Beyond Conventional Coatings: Melt‐Infiltration of Antiperovskites for High‐Voltage All‐Solid‐State Batteries

Protective antiperovskite coatings are successfully applied to a layered Ni-rich cathode material using a solvent-free approach, leading to notable enhancements in cycling performance and stability of thiophosphate-based all-solid-state battery cells.

Solid-state batteries (SSBs) have emerged as promising candidates for next-generation energy-storage solutions, particularly for electric vehicle applications. To overcome challenges related to interfacial stability and electro-chemo-mechanical degradation during operation, the development of protective surface coatings for cathode active materials (CAMs) is essential. Lithium-rich antiperovskites (LiRAPs) exhibit a unique set of beneficial properties, notably a high ionic partial conductivity at room temperature, enabling the deployment of advanced coating techniques via cost-effective and environmentally benign methods. In the present work, the application of LiRAP coatings to a layered Ni-rich CAM, namely LiNi_0.85Co_{0. 1}Mn_0.05O₂ (NCM85), is examined, utilizing a low-temperature and solvent-free approach. The effectiveness of the procedure is evaluated through microscopy analyses and electrochemical performance assessments. The results demonstrate a significant improvement in cyclability, highlighting the potential of LiRAP-based surface coatings for enhancing the performance and longevity of high-capacity cathodes in SSB systems.

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