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K2[(VOHPO4)2(C2O4)]·2H2O as a High-Potential Cathode Material for Potassium-Ion Batteries
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  • Xiaogang Niu,
  • Nan Li,
  • Yifan Chen,
  • Jianwen Zhang,
  • Yusi Yang,
  • Lulu Tan,
  • Linlin Wang,
  • Zhe Zhang,
  • Jianghao Wu,
  • Lin Guo,
  • Yujie Zhu
Xiaogang Niu
Beihang University
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Nan Li
Beihang University
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Yifan Chen
Beihang University
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Jianwen Zhang
Beihang University
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Yusi Yang
Beihang University
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Lulu Tan
Beihang University
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Linlin Wang
Beihang University
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Zhe Zhang
Beihang University
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Jianghao Wu
Beihang University
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Lin Guo
Beihang University
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Yujie Zhu
Beihang University

Corresponding Author:yujiezhu@buaa.edu.cn

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Abstract

Potassium-ion batteries (KIBs) represent a promising energy storage solution owing to the abundance of potassium resources. The efficacy of KIBs relies significantly on the electrochemical attributes of both their electrode materials and electrolyte. In the current investigation, we synthesized a layered compound K2[(VOHPO4)2(C2O4)]·2H2O via a heterogeneous nucleation approach and assessed its viability as a cathode material for KIBs. When integrated with a salt-concentrated electrolyte with oxidation stability over 6 V, the compounds exhibits a high discharge potential of 4.1 V (vs. K+/K) alongside a reversible capacity of 106.2 mAh g−1. Furthermore, there is no capacity decay after 500 cycles at 100 mA g−1. This study shows the promise of layered metal organic frameworks as high-potential materials for KIBs.
Submitted to Battery Energy
05 Mar 2024Reviewer(s) Assigned
20 Mar 2024Reviewer(s) Assigned
02 Apr 2024Editorial Decision: Accept