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为了考察Ni(OH)_2颗粒粒径与形貌对镍电极性能的影响,利用超声波沉淀法制备出了粒径小且分布均匀的球形氢氧化镍,研究了反应体系中超声波强度对氢氧化镍颗粒形貌的影响。利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、粒度分析、循环伏安特性曲线、倍率充放电技术对制备的氢氧化镍材料进行表征与测试。结果表明,超声波强度对氢氧化镍颗粒形貌有显著影响,实验确定适宜的超声波强度在216 W左右;粒度分析显示制备的球形氢氧化镍颗粒粒度在10μm左右。XRD测试证明制备的氢氧化镍为β-Ni(OH)_2;循环伏安特性曲线和倍率充放电测试发现,该材料具有良好的循环保持率,在0.4 C充电3 h,静置3 min,1 C放电至1.2 V的测试条件下循环30次后循环保持率为89%,最大放电比容量达260 m Ah/g。
In order to investigate the effect of Ni (OH) 2 particle size and morphology on the performance of nickel electrode, spherical nickel hydroxide with small particle size and uniform distribution was prepared by ultrasonic precipitation method. The effects of ultrasonic intensity on nickel hydroxide Effect of particle morphology. The prepared nickel hydroxide material was characterized and tested by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), particle size analysis, cyclic voltammetry curve and rate charge-discharge technique. The results show that the ultrasonic intensity has a significant effect on the morphology of nickel hydroxide particles. The optimum ultrasonic intensity is about 216 W. The particle size analysis shows that the size of the spherical nickel hydroxide particles is about 10 μm. XRD results showed that the prepared nickel hydroxide was β-Ni (OH) _2. The cyclic voltammetry and charge-discharge test showed that the material had a good cycle retention, which was kept for 3 h at 0.4 C for 3 min, 1 C discharge to 1.2 V under the test conditions 30 cycles after the cycle retention was 89%, the maximum discharge capacity of 260 m Ah / g.