Activating the high-potential V4+/V5+ redox couple for an advanced NASICON sodium-ion cathode

Miaomiao Wang; Lin Zhu; Shuang Xiang; Xiaobing Huang; Huanhuan Li; Haiyan Wang; Yougen Tang; Dan Sun

doi:10.1039/D5CC00157A

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Activating the high-potential V⁴⁺/V⁵⁺ redox couple for an advanced NASICON sodium-ion cathode†

Miaomiao Wang,^a Lin Zhu,^a Shuang Xiang,^a Xiaobing Huang,^b Huanhuan Li,

^c Haiyan Wang,

^a Yougen Tang

^a and Dan Sun

*^a

Author affiliations

* Corresponding authors

^a Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, P. R. China
E-mail: sundan4330@csu.edu.cn

^b College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000, Hunan, China

^c School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, P. R. China

Abstract

Na_2.5V_1.3Cr_0.2Ti_0.5(PO₄)₃ with multi-electron redox reactions is designed for high-energy-density sodium-ion batteries. The partial Cr substitution achieves high-potential V activation, achieving an ultra-high capacity of 183.07 mA h g⁻¹ at 20 mA g⁻¹ with 89% retention after 1500 cycles at 1 A g⁻¹. Combined theoretical and experimental analyses confirm the activation mechanism of the V⁴⁺/V⁵⁺ redox couple after Cr doping.

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Article information

DOI: https://doi.org/10.1039/D5CC00157A
Article type: Communication
Submitted: 10 Jan 2025
Accepted: 13 Feb 2025
First published: 13 Feb 2025

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Chem. Commun., 2025, Advance Article

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Activating the high-potential V⁴⁺/V⁵⁺ redox couple for an advanced NASICON sodium-ion cathode

M. Wang, L. Zhu, S. Xiang, X. Huang, H. Li, H. Wang, Y. Tang and D. Sun, Chem. Commun., 2025, Advance Article , DOI: 10.1039/D5CC00157A

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