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
作者： Wang, Xilong 1 ; Zhang, Deng 1 ; Zheng, Qiaotian 1 ; Song, Jie 1 ; Chen, Dawei 1 ; Yan, Debing 1 ; He, Bin 1 ; Xiao, Dan 2 ; Meng, Yan 2 ; Ying, Jing 3 ; Zhao, Qian 1 ; Tang, Mao 1 ;
作者机构： 1.Chengdu Univ, Sch Mech Engn, Chengdu 610106, Peoples R China
2.Sichuan Univ, Inst New Energy & Low Carbon Technol, Chengdu 610065, Peoples R China
3.Sichuan Acad Agr Machinery Sci, Key Lab Agr Equipment Technol Hilly & Mountainous, Chengdu 610066, Peoples R China
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.
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