Research Progress of Sodium Chloride Solid Electrolytes

doi:10.15541/jim20250307

Abstract

Abstract: Sodium-ion batteries are widely considered a promising alternative to lithium-ion batteries owing to their low cost and the abundance of sodium resources. Advancing the development and application of all-solid-state sodium-ion batteries (ASSBs) critically depends on the availability of solid electrolytes that combine high ionic conductivity with a wide electrochemical stability window. Among various solid electrolytes, chloride solid electrolytes have attracted considerable attention in recent years due to their high ionic conductivity, high oxidation potential, and favorable deformability. This review provides a comprehensive overview of the development of sodium chloride solid electrolytes, emphasizing the interplay between chemical composition, crystal structure, and ionic conductivity, and further examining how modification approaches—including cation/anion doping, amorphization, and heterostructure engineering—govern their ionic transport behavior. In addition, this review also examines the electrochemical stability of sodium chloride solid electrolytes and their chemical and electrochemical compatibility with common cathode materials, which are crucial for enabling practical cell configurations. The interfacial degradation mechanisms that arise at the interface with sodium metal anode are also discussed, and recent advances in chloride-based ASSBs are concisely reviewed. Finally, the key challenges that hinder the practical deployment of chloride-based ASSBs are highlighted, and prospective research directions are proposed, which are expected to provide valuable insights to guide the future application of chloride solid electrolytes in energy conversion and storage technologies.

Key words: solid electrolyte, ionic conductivity, chloride, ion transport, solid-state battery, review

CLC Number:

TM911

PENG Dezhao, LI Rui, WANG Wenhong, WANG Zirui, ZHANG Zhizhen. Research Progress of Sodium Chloride Solid Electrolytes[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250307.

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