On September 25th, reports emerged highlighting that in cutting-edge sectors like electric vehicles, electric aircraft, and humanoid robots, there exists a pressing need for power systems that can deliver both high energy and superior safety. Presently, the development of batteries that seamlessly integrate high energy density with exceptional safety features has emerged as a pivotal topic within the energy storage domain. Solid-state batteries, renowned for their high energy density and inherent safety attributes, are widely recognized as a crucial development avenue for the next generation of secondary lithium batteries. Notably, solid-state batteries employing lithium-rich manganese-based layered oxides as cathode materials are anticipated to achieve a remarkable energy density breakthrough, surpassing 600 Wh kg−1.