA·h/g。
The Al / Co composite doped α-Ni (OH) 2 samples A and B were prepared by coprecipitation and ultrasonic co-precipitation respectively. The crystal structure and particle size distribution of the samples were characterized by XRD and laser particle sizer. The results show that sample B has more lattice defects and smaller average particle size than sample A. Cyclic voltammetry and electrochemical impedance spectroscopy showed that sample B has better electrochemical performance than sample A: better reaction reversibility, lower charge transfer resistance and higher cycle life. The proton diffusion coefficient of sample B is 1.96 × 10-10cm2 / s, which is about twice of that of sample A (9.78 × 10-11cm2 / s). The charge and discharge tests showed that the specific discharge capacity of sample B reached 308mA · h / g, which was 25mA · h / g higher than the discharge capacity of sample A.