As the battery continues working to generate heat, the temperature of the electrode rises, which will accelerate the failure of the battery by amplifying the phase transition and the side reactions. Therefore, improving the cycle stability of nickel-rich cathode materials at elevated temperature is a problem that needs to be solved urgently. For this reason, we successfully modified LiAlO₂@Al₂O₃ on LiNi_0.88Co_0.09Al_0.03O₂(NCA). With the synergetic effect of LiAlO₂ and Al₂O₃, the modified NCA material has significantly improved cycle stability at 45°C. Its capacity retention exceeds 88.4% after 100 cycles at 1.0 C, While the bare cathode can only retain 73.7% capacity. The full cell assembled from modified NCA and graphite has an excellent capacity retention (94.9%) after being charged and discharged for 700 cycles at a current density of 1.0 C. All these indicates that the LiAlO₂@Al₂O₃ coating significantly improves the capacity retention and cycle life of NCA for lithium-ion batteries at elevated temperatures.

随着电池继续工作以产生热量，电极的温度升高，这将通过放大相变和副反应来加速电池的故障。因此，提高富镍正极材料在高温下的循环稳定性是一个亟待解决的问题。因此，我们在LiNi _0.88 Co _0.09 Al _0.03 O ₂（NCA）上成功地改性了LiAlO ₂ @Al ₂ O ₃。具有LiAlO ₂和Al ₂ O ₃的协同作用，改性的NCA材料在45°C时具有显着改善的循环稳定性。在1.0 C下进行100次循环后，其容量保持率超过88.4％，而裸阴极只能保持73.7％的容量。由改性NCA和石墨组装而成的全电池在1.0 C的电流密度下充电和放电700次循环后具有出色的容量保持率（94.9％）。所有这些表明，LiAlO ₂ @Al ₂ O ₃涂层显着改善了电池的使用寿命。高温下锂离子电池NCA的容量保持率和循环寿命。