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

The so-called "activation process" of the VS 2 /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 VS 2 /SNC anode with a high reversible capacity of 586.9 mA h g −1...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-12, Vol.1 (48), p.25575-25585
Main Authors: Yang, Wenjuan, Wang, Kaihong, Zhou, Wenbo, Luo, Ningjing, Huang, Shuping, Li, Yafeng, Hui, Kwun Nam, Wei, Mingdeng
Format: Article
Language:English
Subjects:
Anions
Batteries
Chemical reactions
Copper
Copper sulfides
Electrochemical analysis
Electrochemistry
Electrodes
Electrolytes
Interfacial properties
Metal sulfides
Sodium
Sodium-ion batteries
Solvation
Sulfides
Vanadium
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Summary:The so-called "activation process" of the VS 2 /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 VS 2 /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 NaPF 6 diglyme can such a favorable cycle stability be presented. Once the electrolyte of 1.0 M NaCF 3 SO 3 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 Cu 2 S due to the soft acceptor characteristics of Cu ( i ). The anionic properties of electrolytes play a significant role in determining the electrochemical performance of VS 2 /SNC anodes, which is interpreted from the angle of solvation effect and corresponding electrode/electrolyte interface properties.
ISSN:2050-7488
2050-7496
DOI:10.1039/d2ta07832e