Oxide-Based Solid-State Batteries: A Perspective on Composite Cathode Architecture

摘要

The garnet-type phase Li7La_3Zr_2O_(12) (LLZO) attracts significant attention as anoxide solid electrolyte to enable safe and robust solid-state batteries (SSBs)with potentially high energy density. However, while significant progresshas been made in demonstrating compatibility with Li metal, integratingLLZO into composite cathodes remains a challenge. The current perspectivefocuses on the critical issues that need to be addressed to achieve theultimate goal of an all-solid-state LLZO-based battery that delivers safety,durability, and pack-level performance characteristics that are unobtainablewith state-of-the-art Li-ion batteries. This perspective complements existingreviews of solid/solid interfaces with more emphasis on understandingnumerous homo- and heteroionic interfaces in a pure oxide-based SSBand the various phenomena that accompany the evolution of the chemical,electrochemical, structural, morphological, and mechanical properties ofthose interfaces during processing and operation. Finally, the insights gainedfrom a comprehensive literature survey of LLZO–cathode interfaces are usedto guide efforts for the development of LLZO-based SSBs.