writer：Yu Huyan, Junjie Chen, Ke Yang, Qiuyu Zhang, Baoliang Zhang
keywords：anode electrode, carboxyl modification, lithium-ion batteries, manganese dioxide, tubular carbon nanofibers
source：期刊
specific source：JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Issue time：2020年

Three kinds of novel carboxyl modification tubular carbon nanofibers (CMTCFs) and MnO2 composites materials (CMTCFs/MnO2) are prepared by combining hypercrosslinking, 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.