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Capacity Retention Analysis in Aluminum-Sulfur Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-15 00:00:00 , DOI: 10.1021/acsaem.0c00921 Jasmin Smajic 1 , Shianlin Wee 1 , Filipa R. Fernandes Simoes 1 , Mohamed N. Hedhili 2 , Nimer Wehbe 2 , Edy Abou-Hamad 2 , Pedro M. F. J. Costa 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-15 00:00:00 , DOI: 10.1021/acsaem.0c00921 Jasmin Smajic 1 , Shianlin Wee 1 , Filipa R. Fernandes Simoes 1 , Mohamed N. Hedhili 2 , Nimer Wehbe 2 , Edy Abou-Hamad 2 , Pedro M. F. J. Costa 1
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The electrochemical performance of aluminum-sulfur batteries is beset by poor stability and sluggish charge-storage properties. To address these issues, carbon allotropes have been used as electrode fillers, but successful outcomes remain inexplicably elusive. Here, a composite of sulfur and small-diameter single-walled carbon nanotubes was studied as a cathode for AlCl3:[EMIM]-based aluminum batteries. The presence of carbon nanotubes, while enabling a high capacity (1024 mAh g–1) with slower decay and reducing the electrolyte-to-sulfur ratio, is insufficient to fully stabilize the cell’s performance. In fact, the main obstacle is in the interaction between sulfur and chloroaluminate ions. As we show, there is a gradual buildup of insoluble and poorly conductive discharge products that inhibit the diffusion of electroactive ions and, ultimately, cause capacity decay. Overall, this work sheds light on the carbon–sulfur–electrolyte interactions and their role on the underlying charge-storage mechanism of aluminum-sulfur batteries.
中文翻译：
铝硫电池容量保持率分析
铝硫电池的电化学性能受到稳定性差和电荷存储性能低下的困扰。为了解决这些问题，碳同素异形体已被用作电极填料，但成功的结果仍然难以解释。在这里，研究了硫和小直径单壁碳纳米管的复合材料作为AlCl 3：[EMIM]基铝电池的阴极。碳纳米管的存在，同时可实现高容量（1024 mAh g –1）具有较慢的衰减并降低了电解质与硫的比率，不足以完全稳定电池的性能。实际上，主要障碍在于硫和氯铝酸根离子之间的相互作用。正如我们所显示的，不溶性和导电性差的放电产物会逐渐堆积，从而抑制电活性离子的扩散，最终导致容量衰减。总体而言，这项工作揭示了碳-硫-电解质的相互作用及其在铝硫电池潜在的电荷存储机理中的作用。
更新日期：2020-06-15
中文翻译：
铝硫电池容量保持率分析
铝硫电池的电化学性能受到稳定性差和电荷存储性能低下的困扰。为了解决这些问题，碳同素异形体已被用作电极填料，但成功的结果仍然难以解释。在这里，研究了硫和小直径单壁碳纳米管的复合材料作为AlCl 3：[EMIM]基铝电池的阴极。碳纳米管的存在，同时可实现高容量（1024 mAh g –1）具有较慢的衰减并降低了电解质与硫的比率，不足以完全稳定电池的性能。实际上，主要障碍在于硫和氯铝酸根离子之间的相互作用。正如我们所显示的，不溶性和导电性差的放电产物会逐渐堆积，从而抑制电活性离子的扩散，最终导致容量衰减。总体而言，这项工作揭示了碳-硫-电解质的相互作用及其在铝硫电池潜在的电荷存储机理中的作用。
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