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<p>The development of high-performance anode materials is crucial for lithium-ion battery. This work presents a strategic design of carbon quantum dots (CQDs) modified amorphous-dominated high-entropy oxide (FeCoNiCrMn)<sub>3</sub>O<sub>4</sub> (FCNCMO) synthesized via a combined hydrothermal and calcination approach as anode material for lithium-ions batteries. Systematic characterization reveals that CQDs form conductive bridges between particles, not only enhancing interparticle electron transport but also acting as an elastic buffer layer to suppress volume variations during cycling, while simultaneously refining the particle size from 433.6&#xa0;nm (pristine FCNCMO) to 254.8&#xa0;nm (FCNCMO/CQDs-10) and preventing particle aggregation to provide larger specific surface area 330.38 m<sup>2</sup> g<sup>− 1</sup>, thereby providing more active sites for electrochemical reactions. Electrochemical tests demonstrate that the optimal FCNCMO/CQDs-10 composite delivers a high discharge capacity of 515.9 mAh g<sup>− 1</sup> after 200 cycles at 200 mA g<sup>− 1</sup>, significantly surpassing pristine FCNCMO (302.1 mAh g<sup>− 1</sup>). This composite also exhibits outstanding rate capability, delivering 190.2 mAh g<sup>− 1</sup> at high current density of 2 A g<sup>− 1</sup> while recovering to 831.6 mAh g<sup>− 1</sup> when current density returns to 0.1&#xa0;A g<sup>− 1</sup>. This study provides a valuable strategy of stabilizing amorphous-dominated structures for developing high-performance HEO anodes.</p>

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Carbon quantum Dots modified amorphous-dominated high-entropy oxide (FeCoNiCrMn)3O4 as high-performance anodes for lithium ions storage

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Kangwei Hou,
  • Xinhao Chang,
  • Xiaolin Li,
  • Li Wang,
  • Guangchuan Liang

摘要

The development of high-performance anode materials is crucial for lithium-ion battery. This work presents a strategic design of carbon quantum dots (CQDs) modified amorphous-dominated high-entropy oxide (FeCoNiCrMn)3O4 (FCNCMO) synthesized via a combined hydrothermal and calcination approach as anode material for lithium-ions batteries. Systematic characterization reveals that CQDs form conductive bridges between particles, not only enhancing interparticle electron transport but also acting as an elastic buffer layer to suppress volume variations during cycling, while simultaneously refining the particle size from 433.6 nm (pristine FCNCMO) to 254.8 nm (FCNCMO/CQDs-10) and preventing particle aggregation to provide larger specific surface area 330.38 m2 g− 1, thereby providing more active sites for electrochemical reactions. Electrochemical tests demonstrate that the optimal FCNCMO/CQDs-10 composite delivers a high discharge capacity of 515.9 mAh g− 1 after 200 cycles at 200 mA g− 1, significantly surpassing pristine FCNCMO (302.1 mAh g− 1). This composite also exhibits outstanding rate capability, delivering 190.2 mAh g− 1 at high current density of 2 A g− 1 while recovering to 831.6 mAh g− 1 when current density returns to 0.1 A g− 1. This study provides a valuable strategy of stabilizing amorphous-dominated structures for developing high-performance HEO anodes.