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A Flower-like VO2(B)/V2CTx Heterojunction as High Kinetic Rechargeable Anode for Sodium-Ion Batteries
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  • Xiaoyu Jin,
  • Yongxin Huang,
  • Mengmeng Zhang,
  • Ziheng Wang,
  • Qianqian Meng,
  • Zhihang Song,
  • Li Li,
  • Feng Wu,
  • Renjie Chen
Xiaoyu Jin
Beijing Institute of Technology
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Yongxin Huang
Beijing Institute of Technology
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Mengmeng Zhang
Beijing Institute of Technology
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Ziheng Wang
Beijing Institute of Technology
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Qianqian Meng
Beijing Institute of Technology
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Zhihang Song
Beijing Institute of Technology
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Li Li
Beijing Institute of Technology
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Feng Wu
Beijing Institute of Technology
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Renjie Chen
Beijing Institute of Technology

Corresponding Author:chenrj@bit.edu.cn

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Abstract

VO2(B) is considered as a promising anode material for the next-generation sodium-ion batteries (SIBs) due to its accessible raw materials and considerable theoretical capacity. However, the VO2(B) electrode has inherent defects such as low conductivity and serious volume expansion, which hinder their practical application. Herein, a flower-like VO2(B)/V2CTx (VO@VC) heterojunction was prepared by a simple hydrothermal synthesis method with in situ growth. The flower-like structure composed of thin nanosheets alleviates the volume expansion, as well as the rapid Na+ transport pathways are built by the heterojunction structure, resulting in long-term cycling stability and superior rate performance. At a current density of 100 mA g-1, VO@VC anode can maintain a specific capacity of 276 mAh g-1 with an average coulombic efficiency of 98.7% after 100 cycles. Additionally, even at a current density of 2 A g-1, the VO@VC anode still exhibited a capacity of 132.9 mAh g-1 for 1000 cycles. The enhanced reaction kinetics can be attribute to the fast Na+ adsorption and storage at interfaces, which has been confirmed by the experimental and theoretical methods. These results demonstrate that the tailored nanoarchitecture design and additional surface engineering are effective strategies for optimizing vanadium-based anode.
19 Jul 2023Submitted to Battery Energy
20 Jul 2023Review(s) Completed, Editorial Evaluation Pending
20 Jul 2023Submission Checks Completed
20 Jul 2023Assigned to Editor
27 Jul 2023Reviewer(s) Assigned
25 Aug 2023Editorial Decision: Revise Minor
04 Sep 20231st Revision Received
04 Sep 2023Submission Checks Completed
04 Sep 2023Assigned to Editor
04 Sep 2023Review(s) Completed, Editorial Evaluation Pending
11 Sep 2023Reviewer(s) Assigned
19 Sep 2023Editorial Decision: Accept