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LiMn2O4(LMO) is the substance of choice for small and medium-sized energy storage materials in daily life. In this work, Li3InCl6(LIC) is prepared on the surface of LiMn2O4by hydrothermal method using InCl3and LiCl as raw materials. This method stabilizes the LMO crystal structure by uniformly coating the LIC on the LMO surface and effectively maintains the morphology of LMO crystals during the cycling process. SEM and EDS analysis confirm the morphology and homogeneity of the synthesized material LIC on the LMO surface. The prepared material is put into a battery, and the charge-discharge test is carried out at 0.5 C and 1 C. The results show that the LIC surface-modified samples exhibit more than 6% higher cycling performance than the unmodified samples after long cycling.