New Na‐Ion Solid Electrolytes Na4−xSn1−xSbxS4 (0.02 ≤ x ≤ 0.33) for All‐Solid‐State Na‐Ion Batteries |
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| Authors: | Jongwook W. Heo Abhik Banerjee Kern Ho Park Yoon Seok Jung Seung‐Tae Hong |
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| Affiliation: | 1. Department of Energy Science and Engineering, DGIST (Daegu Gyeongbuk Institute of Science and Technology), Daegu, South Korea;2. School of Energy and Chemical Engineering, Department of Energy Engineering, UNIST (Ulsan National Institute of Science and Technology), Ulsan, South Korea |
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| Abstract: | 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 Na4?xSn1?xSbxS4 (0.02 ≤ x ≤ 0.33) with space group I41/acd is described. The evolution of a new phase, distinctly different from Na4SnS4 or Na3SbS4, 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, TiS2/Na–Sn all‐solid‐state Na‐ion batteries using Na3.75Sn0.75Sb0.25S4 demonstrates high capacity (201 mA h (g of TiS2)?1) with excellent reversibility. |
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| Keywords: | crystal structures ionic conductivities solid electrolytes solid‐state batteries sulfides |
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