Issue 12, 2021

Self-limiting lithiation of vanadium diboride nanosheets as ultra-stable mediators towards high-sulfur loading and long-cycle lithium sulfur batteries

Abstract

The high performance of lithium–sulfur (Li–S) batteries generally suffers from the sluggish reaction kinetics and notorious shuttle effect, resulting from the multi-phase/interface evolution and multistep electron-transfer/non-transfer processes. In this article, the novel vanadium diboride (VB2) nanosheet shows the self-limiting lithiation property in the 1.5–2.8 V polysulfide reaction range, which can afford better electron/ion transport under the stable reaction interface of the catalytic mediator in the Li–S cell cycling. Moreover, electrochemical measurements and density-functional theory calculations reveal that the boron sites of VB2 have a strong surface interaction with Li2S4, which can further improve the conversion rate between Li2S4 and Li2S2/Li2S. Thereinto, these VB2-based Li–S cells possess high sulfur loading (4 mg cm−2), impressive current rate (2C), excellent cycling stability (1000 cycles), and great rate capability (1013 mA h g−1 at 5 mA cm−2). This work provides insight into the stable structure to support the advancement of electrocatalysis technology.

Graphical abstract: Self-limiting lithiation of vanadium diboride nanosheets as ultra-stable mediators towards high-sulfur loading and long-cycle lithium sulfur batteries

Supplementary files

Article information

Article type
Paper
Submitted
29 Marts 2021
Accepted
19 Maijs 2021
First published
19 Maijs 2021

Sustainable Energy Fuels, 2021,5, 3134-3142

Self-limiting lithiation of vanadium diboride nanosheets as ultra-stable mediators towards high-sulfur loading and long-cycle lithium sulfur batteries

Y. Zhao, H. Yin, Z. Zhang, C. Lyu, X. Zhao, H. Xu, G. Lu, T. Qin, G. Ouyang, C. Zha and L. Wang, Sustainable Energy Fuels, 2021, 5, 3134 DOI: 10.1039/D1SE00466B

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