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High performance room temperature all-solid-state Na-SexS battery with Na3SbS4–coated cathode via aqueous solution
Journal of Energy Chemistry ( IF 14.0 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.jechem.2020.01.014
Ziqi Zhang , Haonan Cao , Meng Yang , Xinlin Yan , Chuang Yu , Di Liu , Long Zhang

All-solid-state (ASS) Na–S batteries are promising for large-scale energy storage because of the incombustible solid electrolyte and avoiding the dissolution of intermediates. However, the poor contact between the active material and the solid electrolyte in the positive electrode leads to poor electrochemical performance. Here, we report an aqueous solution approach to fabricate Na3SbS4-coated SexS-based active materials for a Na–S battery working at room temperature. Compared with the Na3SbS4 and SexS mixed cathode, the coated cathode achieves significantly improved Na-ion diffusion kinetics and reduced impedance resistance. Additionally, the nanoparticle coating sustains the volume expansion of the cathode during cycling. The resulting batteries deliver an intensively enhanced specific capacity at various rates. Regardless of the mass loading, the Na3SbS4-coated cathode maintains a decent reversible capacity for the long-term discharge/charge cycling. The best battery achieves an initial discharge capacity of 509 mAh g−1 at a current density of 437.4 mA g−1 and capacity retention of 98.9% for 100 cycles. To the best of our knowledge, this is one of the best room temperature ASS Na–S battery so far. This work demonstrates that Na3SbS4 is very promising for the cathode coating purpose for ASS Na–S batteries.



中文翻译:

高性能室温全固态Na-Se x S电池,带Na 3 SbS 4涂层的正极通过水溶液

全固态(ASS)Na–S电池因其不可燃的固体电解质和避免了中间体的溶解而有望用于大规模储能。然而,正极中的活性物质与固体电解质之间的不良接触导致不良的电化学性能。在这里,我们报告了一种水溶液方法,用于制造在室温下工作的Na–S电池的Na 3 SbS 4涂层的Se x S基活性材料。与Na 3 SbS 4和Se x的比较在混合阴极的情况下,涂覆的阴极可显着改善Na离子扩散动力学并降低阻抗阻抗。另外,纳米颗粒涂层在循环期间维持阴极的体积膨胀。所得电池以各种速率提供了增强的比容量。不管质量负荷如何,涂覆有Na 3 SbS 4的阴极在长期的放电/充电循环中都保持着可逆的可充电容量。最好的电池在437.4 mA g -1的电流密度下可达到509 mAh g -1的初始放电容量100次循环的容量保持率为98.9%。据我们所知,这是迄今为止最好的室温ASS Na–S电池之一。这项工作表明,Na 3 SbS 4对于ASS Na–S电池的阴极涂层用途非常有前途。

更新日期:2020-01-23
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