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New Na‐Ion Solid Electrolytes Na 4− x Sn 1− x Sb x S 4 (0.02 ≤ x ≤ 0.33) for All‐Solid‐State Na‐Ion Batteries
Author(s) -
Heo Jongwook W.,
Banerjee Abhik,
Park Kern Ho,
Jung Yoon Seok,
Hong SeungTae
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702716
Subject(s) - materials science , ion , tetragonal crystal system , fast ion conductor , sulfide , solid solution , dissolution , electrolyte , precipitation , ionic bonding , phase (matter) , crystallography , chemical stability , analytical chemistry (journal) , crystal structure , chemistry , chemical engineering , metallurgy , physics , electrode , organic chemistry , chromatography , meteorology , engineering
Sulfide Na‐ion solid electrolytes (SEs) are key to enable room‐temperature operable all‐solid‐state Na‐ion batteries that are attractive for large‐scale energy storage applications. To date, few sulfide Na‐ion SEs have been developed and most of the SEs developed contain P and suffer from poor chemical stability. Herein, discovery of a new structural class of tetragonal Na 4− x Sn 1− x Sb x S 4 (0.02 ≤ x ≤ 0.33) with space group I4 1 /acd is described. The evolution of a new phase, distinctly different from Na 4 SnS 4 or Na 3 SbS 4 , allows fast ionic conduction in 3D pathways (0.2–0.5 mS cm −1 at 30 °C). Moreover, their excellent air stability and reversible dissolution in water and precipitation are highlighted. Specifically, TiS 2 /Na–Sn all‐solid‐state Na‐ion batteries using Na 3.75 Sn 0.75 Sb 0.25 S 4 demonstrates high capacity (201 mA h (g of TiS 2 ) −1 ) with excellent reversibility.