High‐rate sodium‐ion storage of vanadium nitride via surface‐redox pseudocapacitance

Qiulong Wei; Tingyi Huang; Xiaojuan Huang; Binhao Wang; Yalong Jiang; Dafu Tang; Dong‐Liang Peng; Bruce Dunn; Liqiang Mai

doi:10.1002/idm2.12080

Interdisciplinary Materials (May 2023)

High‐rate sodium‐ion storage of vanadium nitride via surface‐redox pseudocapacitance

Qiulong Wei,
Tingyi Huang,
Xiaojuan Huang,
Binhao Wang,
Yalong Jiang,
Dafu Tang,
Dong‐Liang Peng,
Bruce Dunn,
Liqiang Mai

Affiliations

Qiulong Wei: Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials Xiamen University Xiamen China
Tingyi Huang: Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials Xiamen University Xiamen China
Xiaojuan Huang: Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials Xiamen University Xiamen China
Binhao Wang: Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials Xiamen University Xiamen China
Yalong Jiang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China
Dafu Tang: Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials Xiamen University Xiamen China
Dong‐Liang Peng: Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials Xiamen University Xiamen China
Bruce Dunn: Department of Materials Science and Engineering University of California Los Angeles Los Angeles California USA
Liqiang Mai: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

DOI: https://doi.org/10.1002/idm2.12080
Journal volume & issue: Vol. 2, no. 3
pp. 434 – 442

Abstract

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Abstract Vanadium nitride (VN) electrode displays high‐rate, pseudocapacitive responses in aqueous electrolytes, however, it remains largely unclear in nonaqueous, Na+‐based electrolytes. The traditional view supposes a conversion‐type mechanism for Na+ storage in VN anodes but does not explain the phenomena of their size‐dependent specific capacities and underlying causes of pseudocapacitive charge storage behaviors. Herein, we insightfully reveal the VN anode exhibits a surface‐redox pseudocapacitive mechanism in nonaqueous, Na+‐based electrolytes, as demonstrated by kinetics analysis, experimental observations, and first‐principles calculations. Through ex situ X‐ray photoelectron spectroscopy and semiquantitative analyses, the Na+ storage is characterized by redox reactions occurring with the V5+/V4+ to V3+ at the surface of VN particles, which is different from the well‐known conversion reaction mechanism. The pseudocapacitive performance is enhanced through nanoarchitecture design via oxidized vanadium states at the surface. The optimized VN‐10 nm anode delivers a sodium‐ion storage capability of 106 mAh g−1 at the high specific current of 20 A g−1, and excellent cycling performance of 5000 cycles with negligible capacity losses. This work demonstrates the emerging opportunities of utilizing pseudocapacitive charge storage for realizing high‐rate sodium‐ion storage applications.

Published in Interdisciplinary Materials

ISSN: 2767-4401 (Print); 2767-441X (Online)
Publisher: Wiley
Country of publisher: Australia
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://onlinelibrary.wiley.com/journal/2767441x

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