Abstract
The development of advanced electrode materials for sodium-ion batteries (SIBs) is crucial for the progression of energy storage technologies. In this study, we successfully fabricated V5S8/CoS nanoparticles confined within self-supported carbon nanofibers (CNFs) using a facile electrospinning method followed by a sulfidation process. Extensive characterization of the resulting V5S8/CoS-CNFs revealed their unique structural attributes, featuring a one-dimensional nanofiber morphology with enhanced Na+ transport pathways. In addition, V5S8 and CoS are typical semiconductors and have greater compatibility at the interface, which can enhance the synergistic effect in the composite. These V5S8/CoS-CNFs exhibited a remarkable reversible capacity of 201 mAh g−1 even at a high current density of 5 A g−1, along with a stable cycling performance of 165 mAh g−1 after 300 cycles at 2 A g−1. The incorporation of both V5S8 and CoS within the nanofiber structure substantially enhanced the pseudocapacitance effect, thereby improving sodium storage capabilities. The exceptional electrochemical properties of the binder-free V5S8/CoS-CNFs anode can be attributed to its heterogeneous composition embedded within CNFs. This composition effectively boosts the rate of sodium ion diffusion by generating a built-in electric field (BEF) at the V5S8 and CoS interface, alleviating volume stress during charge–discharge processes and enhancing overall conductivity. Our findings underscore the potential of V5S8/CoS-CNFs as high-performance anode materials for SIBs, offering valuable insights into the design and development of advanced electrode materials for future energy storage applications.
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Acknowledgements
The Zhejiang Provincial Key R&D Program (Grant No. 2023C04045) provided financial assistance for this project.
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Junjie Dai: experimental design, method research, data arrangement, investigation and analysis, paper writing. Fangshun Zhu: implementation of the experimental process, data collection, data collation, paper revision. Balaji Murugesan: research implementation, paper design, paper revision, technical support. Qing Zhang: experimental assistance, data acquisition. **aochong Zhou and Wenbin Ni: statistical analysis, research and technical support. Yurong Cai: programme design, project management, guidance support, final review of papers, funding.
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Dai, J., Zhu, F., Murugesan, B. et al. Synergistic V5S8/CoS nanoparticles-embedded carbon nanofiber as binder-free flexible anode for sodium-ion batteries. Ionics 30, 217–227 (2024). https://doi.org/10.1007/s11581-023-05268-5
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DOI: https://doi.org/10.1007/s11581-023-05268-5