Na3SbS4: A Solution Processable Sodium Superionic Conductor for All‐Solid‐State Sodium‐Ion Batteries |
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| Authors: | Dr Abhik Banerjee Kern Ho Park Jongwook W Heo Young Jin Nam Chang Ki Moon Prof Seung M Oh Prof Seung‐Tae Hong Prof Yoon Seok Jung |
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| Institution: | 1. School of Energy and Chemical Engineering, Department of Energy Engineering, UNIST, Ulsan, South Korea;2. School of Chemical and Biological Engineering, Seoul National University, Seoul, South Korea;3. Department of Energy Systems Engineering, DGIST, Daegu, South Korea |
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| Abstract: | All‐solid‐state sodium‐ion batteries that operate at room temperature are attractive candidates for use in large‐scale energy storage systems. However, materials innovation in solid electrolytes is imperative to fulfill multiple requirements, including high conductivity, functional synthesis protocols for achieving intimate ionic contact with active materials, and air stability. A new, highly conductive (1.1 mS cm?1 at 25 °C, Ea=0.20 eV) and dry air stable sodium superionic conductor, tetragonal Na3SbS4, is described. Importantly, Na3SbS4 can be prepared by scalable solution processes using methanol or water, and it exhibits high conductivities of 0.1–0.3 mS cm?1. The solution‐processed, highly conductive solidified Na3SbS4 electrolyte coated on an active material (NaCrO2) demonstrates dramatically improved electrochemical performance in all‐solid‐state batteries. |
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| Keywords: | batteries chalcogens sodium solid electrolytes solution process |
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