Unlocking the Design Paradigm of In-Plane Heterojunction with Built-in Bifunctional Anion Vacancy for Unexpectedly Fast Sodium Storage

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Dingtao Ma
  • Zhehao Zhao
  • Yanyi Wang
  • Ming Yang
  • Yangwu Chen
  • Jianhui Zhu
  • Hongwei Mi
  • Peixin Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2310336
Journal / PublicationAdvanced Materials
Volume36
Issue number4
Online published27 Nov 2023
Publication statusPublished - 25 Jan 2024

Abstract

Transition metal chalcogenide (TMD) electrodes in sodium-ion batteries exhibit intrinsic shortcomings such as sluggish reaction kinetics, unstable conversion thermodynamics, and substantial volumetric strain effects, which lead to electrochemical failure. This report unlocks a design paradigm of VSe2−x/C in-plane heterojunction with built-in anion vacancy, achieved through an in situ functionalization and self-limited growth approach. Theoretical and experimental investigations reveal the bifunctional role of the Se vacancy in enhancing the ion diffusion kinetics and the structural thermodynamics of NaxVSe2 active phases. Moreover, this in-plane heterostructure facilitates complete face contact between the two components and tight interfacial conductive contact between the conversion phases, resulting in enhanced reaction reversibility. The VSe2−x/C heterojunction electrode exhibits remarkable sodium-ion storage performance, retaining specific capacities of 448.7 and 424.9 mAh g−1 after 1000 cycles at current densities of 5 and 10 A g−1, respectively. Moreover, it exhibits a high specific capacity of 353.1 mAh g−1 even under the demanding condition of 100 A g−1, surpassing most previous achievements. The proposed strategy can be extended to other V5S8−x and V2O5−x-based heterojunctions, marking a conceptual breakthrough in advanced electrode design for constructing high-performance sodium-ion batteries. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • bifunctional anion vacancy, in-plane heterojunction, reaction reversibility, sodium-ion batteries

Citation Format(s)

Unlocking the Design Paradigm of In-Plane Heterojunction with Built-in Bifunctional Anion Vacancy for Unexpectedly Fast Sodium Storage. / Ma, Dingtao; Zhao, Zhehao; Wang, Yanyi et al.
In: Advanced Materials, Vol. 36, No. 4, 2310336, 25.01.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review