管式ZEBRA电池的长循环性能与电压弛豫曲线分析

Analysis of long cycle performance and voltage relaxation curves of tubular ZEBRA batteries

管式ZEBRA电池(也称钠-金属氯化物电池)在电网储能、备用电源和极端环境等领域具有广阔的应用前景,已处于商业化示范应用发展阶段。然而,进一步提高其长循环性能仍是下一代ZEBRA电池的研发重点。判断ZEBRA电池的健康状态对于预测其循环稳定性至关重要。我们结合管式电芯的阴极颗粒特征、长循环性能曲线与放电电压弛豫曲线进行了分析,得到ZEBRA电池将经历前期活化、中期性能稳定和后期性能老化等三个不同的性能阶段。通过观察ZEBRA电池的电压弛豫曲线的变化,可以较好地判断电池性能所处的阶段,从而获取电池的健康状态。并以此判断为基础,通过改变阴极的组成可达到减少电池活化时间,保持电池长循环稳定性的目的。

The tubular ZEBRA battery(also called sodium-metal chloride battery)has extensive prospects in grid energy storage,backup power supply,and extreme environment applications,and has been commercially exhibited.However,enhancing its cycle stability performance is still the focus of the next-generation ZEBRA battery.Determining the state of health(SOH)is crucial to forecasting the cycle stability of the ZEBRA battery.Based on the analysis of the cathode particle characteristics,long cycle performance curves,and voltage relaxation curves of the tubular cell,we discovered that the ZEBRA battery would go through three distinct performance stages,namely,early activation,performance stabilization,and later performance aging stage.By observing the modifications in the voltage relaxation curves,we could judge the performance stage and obtain the ZEBRA battery’s SOH.Based on the judgment,changing the composition of the cathode could reduce the activation time,and improve the long cycle stability of the battery.