多硫化物
氧化还原
调解人
硫黄
材料科学
电化学
制作
纳米技术
相(物质)
动力学
工作(物理)
化学
电极
热力学
有机化学
物理
医学
替代医学
物理化学
病理
量子力学
内科学
电解质
冶金
作者
Yifan Ding,Zixiong Shi,Yingjie Sun,Jianghua Wu,Xiaoqing Pan,Jingyu Sun
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-03-13
卷期号:17 (6): 6002-6010
被引量:24
标识
DOI:10.1021/acsnano.3c00377
摘要
Mediator design has stimulated ever-increasing attention to help tackle a surge of detrimental caveats in Li-S realms, mainly pertaining to rampant polysulfide shuttling and sluggish redox kinetics. Nevertheless, universal designing philosophy, despite being highly sought-after, remains still elusive to date. Herein, we present a generic and simple material strategy to allow the target fabrication of advanced mediator toward boosted sulfur electrochemistry. This trick is done by the geometric/electronic comodulation of a prototype VN mediator, where the interplay of its triple-phase interface, favorable catalytic activity, and facile ion diffusivity is conducive to steering bidirectional sulfur redox kinetics. In laboratory tests, the thus-derived Li-S cells manifest impressive cyclic performances with a capacity decay rate of 0.07% per cycle over 500 cycles at 1.0 C. Moreover, under a sulfur loading of 5.0 mg cm-2, the cell could sustain a durable areal capacity of 4.63 mAh cm-2. Our work is anticipated to lay a theory-to-application foundation for rationalizing the design and modulation of reliable polysulfide mediators in working Li-S batteries.
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