Synergistic regulation of entropy effect and interface engineering to boost metal fluoride cathode performance in lithium-ion batteries
Transition metal fluorides (TMFs) are promising cathode materials for lithium-ion batteries (LIBs) due to their high theoretical capacity and energy density, yet their practical application is hindered by low utilization rates stemming from particle sizes exceeding the effective Li+ transport distance (<20 nm). This work introduces a multiphase metal fluoride composite (MMFC) synthesized via a hydrothermal method, leveraging high-entropy concepts and interface engineering to enhance electrochemical performance. The MMFC, after annealing at 400°C (MMFC-400), exhibits high specific capacity, excellent rate capability, and cycling stability. The multiphase interfaces accelerate Li+ migration kinetics and provide additional active sites, addressing the limitations of conventional TMF cathodes. This study proposes a multiphase interfacial energy storage strategy for advanced TMF cathodes, offering a pathway to high-performance LIBs.