Herein, it is aimed to synthesize a LiNi_0.5Mn_1.5O₄ material with good cycle performance, high specific capacity, and excellent electrochemical performance by a high-temperature solid-state method and surface coating modification processes. To improve the cyclic performance of LiNi_0.5Mn_1.5O₄ at elevated temperature (55 °C), the AlPO₄ coating process conditions are studied. The effect of the calcination temperature on the performance of the AlPO₄ coating is focused on. In the range of 3.5–5.1 V, the sample of LiNi_0.5Mn_1.5O₄ coated with AlPO₄ is calcined at 600 °C and capacity retention is 97.5% after 100 cycles at high temperature (55 °C). The results show that the preparation of AlPO₄ coating under appropriate process conditions effectively prevents the corrosion of hydrogen fluoride (HF) on the electrode material in the electrolyte and improves the high-temperature cycling performance of the material.

中文翻译：

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不同煅烧温度对AlPO4包覆改性尖晶石LiNi0.5Mn1.5O4材料高温性能的影响

在此，旨在通过高温固相法和表面涂层改性工艺合成具有良好循环性能、高比容量和优异电化学性能的LiNi _0.5 Mn _1.5 O ₄材料。为了提高LiNi _0.5 Mn _1.5 O ₄在高温（55°C）下的循环性能，研究了AlPO ₄涂层工艺条件。关注煅烧温度对AlPO ₄涂层性能的影响。在 3.5-5.1 V 范围内，AlPO ₄包覆的 LiNi _0.5 Mn _1.5 O ₄样品在 600°C 下煅烧，在高温 (55°C) 下循环 100 次后容量保持率为 97.5%。结果表明，在适当的工艺条件下制备AlPO ₄涂层有效地防止了电解液中氟化氢(HF)对电极材料的腐蚀，提高了材料的高温循环性能。