1. Yolk-shell structured V2O3 microspheres wrapped in N, S co-doped carbon as pea-pod nanofibers for high-capacity lithium ion batteries
- Author
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Anqiang Pan, Yaping Wang, Yanling Ai, Guozhong Cao, Wen-Wen Gou, Xiangzhong Kong, and Shuquan Liang
- Subjects
chemistry.chemical_classification ,Materials science ,General Chemical Engineering ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Industrial and Manufacturing Engineering ,Electrospinning ,0104 chemical sciences ,Anode ,Ion ,law.invention ,chemistry ,Chemical engineering ,law ,Nanofiber ,Environmental Chemistry ,Lithium ,Calcination ,0210 nano-technology - Abstract
High-capacity anode materials are widely studied for rechargeable batteries, which have the capability of storing more Li+ ions per formula. However, they normally experience large volume expansion and suffer inferior cycling stability. Herein, we propose pea-pod structured V2O3 yolk-shell microspheres@N, S co-doped carbon fiber network as an excellent anode material for lithium ion batteries. The prepared vanadium dioxide precursor is uniformly embedded into the carbon fibers by electrospinning treatment and further converted into V2O3 yolk-shell microspheres during the calcination process. The conductive carbon fiber framework which links V2O3 microspheres enhanced the electrical conductivity and structural stability significantly. Moreover, the co-doped N and S atoms derived from polymer could produce extrinsic defects, thereby improving Li+ diffusion and electrochemical active sites. When used as anodes for lithium ion batteries, the composite exhibits a high reversible capacity (793.7 mA h gā1 after 100 cycles at 100 mA gā1), excellent rate performance and cycle stability.
- Published
- 2019