期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 757, 期 -, 页码 265-272出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.05.076
关键词
Yolk structure C/SiO2/C composites; Lithium-ion batteries; Quickly activated SiO2
资金
- National Natural Science Foundation of China [51772083, 51472083, 51402101]
- Hunan Provincial Natural Science Foundation of China [14JJ3059, 2017JJ2008]
- Growth Scheme for Young Teachers of Hunan University [531107040185]
- Key R & D projects of Hunan Province [2016GK2036]
A yolk structure of C/SiO2/C and a hollow structure of C/SiO2 composites with porous feature are synthesized by one-step method and two steps method, respectively. When evaluate as an anode material for lithium-ion batteries (LIBs), the C/SiO2/C and C/SiO2 deliver an impressive cycle performance and exhibit an excellent rate capacity. More importantly, attributing to the one-step synthesis method of C/SiO2/C, it possesses interconnected micropore and higher special surface area, which provide a more efficient ionic transportation path and facilitate the diffusion of Li+ between the electrolyte and C/SiO2/C, thus the activation time of SiO2 can be effectively shorten. The capacity achieves the steady value of 1135 mAh g(-1) (based on the weight of SiO2 in the electrode material) only by 60 cycles at 50 mAg(-1) which is much faster than that of C/SiO2 and delivers a high-rate capacity of 390 mAh g(-1) at 1000 mA g(-1). Considering the good lithium storage abilities and fast-activated features, the C/SiO2/C composites hold promise in applications in practical LIBs. (C) 2018 Elsevier B.V. All rights reserved.
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