The application of Li-rich manganese-based cathode materials in all-solid-state batteries: Opportunities and challenges coexist

Li-rich manganese-based layered oxides (LRMO) are considered ideal cathode materials for high-energy-density all-solid-state lithium batteries (ASSBs) due to their high theoretical capacity, wide voltage window, and anion/cation co-oxidation mechanism. Compared to traditional liquid batteries, ASSBs offer higher safety and electrochemical stability, and they are better suited for integration with LRMO materials. However, the application of LRMO in ASSBs still faces challenges such as poor solid-solid interface contact, low ionic conductivity, oxygen loss-induced structural degradation, and volume changes. To overcome these issues, this paper proposes several strategies, including bulk phase modification, microstructural optimization, and interface engineering. Future research should focus on a deeper understanding of LRMO's anion redox mechanisms, improving solid-state electrolyte performance, optimizing interface stability, and advancing the engineering application of LRMO-based ASSBs to facilitate their commercialization.