Superior performance high-entropy perovskite metal fluoride electrodes derived from spent LiNi1/3Co1/3Mn1/3O2/graphite lithium-ion batteries

Inspired by high-entropy materials with near-equal molar ratios, we have developed a streamlined and scalable method to synthesize a high-entropy perovskite fluoride electrode material, K0.65Li0.07Mg0.19Mn0.17Co0.16Ni0.17Cu0.24F2.70 (KLMF). KLMF is synthesized via a direct liquid-phase method, which employs spent LiNi1/3 Co1/3Mn1/3O2/graphite (NCM111/G) lithium-ion batteries (LIBs) as the fundamental reactants. After 500 cycles at a current density of 2 A/g, KLMF demonstrates a specific capacity that ranges from 1043.1 − 477.95 mAh/g when tested at current densities from 0.1 − 6.4 A/g. Moreover, KLMF maintains robust performance in a full-cell configuration, underscoring its significant potential for practical applications.