期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 876, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114483
关键词
Potassium ion batteries; Electrospinning; CuO/Cu-NCNFs anode materials; Microfibers
资金
- National Natural Science Foundation of China [51772169, 51572151]
- National Key R&D Program of China [2018YFB0905400]
- Major Technological Innovation Project of Hubei Science and Technology Department [2019AAA164]
- Natural Science Foundation of Hubei Province of China [2019CFB337]
- Natural Science Foundation of Hubei Provincial Department of Education [Q20191204]
- 111 Project of Hubei Province [2018-19-1]
- Research Found for Excellent Dissertation of China Three Gorges University
In light of the sluggish potassiation kinetics in potassium ion batteries, herein, we report a self-supported anode material composed of CuO/Cu clusters distributed in nitrogen-doped carbon microfibers (CuO/Cu-NCNFs electrode) via a simple electrospinning technology. By this way, a three-dimensional conductive networks interwoven by CuO/Cu-NCNFs microfibers were successfully obtained. As expected, this self-supported anodematerials for potassiumion batteries reveals better electrochemical performance compared with nitrogen-doped carbon microfibers (NCNFs). There is still a reversible capacity of 205.9 mAh g(-1) remained for the CuO/Cu-NCNFs electrode undergoing 100 cycles at 100 mA g(-1). With the in-depth investigation, the CuO/Cu-NCNFs show more obvious pseudocapacitive characteristic than that of NCNFs. The improved capacitive contribution discloses the reason for the fast kinetics of CuO/Cu-NCNFs. It is believed that the presence of CuO/Cu significantly favors the advancement of mechanical property and stability of microfiber networks, giving rise to the fast kinetics of CuO/Cu-NCNFs. It can be predicted that this innovative potocol of CuO/Cu-NCNFs microfiber frameworks will provide explicit direction toward engineering high performance electrode materials for potassium ion batteries. (C) 2020 Elsevier B.V. All rights reserved.
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