SmO对氢镍电池镍电极性能的影响

Effect of SmO on Performance of Ni(OH)_2 Electrode

通过对模拟电池进行恒流充放电、交流阻抗等测试和析气实验,研究了在亚镍中掺杂氧化钐SmO对镍电极电化学性能的影响。结果表明,掺杂氧化钐SmO的质量分数在1.0%时,镍电极的电化学阻抗变小,提高了镍电极电化学活性、高温性能与充电效率,能够有效抑制充电过程中氧的产生,在室温条件下以0.2C充放电时,掺杂SmO镍电极的放电比容量为138.04 mAh.g-1,比空白镍电极提高了23.01%;50℃下1C充放电时,放电比容量为90.313 mAh.g-1,较未添加氧化钐提高8.69%。

The effect of SmO on the performance of Ni （OH） 2 electrode was studied by galvanostatic charge/ discharge, electrochemical impedance spectroscopy and gas evolution experiment. The results showed that ance of Ni （OH）2 electrode smaller, improved the ac- tivity, the elevated temperature performance and the charge efficiency of the electrode and restrained the e- volution of oxygen. When the percentage of added the addition of SmO made the electrochemical imped- SmO was 1.0% , the discharge time of the added SmOelectrode was 2. 465 h at room temperature at 0.2C charge and 0.2C discharge, the discharge specific was capacity 138. 04 mAh ·g-1, increased by 23. 01% compared with Ni （OH）2 electrode. When charged and discharged at 1C at 50℃, the discharge specific capacity was 90. 313 mAh .g-1, 8.69% higher than that of Ni （OH） 2 electrode.