期刊
CARBON
卷 170, 期 -, 页码 37-48出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.08.005
关键词
MnO/C microspheres; Dumbbell-like; Yolk-shell structure; Monodispersity; Lithiation evolution
资金
- National Natural Science Foundation of China [21704084, 21975206]
- Shaanxi Innovative Talents Promotion Plan-the Young Star of Science and Technology Project [2019KJXX-67]
- Fundamental Research Funds for the Central Universities [310201911cx023]
Herein, a novel dumbbell-like MnO/C microspheres with the yolk-shell structure, high monodispersity and regular morphology are successfully prepared by calcining precursors MnCO3/RF microspheres under the vacuum condition. The effects of calcination temperature on morphology, carbonization degrees of carbon shells and pore properties of MnO/C microspheres are systematically investigated. Benefited from the yolk-shell structure, reasonable distribution of MnO nanocrystals and porous structure, MnO/C microspheres prepared at 550 degrees C exhibit high reversible capacity of 852.6 mAh/g at 1.32C over 500 cycles, long-term cycling stability (888.4 mAh/g at 2.64C over 400 cycles) and excellent rate performance (454.39 mAh/g at 6.60C and 253.28 mAh/g at 13.20C are remained). Furthermore, the lithiation evolution of MnO/C microspheres in the long-term cycling process at nano- and micro-scales are revealed and the LiCoO2 parallel to MnO/C full cell present a great cyclic stability. Dumbbell-like MnO/C microspheres demonstrate potential applications for next-generation Li-ion batteries as anode materials profited from superior electrochemical performance. (C) 2020 Elsevier Ltd. All rights reserved.
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