作者：Yu Huyan, Junjie Chen, Ke Yang, Qiuyu Zhang, Baoliang Zhang
关键字：anode electrode, carboxyl modification, lithium-ion batteries, manganese dioxide, tubular carbon nanofibers
论文来源：期刊
具体来源：JOURNAL OF THE AMERICAN CERAMIC SOCIETY
发表时间：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.