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<p>In this study, bamboo-based hard carbon (HC) was selected as the research object, and a pre-oxidation strategy was employed to regulate the structure of the precursor. The effect of pre-oxidation time on the evolution of pore structure and sodium storage performance was systematically investigated. Structural analysis indicates that extending the pre-oxidation time facilitates the optimization of pore size distribution, promoting the collapse of mesopores and inducing the formation of closed pores. The as-prepared HC-12&#xa0;h anode material delivers an initial discharge specific capacity of 498.2 mAh g<sup>−1</sup> at a current density of 0.1 A g<sup>−1</sup>, with an initial Coulombic efficiency (ICE) of 84.3% and a plateau capacity contribution as high as 67.1%, demonstrating superior comprehensive performance compared to HC-5&#xa0;h and HC-7&#xa0;h. Kinetic analysis further reveals that the sodium storage process of HC-12&#xa0;h is dominated by surface-induced pseudocapacitive behavior, and it exhibits a faster sodium-ion diffusion coefficient.</p>

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Constructing high‑performance bamboo‑derived hard carbon anode materials for sodium‑ion batteries via a pre‑oxidation strategy

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Wenyue Yan,
  • Shenfeng Ding,
  • Hai Jia,
  • Zhiya Lin

摘要

In this study, bamboo-based hard carbon (HC) was selected as the research object, and a pre-oxidation strategy was employed to regulate the structure of the precursor. The effect of pre-oxidation time on the evolution of pore structure and sodium storage performance was systematically investigated. Structural analysis indicates that extending the pre-oxidation time facilitates the optimization of pore size distribution, promoting the collapse of mesopores and inducing the formation of closed pores. The as-prepared HC-12 h anode material delivers an initial discharge specific capacity of 498.2 mAh g−1 at a current density of 0.1 A g−1, with an initial Coulombic efficiency (ICE) of 84.3% and a plateau capacity contribution as high as 67.1%, demonstrating superior comprehensive performance compared to HC-5 h and HC-7 h. Kinetic analysis further reveals that the sodium storage process of HC-12 h is dominated by surface-induced pseudocapacitive behavior, and it exhibits a faster sodium-ion diffusion coefficient.