Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 775, Issue -, Pages 790-799Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.10.205
Keywords
SnO2 monocrystal; Carbon network; Chemical bonding; Anode material; Lithium ion battery
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Funding
- National Natural Science Foundation of China [21703147, U1401248]
- Natural Science Foundations for the Young Scientist of Jiangsu Province [BK20170338]
- China Postdoctoral Science Foundation [2016M601876]
- Open Fund of Jiangsu Key Laboratory of Materials and Technology for Energy Conversion [MTEC-2017M01]
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SnO2 monocrystals with an average particle size of -10 nm have been in situ embedded in a tridimensional carbon network (marked as SnO2@C) with a high loading percentage of 39.5 wt%. The synthetic mechanism of SnO2@C nanocomposite is discussed. The X-ray photoelectron spectroscopies demonstrate probable chemical bonding between SnO2 nanoparticles and the carbon framework for enhanced lithium storage performance of SnO2@C nanocomposite as an anode material for lithium ion batteries. The SnO2@C anode material delivers an initial charge capacity of 844 mAh/g at 0.1 C, and can retain a specific capacity of 661 mAh/g after 700 electrochemical cycles at 1 C (1 C = 0.79 A/g), showing considerably improved cycling and high-rate performance as compared with the bare Sn0 2 material. The high lithium storage capacity of SnO2@C anode material can be attributed to electrochemical reversibility related to the reduction of SnO to Sn and corresponding re-oxidation process, according to a reversible redox pair at 1.10/1.25 V recorded in CV cycles. The SnO2@C anode also reveals outstanding cycling stability at elevated temperature, resulting in a remaining capacity of 512 mAh/g after 125 cycles at 1 C and 233 mAh/g after 300 cycles at 5 C at 55 degrees C, respectively. TEM/HRTEM images show desirable structural integrity of cycled SnO2@C nanocomposite and the robustness of the carbon network, which significantly contributes to superior lithium storage performance. (C) 2018 Elsevier B.V. All rights reserved.
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