Key issues and emerging trends in sulfide all solid state lithium battery

Lithium battery is considered as one of the most efficient energy storage devices so far, and has promoted the extensive development of various electronic products particularly electric vehicles. Limited by energy density bottlenecks and safety hazards, traditional liquid lithium batteries will inevitably be replaced with a new generation of energy storage devices in the future. All−solid−state lithium battery is considered to be one of the next−generation lithium battery technologies. Sulfide all−solid−state lithium battery have become the most potential technical direction and have achieved unprecedented development in recent years, due to the advantages of sulfide solid state electrolytes such as the highest ionic conductivity, better mechanical ductility, and good interface contact with the electrode. In this review, we discussed the outstanding advantages of sulfide all−solid−state lithium batteries and key issues that need to be resolved. Finally, we also proposed the directions that must be taken for commercially viable sulfide all−solid−state lithium batteries in the future.