New Na‐Ion Solid Electrolytes Na4−xSn1−xSbxS4 (0.02 ≤ x ≤ 0.33) for All‐Solid‐State Na‐Ion Batteries,Advanced Energy Materials

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New Na‐Ion Solid Electrolytes Na4−xSn1−xSbxS4 (0.02 ≤ x ≤ 0.33) for All‐Solid‐State Na‐Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-01-15 , DOI: 10.1002/aenm.201702716
Jongwook W. Heo ₁ , Abhik Banerjee ₂ , Kern Ho Park ₂ , Yoon Seok Jung ₂ , Seung-Tae Hong ₁

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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₋_xSb_xS₄ (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 Na_3.75Sn_0.75Sb_0.25S₄ demonstrates high capacity (201 mA h (g of TiS₂)⁻¹) with excellent reversibility.

中文翻译：

适用于全固态钠离子电池的新型钠离子固体电解质Na4-xSn1-xSbxS4（0.02≤x≤0.33）

硫化物钠离子固体电解质（SE）是实现室温可操作的全固态钠离子电池的关键，这对于大规模储能应用具有吸引力。迄今为止，几乎没有开发出硫化物Na-ion SE，并且开发的大多数SE都含有P，并且化学稳定性差。在本文中，新的结构类四角形的Na的发现_4-_X的Sn _1-_X Sb的_X小号₄（0.02≤ X ≤0.33），空间群I4 ₁被描述/ ACD。与Na ₄ SnS ₄或Na ₃ SbS ₄明显不同的新相的演变可以在3D途径中实现快速的离子传导（在30°C时为0.2–0.5 mS cm ^-1）。此外，其出色的空气稳定性以及在水中和沉淀中的可逆溶解性也得到了强调。具体来说，使用Na _3.75 Sn _0.75 Sb _0.25 S _4的TiS ₂ / Na-Sn全固态Na-离子电池显示出高容量（201 mA h（TiS _2的克数）^-1）和极好的可逆性。

更新日期：2018-01-15

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