Ni(OH)2电极交流阻抗与放电容量的关系

利用交流阻抗和恒电流充放电技术研究了Ni(OH)2电极交流阻抗与放电容量的关系.分析了球形Ni(OH)2电极极化过程的动力学和阻抗特征,并应用数理统计方法研究了镍电极的电荷转移电阻和质子扩散阻抗对电极放电容量的影响.研究表明:放电容量与不同荷电状态的电荷转移电阻和质子扩散阻抗的相关性不同,在全放电态时放电容量与上述阻抗的相关性最强,均表现为负相关,但放电容量与质子扩散阻抗的相位角正相关.

Relationship of AC impedance and discharge capacity for Ni(OH)2 electrode

AC impedance and constant current charge-discharge technologies were applied to study the relationship of AC impedance and discharge capacity for Ni(OH)_2 electrode. The kinetic course and the impedance characteristics of the polarization of the electrode were analysed,and the effect of charge transfer resistance and proton diffusion impedance on the discharge capacity of the electrode were discussed with statistic method. It was proved that the effects were different for nickel electrodes in different states of charge.For full discharged electrode, the relativity of the discharge capacity to charge transfer resistance and proton diffusion impedance were the largest one with the highest trust, both of which showed negative.But the relativity of the discharge capacity to the phase angle of proton diffusion impedance for nickel electrode was positive.