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Approach to Increase the Utilization of Active Material in a High Sulfur-Loaded Cathode for High Areal Capacity Room-Temperature Sodium–Sulfur Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-01-12 , DOI: 10.1021/acsaem.0c02294
Ajit Kumar 1, 2, 3 , Arnab Ghosh 1, 2, 3 , Arpita Ghosh 3 , Aakash Ahuja 3 , Maria Forsyth 4, 5 , Douglas R. MacFarlane 2, 5 , Sagar Mitra 3
Affiliation  

Developing room-temperature sodium–sulfur (RT Na–S) batteries with a high-sulfur-containing cathode and a relatively low amount of electrolyte is the prime factor for implementation of these batteries into the energy storage market. However, it is extremely challenging to achieve stable, long-term cyclability while utilizing a high-sulfur-loaded cathode, since strong adhesion of active material with the current collector should be maintained during charge–discharge. Here, we report manganese dioxide nanoarray-decorated carbon cloth conformally wrapped with sodium–alginate nanofibers (abbreviated as CC@MnO2@Na-alg) as a robust cathode current collector, which not only restricts the gradual dissolution of polysulfides but also offers good adhesion to the active material. To facilitate ion-transport kinetics, a liquid-phase Na2S6 catholyte is used as an active material. At 1C (C = 1672 mA g–1), the catholyte-infiltrated CC@MnO2@Na-alg electrode scaffold, with a high sulfur loading of 3.4 mg cm–2, exhibits a remarkable capacity retention of 94.4% after 1000 cycles. Comprehensive theoretical studies reveal the possible anchoring sites in sodium–alginate for the confinement of the polysulfide species.

中文翻译:

在高容量大容量室温钠硫电池中增加高硫负载阴极中活性物质利用率的方法

开发具有高含硫阴极和相对少量电解质的室温钠硫(RT Na–S)电池是将这些电池应用于能量存储市场的主要因素。但是,在使用高硫负载的阴极时要获得稳定,长期的可循环性是极具挑战性的,因为在充放电过程中应保持活性材料与集电器的牢固粘附。在这里,我们报告了用海藻酸钠纳米纤维保形包裹二氧化锰纳米阵列修饰的碳布(缩写为CC @ MnO 2Na-alg)作为坚固的阴极集电器,它不仅限制了多硫化物的逐渐溶解,而且还对活性材料提供了良好的附着力。为了促进离子迁移动力学,将液相Na 2 S 6阴极电解液用作活性材料。在1C(C = 1672 mA g –1)时,阴极渗透的CC @ MnO 2 @ Na-alg电极支架具有3.4 mg cm –2的高硫负荷,在1000次循环后显示出94.4%的显着容量保持率。全面的理论研究表明,在海藻酸钠中可能存在锚固位点,以限制多硫化物的形成。
更新日期:2021-01-25
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