Li/SOCl_2电池的交流阻抗研究

AC impedance study on Li/SOCl_2 cell

用交流阻抗方法研究了Li/SOCl2电池贮存过程中和放电前后锂电极、碳电极和电池的阻抗变化。结果表明,在开路电位下,随贮存时间的增加,锂电极阻抗逐渐增大,约9 d后达到基本稳定,碳电极阻抗大致不变;放电前,锂电极的阻抗约为碳电极的5倍,直接影响着放电性能;贮存12 d的电池以3 mA放电后,锂电极的膜电阻由放电前的413.8Ω减小到5.2Ω,而碳电极的阻抗增大了约1个数量级;放电过程中碳电极阻抗逐渐增大,最终阻止了电池的放电输出。

The variation of resistance for Li electrode, carbon electrode and cell in the process of storage, before and after discharge of Li/SOCl2 cell had been studied by AC impedance method. The results showed that in the open circuit condition, with the increase of storage time, the resistance for Li electrode gradually rose and nearly became stable in about 9 d, that for carbon electrode was almost no change. The resistance of Li electrode was 5 times than that of carbon electrode before discharge, directly influenced on the discharge behavior. The film resistance of Li electrode was reduced from 413.8 Ω （before discharge） to 5.2 Ω after the cell （stored 12 d） discharged with 3 mA, but that of carbon electrode increased for about one order of magnitute. During discharge, the resistance of carbon electrode gradually increased and finally prevented the discharge of the cell.