Entropy engineering strategies in nickel-based layered cathode materials: Advances in structural stabilization and electrochemical performance

Entropy engineering strategies have emerged as a transformative approach for enhancing the structural stability and electrochemical performance of nickel-based layered cathode materials in lithium-ion batteries. By introducing multiple principal elements, these strategies leverage high configurational entropy to suppress phase separation, mitigate structural degradation, and improve cycling stability. This review systematically explores the principles of entropy engineering, including high-entropy doping, coating, and structural design, highlighting their impact on phase stability, ion transport, and capacity retention. The implementation of high-entropy oxides, core-shell architectures, and advanced surface coatings is discussed, with a focus on recent advancements that have demonstrated superior performance under high-rate and high-voltage cycling conditions. Despite these promising developments, the practical application of entropy engineering strategies faces significant challenges, including complex synthesis processes, scalability limitations, and the lack of a systematic theoretical framework for optimizing multi-element compositions. This review provides a comprehensive analysis of the fundamental mechanisms underlying entropy engineering, critically examines the current state of high-entropy cathode materials, and proposes future research directions for overcoming existing limitations. By offering an in-depth understanding of entropy engineering strategies, this work aims to guide the design and development of next-generation lithium-ion battery cathodes.