To understand the relationships among first life use case, battery state of health, and end-of-life condition, the materials in commercial 18650 Li-ion cells were aged using prolonged cycling under different conditions and subsequently harvested and analyzed. In particular, different charge termination protocols and temperatures were applied to potential-limited galvanostatic cycling over 1000 cycles. Relationships between observed aging phenomenon and cycling conditions were explored at the cell and cathode materials level. We noted area-specific inhomogeneities in cathode cycled under constant current charge protocol at 25 °C while such inhomogeneity was not observed in three other conditions. The mechanism behind the cathode inhomogeneity was discussed in the context of uneven growth of a secondary solid electrolyte interphase (SEI) on the anode surface occuring during constant-current charge protocol at 25 °C.

为了了解首次使用情况，电池健康状况和报废条件之间的关系，在不同条件下长时间循环使用，对商用18650锂离子电池中的材料进行了时效处理，然后对其进行了收集和分析。特别是，将不同的电荷终止方案和温度应用于1000次循环内受电势限制的恒电流循环。在电池和阴极材料层面探索了观察到的老化现象与循环条件之间的关系。我们注意到在25°C的恒定电流充电协议下循环的阴极中特定于区域的不均匀性，而在其他三个条件下未观察到这种不均匀性。