Dear Colleagues,

The energy density of lithium-ion batteries has been improved quite a lot in recent decades; however, the safety issue needs to be considered seriously with the increasing energy density. Current lithium-ion batteries using liquid electrolytes suffer from serious safety concerns and limited intrinsic energy density. Replacing the liquid electrolyte in the conventional lithium-ion battery with solid electrolytes can not only address the problem of leakage and flammability, but also guarantee a long cycle life because of the stable structure of the all-solid-state components. Moreover, lithium-ion batteries built with solid electrolytes may achieve a higher energy density using a Li metal anode and a commercial cathode (e.g., high-voltage spinel LiMn_1.5Ni_0.5O₄). Solid electrolytes are the most important component in all-solid-state batteries, but there are no perfect solid electrolytes so far that can meet all the requirements of solid-state batteries.

This Special Issue, “Advanced Solid Electrolytes for Solid-State Batteries”, is to focus on the research and development of advanced solid electrolytes for solid-state batteries. The design of advanced solid electrolytes through creating a new solid electrolyte, compositing different electrolytes, and modifying an electrolyte are all effective strategies to achieve an optimal performance for solid electrolytes for their practical application. Original articles and reviews regarding advanced solid electrolytes in materials science, new synthetic methods, novel designed structures, and system development are solicited. As the interface of engineering and characterization of solid electrolytes plays an important role in determining the electrochemical performances of solid-state batteries, related papers on interface engineering of solid electrolytes between electrodes and solid electrolytes are also very welcome in this issue.

Prof. Dr. Henghui Xu
Guest Editor

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• solid electrolyte 
• Li-metal anode 
• solid-state batteries 
• interfacial engineering 
• multi-function 
• advanced structure
• characterization