期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 15, 页码 5238-5246出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.06.034
关键词
SiOC; Flexible electrode; Electrospinning; N doped carbon fibers; Lithium-ion batteries
资金
- National Natural Science Foundation of China [51772237, 51777152]
- Natural Science Foundation of Shaanxi Province [2019JLZ-09]
- Characteristic Development Guidance Funds for the Central Universities
- Fundamental Research Funds for the Central Universities [XJJ2018055, XJJ2016020]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars
Silicon oxycarbide (SiOC) as a prospective electrode material for next-generation lithium ion batteries (LIBs) was restricted by the unsatisfactory discharge capacity and inflexibility used in flexible and wearable electronics. Herein, freestanding flexible SiOC/nitrogen-doped carbon fiber films are constructed through electrospinning process followed by carbonizing in NH3 atmosphere. In this way, SiOC particles are tightly embedded in N-doped carbon fibers, forming a 3D conductive network to promote electron transport and faster reaction kinetics. The nitrogen dopants create more defects in carbon fibers matrix, which improve the electronic conductivity and electrochemical active sites of the electrodes. Owing to the above synergistic effect, SiOC/nitrogen-doped carbon fiber electrodes exhibit a high initial Coulombic efficiency of 73 % and a reversible remaining capacity of 595 mA h g(-1) at 200 mA g(-1) even after 200 cycles. The electrodes with good flexibility can successfully drive a light-emitting diode even when the package battery is bended to 180 degrees.
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