Aged battery is prone to fire accidents. Thermal stability change of battery subjected to inhomogeneous aging is studied in this manuscript by accelerating rate calorimeter. The results indicate that thermal runaway time decreases for aged batteries. Solid electrolyte interphase and lithium plating suppress and accelerate onset exothermic side reactions. Transition metal dissolution accelerates positive electrode decomposition and oxygen release. T_TR of aged batteries decreases compared to fresh battery. Microscopic changes of negative electrodes for batteries cycled at high and low temperature are inhomogeneous. T_onset for batteries cycled at low temperature decreases as lithium plating covers all of the negative electrode surface. T_onset for batteries cycled at high temperature and with 100% state of charge (SOC) increases. This is the same to battery stored at high temperature. Local lithium plating affects thermal stability of battery with 100% SOC less. However, T_onset for batteries with SOC lower than 50% SOC and subjected to local lithium plating decreases compared to fresh battery. Local lithium plating accelerates onset exothermic side reactions for battery with SOC lower than 50% SOC. The results of this manuscript are important to thermal runaway prevention for batteries in their whole operation life.

老化的电池很容易发生火灾事故。本文通过加速量热计研究了电池在不均匀老化过程中的热稳定性变化。结果表明，老化电池的热失控时间会缩短。固体电解质界面和锂电镀抑制并加速放热副反应的发生。过渡金属溶解加速正极分解和氧气释放。与新鲜电池相比，老化电池的T _TR降低。高低温循环的电池负极微观变化不均匀。由于锂镀层覆盖了所有负极表面，因此在低温下循环的电池的起始_{时间降低。}在高温下循环且充电状态 (SOC) 为 100% 的电池的T_{起始时间会增加。}这与高温储存的电池相同。局部镀锂对100%SOC电池的热稳定性影响较小。然而，与新鲜电池相比，SOC 低于 50% SOC 且经过局部锂电镀的电池的T _{onset会降低。}局部镀锂会加速 SOC 低于 50% SOC 的电池的放热副反应的发生。该手稿的结果对于电池在整个使用寿命期间的热失控预防具有重要意义。