Effect of Different Calcination Temperatures on the High‐Temperature Properties of AlPO₄‐Coated Modified Spinel LiNi_0.5Mn_1.5O₄ Material

Abstract

Herein, it is aimed to synthesize a LiNi0.5Mn1.5O4 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 LiNi0.5Mn1.5O4 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 LiNi0.5Mn1.5O4 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.