O‐Tailored Microstructure‐Engineered Interface toward Advanced Room Temperature All‐Solid‐State Na Batteries. (12th May 2022)

• Record Type: Journal Article
• Authors: Li, Lin; Xu, Ruonan; Zhang, Long; Zhang, Ziqi; Yang, Meng; Liu, Di; Yan, Xinlin; Zhou, Aijun
• Is Part Of: Advanced functional materials. Volume 32:Number 31(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-12
• Subjects: anion migration -- composites -- interphases and interfaces -- solid‐state batteries -- sulfide solid electrolytes; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202203095
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: The severe parasitic interface reaction and dendrite growth retard the practical applications of all‐solid‐state (ASS) Na batteries with sulfide solid electrolytes (SEs). Here, a novel composite SE is proposed, with a high ionic conductivity, composed of Na3 SbS4 (NSS) and oxysulfide glass. The study reveals that the P2 S7‐ a O a and PS4‐ a O a units in oxysulfide play various roles: The former is deoxidized to release free O ions, which reacts with the anode via migrating to form oxides, favoring an improved interface stability. The latter is highly stable upon cycling, thereby maintaining an ion transport network. Meanwhile, NSS acts as a dendrite predator via reacting with penetrated Na. These advantages enable the resulting ASS Na battery with superior long‐term cycling performance at a high current density at room temperature, one of the best results so far. This discovery sheds light on innovative advanced SE materials through an oxysulfide‐based composite design. Abstract : The anion units of the oxysulfide along with Na3 SbS4 in the developed composite solid electrolyte are found to play synergistic functions on improving Na battery performances at room temperature. The deoxidization of the dimeric unit liberates free O ions, migrating to the anode to form an oxide‐based self‐limiting interphase and, the (electro)chemically stable monomeric unit maintaining an ion conducting network.