Carbonized‐MOF as a Sulfur Host for Aluminum–Sulfur Batteries with Enhanced Capacity and Cycling Life,Advanced Functional Materials

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Carbonized‐MOF as a Sulfur Host for Aluminum–Sulfur Batteries with Enhanced Capacity and Cycling Life
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-01-02 , DOI: 10.1002/adfm.201807676
Yue Guo ₁ , Hongchang Jin ₁ , Zhikai Qi ₁ , Zhiqiu Hu ₁ , Hengxing Ji ₁ , Li-Jun Wan _{1,

2}

Affiliation

The rechargeable aluminum–sulfur (Al–S) battery is a promising next generation electrochemical energy storage system owing to its high theoretical capacity of 1672 mAh g⁻¹ and in combining low‐cost and naturally abundant elements, Al and S. However, to date, its poor reversibility and low lifespan have limited its practical application. In this paper, a composite cathode is reported for Al–S batteries based on S anchored on a carbonized HKUST‐1 matrix (S@HKUST‐1‐C). The S@HKUST‐1‐C composite maintains a reversible capacity of 600 mAh g⁻¹ at the 75th cycle and a reversible capacity of 460 mAh g⁻¹ at the 500th cycle under a current density of 1 A g⁻¹, with a Coulombic efficiency of around 95%. X‐ray diffraction and Auger spectrum results reveal that the Cu in HKUST‐1 forms S–Cu ionic clusters. This serves to facilitate the electrochemical reaction and improve the reversibility of S during charge/discharge. Additionally, Cu increases the electron conductivity at the carbon matrix/S interface to significantly decrease the kinetic barrier for the conversion of sulfur species during battery operation.

中文翻译：

碳化MOF作为铝硫电池的硫主体，具有增强的容量和循环寿命

可充电铝硫（Al–S）电池由于其理论容量高达1672 mAh g ^-1，并且结合了低成本和自然丰富的元素Al和S，是一种有前途的下一代电化学储能系统。迄今为止，其可逆性差和使用寿命低限制了其实际应用。在本文中，报道了基于S的Al-S电池复合阴极，该S锚定在碳化的HKUST-1基质（S @ HKUST-1-C）上。在S @ HKUST-1-C复合维持的600毫安g的可逆容量^-1在第75循环和460毫安g的可逆容量^-1 1的g的电流密度下，在第500次循环^-1，库仑效率约为95％。X射线衍射和俄歇光谱结果表明，HKUST-1中的Cu形成S–Cu离子簇。这有助于促进电化学反应并改善充/放电过程中S的可逆性。另外，Cu增加了碳基质/ S界面的电子传导率，从而大大降低了电池运行过程中硫物质转化的动力学势垒。

更新日期：2019-01-02

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