(652b) Interface Engineering for Optimizing Performance of the Ultra-High Nickel Cathode in All-Solid-State Batteries

All-solid-state lithium batteries offer the advantages of high energy density and superior safety, making them an ideal choice for next-generation battery technology. In all-solid-state lithium batteries, ultra-high nickel cathode materials can achieve a remarkable energy density of 500Wh/kg. However, during prolonged charge-discharge cycles, these batteries face challenges such as micro-cracks within particles of ultra-high nickel cathode materials, failure in solid-solid contact at interfaces, and surface chemical side reactions. To address these issues, a surface engineering design strategy has been employed to construct various nano-oxide coatings and oxygen-vacancy-rich lithium oxide coatings on the surface of ultra-high nickel cathode particles. This approach aims to enhance the interface stability of ultra-high nickel cathodes by reducing the internal micro-cracks within cathode particles and minimizing the surface side reactions that occur between cathode and solid electrolyte particles during battery cycling. Finally, both the long cycle life and fast charging performance of all-solid-state batteries are improved.