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0 25040107

DOI: https://doi.org/10.6023/A25040107

Article

Fluorine Doping-Induced Intrinsic Defect Modulation in Rock-Salt-Type High-Entropy Oxide for Lithium Storage Performance Optimization

  • Wei Zhengbing ,
  • Xu Shibiao ,
  • Bao Mengfan ,
  • Chen Shijie ,
  • Lin Na ,
  • Mao Aiqin
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  • aSchool of Materials Science and Engineering, Anhui University of Technology, Ma’anshan;
    bAdvanced Ceramics Research Center, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan

Received date: 2025-04-03

  Online published: 2025-06-30

Supported by

Project supported by the University Natural Science Research Project of Anhui Province in P.R. China (No. 2023AH051104), and the Open Project of Anhui Province Key Laboratory of Efficient Conversion and Solid-State Storage of Hydrogen & Electricity (No. ECSSHE2024KF05).

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Abstract

High-entropy oxides (HEOs) have emerged as one of the most promising anode materials for lithium-ion batteries due to their flexible compositional design and synergistic effects among multiple components. However, their practical application is severely hindered by inferior intrinsic electronic/ionic conductivity, which leads to poor rate capability and cycling stability in lithium storage systems. In this study, we developed a fluorine anion doping strategy to regulate intrinsic defects including lattice distortion and oxygen vacancies in rock-salt type (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O through solution combustion synthesis. This approach successfully fabricated single-phase F-doped (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O1-xFx (x = 0, 0.05, 0.1) HEO anode materials. Electrochemical evaluations demonstrate that the (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O0.95F0.05 anode exhibits exceptional rate performance and cycling stability, delivering a high specific capacity of 389.5 mAh·g-1 after 150 cycles at 200 mA g-1. Even under high current density of 1000 mA g-1, it maintains 233.4 mAh g-1 after 150 cycles with 93.1% capacity retention, representing a 56% improvement compared to undoped counterparts. The enhanced electrochemical performance originates from optimized material characteristics induced by appropriate F- doping: increased specific surface area, elevated surface Cu+ content, reduced lattice distortion, and controlled oxygen vacancies. These structural modifications not only provide additional active sites and ion transport pathways but also enhance surface pseudocapacitive behavior, thereby significantly improving both electronic and ionic transport kinetics.

Key words： Lithium-ion battery anode materials; rock salt-type high-entropy oxides; anion doping; lattice distortion; oxygen vacancies

Cite this article

Wei Zhengbing , Xu Shibiao , Bao Mengfan , Chen Shijie , Lin Na , Mao Aiqin . Fluorine Doping-Induced Intrinsic Defect Modulation in Rock-Salt-Type High-Entropy Oxide for Lithium Storage Performance Optimization[J]. Acta Chimica Sinica, 0 : 25040107 . DOI: 10.6023/A25040107

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