A comprehensive study on high temperature cycling (80 °C) of industrial manufactured Li-ion pouch cells (NMC-111/Graphite) filled with different electrolytes is introduced. Ageing processes such as capacity fade, resistance increase and gas generation are reduced by the choice of appropriate electrolyte formulations. However, even by using additive formulations designed for elevated temperatures a large resistance increase is observed after 200 cycles and more (which does not happen at 55 °C). Symmetrical EIS (Electrochemical Impedance Spectroscopy) shows that the cathodic charge transfer resistance is the main reason for this behaviour. Nonetheless most of the active Li is still available when cycling with suitable additives. No change of the cathode crystalline structure or a growth of the cathodic surface reconstruction layer is observed post cycling at 80 °C. Therefore a disintegration of NMC secondary particles is believed to be the main reason of the cell failure. A separation of single grains is leading to new decomposition and reconstruction layers between primary particles and an increased charge transfer resistance. Further approaches to improve the high temperature cycle stability of NMC based materials should therefore be aimed at the cathode particles morphology in combination with similar electrolyte formulations as used in this study.

介绍了填充不同电解质的工业制造锂离子袋式电池（NMC-111 / Graphite）高温循环（80°C）的综合研究。通过选择合适的电解质配方，可以减少诸如容量衰减，电阻增加和气体产生等老化过程。但是，即使使用专为高温设计的添加剂配方，在200次循环或更长时间后仍观察到较大的电阻增加（在55°C时不会发生）。对称EIS（电化学阻抗谱）表明，阴极电荷转移电阻是此行为的主要原因。但是，当与合适的添加剂循环使用时，大多数活性锂仍然可用。在80°C循环后未观察到阴极晶体结构的变化或阴极表面重建层的生长。因此，NMC次级颗粒的分解被认为是细胞衰竭的主要原因。单个晶粒的分离导致初级粒子之间出现新的分解和重建层，并增加了电荷转移阻力。因此，结合本研究中使用的类似电解质配方，应采取进一步措施来改善基于NMC的材料的高温循环稳定性。单个晶粒的分离导致初级粒子之间出现新的分解和重建层，并增加了电荷转移阻力。因此，结合本研究中使用的类似电解质配方，应采取进一步措施来改善基于NMC的材料的高温循环稳定性。单个晶粒的分离导致初级粒子之间出现新的分解和重建层，并增加了电荷转移阻力。因此，结合本研究中使用的类似电解质配方，应采取进一步措施来改善基于NMC的材料的高温循环稳定性。