Current Trends in Nanoscale Interfacial Electrode Engineering for Sulfide-Based All-Solid-State Li-Ion Batteries

All-solid-state Li-ion batteries (ASSLBs) have been a topic of interest in the recent two decades for use in energy storage technologies. Among various types of solid electrolytes, sulfide-based solid electrolytes (SSEs) have been regarded as the most promising electrolytes for practical ASSLBs due to their high ionic conductivity (>1 mS cm(-1)) and the possibility of high energy density cells (>500 Wh kg(-1)) using a currently available high capacity oxide cathode and a Li-metal anode, as well as their nonflammable nature. However, SSEs are known to suffer from: 1) low electrochemical stability window; 2) parasitic interfacial reactions at oxide cathodes; 3) electrochemomechanical degradation at the interface; and 4) dendritic growth at bare Li-metal anodes. Herein, a comprehensive review of specific strategies for high energy density ASSLBs is provided, focusing on the nanoscale interfacial engineering on oxide-based cathode materials and Li-metal anodes. Recent progresses in in situ-based complex interfacial coatings, deposition techniques for synthesizing complex core-shell structures at oxide-based cathode active materials, and lithiophilic seeding followed by dendrite protective coatings at anodes are mainly summarized. Finally, the perspectives for the development of high energy density sulfide-based ASSLBs are highlighted.