Fundamentals, Status and Promise of Li‐Rich Layered Oxides for Energy‐Dense Li‐Ion Batteries

Li-ion batteries (LIBs) are the dominant electrochemical energy storage devices in the global society, in which cathode materials are the key components. As a requirement for higher energy-dense LIBs, Li-rich layered oxides (LLO) cathodes that can provide higher specific capacity are urgently needed. However, LLO still face several significant challenges before bringing these materials to market. In this Review, the fundamental understanding of LLO is described, with a focus on the physical structure-electrochemical property relationships. Specifically, the various strategies toward reversible anionic redox is discussed, highlighting the approaches that take the basic structure of the battery into account. In addition, the application for all-solid-state batteries and consider the prospects for LLO is assessed.