Tailoring sodium storage with phosphorus-doped hollow carbon nanospheres: Atomic-level engineering of charge transport and ion dynamics

文献类型： 外文期刊

第一作者： Wang, Xilong

作者： Wang, Xilong;Zhang, Deng;Zheng, Qiaotian;Song, Jie;Chen, Dawei;Yan, Debing;He, Bin;Zhao, Qian;Tang, Mao;Xiao, Dan;Meng, Yan;Ying, Jing

作者机构：

关键词： Cassava starch; Phytic acid; Hollow nanosphere; Hard carbon; Sodium-ion batteries

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 520 卷

页码：

收录情况： SCI

摘要： Rising energy demands and environmental concerns highlight the need for sustainable storage, with sodium-ion batteries (SIBs) gaining attention for their low cost and abundant sodium resources. This study utilized cassava starch as a biomass precursor and employed phytic acid-assisted phosphorus (P) doping to fabricate a hard carbon material (COP-HC-1200) with a hollow nanosphere structure and abundant hierarchical porosity. P doping significantly expands the graphite interlayer spacing, optimizes the electronic structure, and provides ample pathways for rapid Na+ diffusion and intercalation. Electrochemical tests demonstrate that COP-HC-1200 possesses a high initial coulombic efficiency of 81.5 %. After 1000 cycles at 0.1 A g- 1, it retains a capacity of 405.5 mAh g- 1 with a retention rate of 88.5 %. Despite being subjected to a high current density of 10 A g- 1, it delivers a stable capacity of 191.2 mAh g- 1 over 5000 cycles. DFT calculations reveal that P optimizes defect levels, reduces irreversible adsorption, and increases electronic states near the Fermi level, thereby enhancing conductivity and electrochemical properties. Furthermore, In-situ EIS, Raman, and XRD analyses, collectively provide insights into the Na+ transport and storage mechanisms. This work provides valuable insights for the design of low-cost, environmentally friendly, and long-life hard carbon anodes for SIBs.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序