Issue 48, 2022

Inspired by the Cu-driven conversion reaction: how anionic properties dictate the electrochemical performance of vanadium sulfide

Abstract

The so-called “activation process” of the VS2/SNC anode in sodium-ion batteries actually results from the Cu current collector-involved electrochemical reactions. Metallic Cu with a strong sulfiphilic property endows the VS2/SNC anode with a high reversible capacity of 586.9 mA h g−1 even after 500 cycles, but only when using the electrolyte of 1.0 M NaPF6 diglyme can such a favorable cycle stability be presented. Once the electrolyte of 1.0 M NaCF3SO3 diglyme is adopted, the device exhibits large overpotentials and its capacity decays dramatically. Examining the solvation structures and electrode/electrolyte interface properties, it is confirmed that the anionic property of the electrolyte plays a significant role in determining the electrochemical performance of metal sulfides. Triflate anions with a strong donicity not only aggravate the shuttle effect but also hinder the Na+ transport at the electrode/electrolyte interface, resulting in poor reversibility and sluggish kinetics of the anode, and such an interaction is intensified in Cu2S due to the soft acceptor characteristics of Cu (I).

Graphical abstract: Inspired by the Cu-driven conversion reaction: how anionic properties dictate the electrochemical performance of vanadium sulfide

Supplementary files

Article information

Article type
Paper
Submitted
07 Here 2022
Accepted
18 Du 2022
First published
18 Du 2022

J. Mater. Chem. A, 2022,10, 25575-25585

Inspired by the Cu-driven conversion reaction: how anionic properties dictate the electrochemical performance of vanadium sulfide

W. Yang, K. Wang, W. Zhou, N. Luo, S. Huang, Y. Li, K. N. Hui and M. Wei, J. Mater. Chem. A, 2022, 10, 25575 DOI: 10.1039/D2TA07832E

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