Synergistic Effect between S and Se Enhancing the Electrochemical Behavior of SexSy in Aqueous Zn Metal Batteries

材料科学 电化学 阴极 水溶液 反应性(心理学) 化学工程 金属 电极 冶金 物理化学 化学 工程类 医学 替代医学 病理
作者
Wei Li,Yongsong Ma,Peng Li,Xiaoyun Jing,Kai Jiang,Dihua Wang
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:31 (20) 被引量:65
标识
DOI:10.1002/adfm.202101237
摘要

Abstract Developing high‐capacity conversional cathode materials for aqueous Zn batteries is promising to improve their energy densities but challenging as well. In this work, three kinds of selenium–sulfur solid solutions and their composites (denoted as SeS 14 @ 3D‐NPCF, SeS 5.76 @ 3D‐NPCF, and SeS 2.46 @ 3D‐NPCF) are proposed and systematically investigated. Due to the introduction of Se and its synergistic effect with S, their physical and electrochemical properties are manipulated; in particular, by optimizing the Se content in these composites, SeS 5.76 @ 3D‐NPCF shows a capacity of 1222 mAh g −1 and flat plateau of 0.71 V at 0.2 A g −1 , reaching an ultrahigh energy density of 867.6 Wh kg −1 (based on SeS 5.76 ), superior rate capacity of 713 mAh g −1 at 5 A g −1 , and stable cycling of 75% capacity retention after 500 cycles. In addition, the Zn storage kinetics is determined by the discharge process, during which SeS 5.76 @ 3D‐NPCF is converted into ZnSe and ZnS. More importantly, theoretical calculations reveal that Se can tailor the electron density difference, band structure, and reaction energy of S, which increase its conductivity and reactivity to facilitate the electrochemical reaction with Zn. This work explores high performance conversional cathode materials for aqueous Zn metal batteries and presents an effective strategy to modify their intrinsic properties.
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