Nitrogen-doped carbon-coated cotton-derived carbon fibers as high-performance anode materials for lithium-ion batteries
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Nitrogen-doped carbon-coated cotton-derived carbon fibers (NC@CCFs) were prepared by using cotton fibers as substrate and ionic liquid [HMIm]N(CN)2 as source of carbon and nitrogen. The scanning electron microscopy, EDS element map, and X-ray photoelectron spectroscopy indicated that N-doped carbon uniformly coated on cotton-derived carbon fibers and the N element was successfully doped into NC@CCFs materials. This structure effectively improved the structural stability of NC@CCFs. The highly conductive CCFs provided conductivity network for electron transport in the NC@CCFs. Nitrogen doping provided abundant active sites and introduced many defects, which increased the lithium storage active sites of NC@CCFs. Therefore, the NC@CCFs anode shows excellent cycle stability (614.3 mAhg−1 at 0.5 C after 250 cycles) and rate performance when used in lithium-ion battery.
KeywordsN-doped carbon Ionic liquid Cotton-derived carbon fibers Lithium-ion batteries
The authors received support from the National Natural Science Foundation of China (NFSC) (grant nos. 51364024, 51404124) and from the Faculty Research Seed Grants Program of Georgia Southern University.
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Conflict of interest
The authors declare that they have no conflict of interest.
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