High-Entropy Perovskite Metal Fluoride Electrodes: Effortless Synthesis Meets a High Specific Capacity

High-entropy perovskite fluorides demonstrate promising potential owing to their robust skeletal structures and the synergistic effects of their high entropies. However, their mass production is hindered by limitations associated with the hydrothermal preparation route, and there is still scope for enhancing the performances of such materials. In this study, the feasibility of synthesizing K(Mg0.2Mn0.2Co0.2Ni0.2Cu0.2)F3 (KMF3) was confirmed using first-principles calculations and thermodynamic analyses. Based on these theoretical foundations, a simple liquid-phase synthesis process was developed. This process successfully generated the desired product, whose electrochemical performance could be enhanced by adjusting the water/alcohol ratio. After 280 cycles at a current density of 100 mA g−1, the material retained a specific capacity of 685 mAh g−1. Furthermore, customized lithium-ion batteries (LIBs) were developed using KMF3 as the anode and LiFePO4 (LFP) as the cathode. These LIBs exhibited impressive performances at various charge/discharge rates. Overall, this work provides a novel method for the straightforward synthesis of high-performance high-entropy perovskite fluoride electrode materials.