A High‐Kinetics Sulfur Cathode with a Highly Efficient Mechanism for Superior Room‐Temperature Na–S Batteries,Advanced Materials

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A High‐Kinetics Sulfur Cathode with a Highly Efficient Mechanism for Superior Room‐Temperature Na–S Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2020-01-15 , DOI: 10.1002/adma.201906700
Zichao Yan ₁ , Yaru Liang _{2,

3} , Jin Xiao ₄ , Weihong Lai ₁ , Wanlin Wang ₁ , Qingbing Xia ₁ , Yunxiao Wang ₁ , Qinfen Gu ₅ , Huanming Lu ₃ , Shu‐Lei Chou ₁ , Yong Liu ₆ , Huakun Liu ₁ , Shi‐Xue Dou ₁

Affiliation

Applications of room‐temperature–sodium sulfur (RT‐Na/S) batteries are currently impeded by the insulating nature of sulfur, the slow redox kinetics of sulfur with sodium, and the dissolution and migration of sodium polysulfides. Herein, a novel micrometer‐sized hierarchical S cathode supported by FeS₂ electrocatalyst, which is grown in situ in well‐confined carbon nanocage assemblies, is presented. The hierarchical carbon matrix can provide multiple physical entrapment to polysulfides, and the FeS₂ nanograins exhibit a low Na‐ion diffusion barrier, strong binding energy, and high affinity for sodium polysulfides. Their combination makes it an ideal sulfur host to immobilize the polysulfides and achieve reversible conversion of polysulfides toward Na₂S. Importantly, the hierarchical S cathode is suitable for large‐scale production via the inexpensive and green spray‐drying method. The porous hierarchical S cathode offers a high sulfur content of 65.5 wt%, and can deliver high reversible capacity (524 mAh g⁻¹ over 300 cycles at 0.1 A g⁻¹) and outstanding rate capability (395 mAh g⁻¹ at 1 A g⁻¹ for 850 cycles), holding great promise for both scientific research and real application.

中文翻译：

具有高性能机制的高性能运动型硫阴极，可提供出色的室温Na-S电池

目前，由于硫的绝缘性，硫与钠的缓慢氧化还原动力学以及多硫化钠的溶解和迁移，阻碍了室温钠硫（RT-Na / S）电池的应用。本文介绍了一种新型的，由FeS ₂电催化剂支撑的微米级分级S阴极，该阴极在密闭的碳纳米笼组件中原位生长。分层的碳基质可以为多硫化物提供多种物理包裹，而FeS ₂纳米颗粒表现出低的Na-离子扩散势垒，强大的结合能以及对多硫化钠的高亲和力。它们的组合使其成为固定多硫化物并实现多硫化物向Na ₂可逆转化的理想硫磺主体。S。重要的是，分级S阴极适合通过廉价且绿色的喷雾干燥方法进行大规模生产。多孔分层小号阴极提供的65.5重量％的高的硫含量，并能提供高的可逆容量（524毫安克^-1超过300个循环的0.1 A克^-1）和出色的速率能力（395毫安克^-1在1A g ^-1（850个循环），对科学研究和实际应用都具有广阔的前景。

更新日期：2020-02-24

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