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Tailoring carboxyl tubular carbon nanofibers/MnO2 composites for high-performance lithium-ion battery anodes |
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| Authors: | Yu Huyan Junjie Chen Ke Yang Qiuyu Zhang Baoliang Zhang |
| Affiliation: | 1. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University Xi'an, China
Xi'an Key Laboratory of Functional Organic Porous Materials, Northwestern Polytechnical University, Xi'an, China;2. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University Xi'an, China |
| Abstract: | Three kinds of novel carboxyl modification tubular carbon nanofibers (CMTCFs) and MnO2 composites materials (CMTCFs/MnO2) are prepared by combining hyper-crosslinking, liquid phase oxidation and hydrothermal technology. The complex morphology and crystal phase of MnO2 in CMTCFs/MnO2 are effectively regulated by adjusting the hydrothermal reaction time. The δ-MnO2 nanosheet-wrapped CMTCFs (CMTCFs@MNS) are used as anode and compared with the other two CMTCFs/MnO2. Electrochemical analysis shows that CMTCFs@MNS electrode exhibits a large reversible capacity of 1497.1 mAh g?1 after 300 cycles at 1000 mA g?1 and a long cycling reversible capacity of 400.8 mAh g?1 can be maintained after 1000 cycles at 10 000 mA g?1. CMTCFs@MNS manifests an average reversible capacity of 256.32 mAh g?1 at 10 000 mA g?1 after twelve changes in current density. In addition, the structural superiority of CMTCFs@MNS electrode is clarified by characterizing the microscopic morphology and crystal phase of the electrode after electrochemical performance test. |
| Keywords: | anode electrode carboxyl modification lithium-ion batteries manganese dioxide tubular carbon nanofibers |
