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Controlling the Sn-C bonds content in SnO2@CNTs composite to form in-situ pulverized structure for enhanced electrochemical kinetics

Abstract

The Sn-C bonding content between the SnO2 and CNTs interface was controlled by the hydrothermal method and subsequent heat treatment. Electrochemical analysis found that the SnO2@CNTs with high Sn-C bonding content exhibited much higher capacity contribution from alloying and conversion reaction compared with the low content of Sn-C bonding even after 200 cycles. Since the high Sn-C bonding content enabled the SnO2 nanoparticles to stabilize on the CNTs surface, realizing an in-situ pulverization process of SnO2. The in-situ pulverized structure was beneficial to maintain the closely electrochemical contact of working electrode during the long-term cycling and provide ultrafast transfer paths for lithium ions and electrons, which promoted the alloying and conversion reaction kinetics greatly. Therefore, the SnO2@CNTs composite with high Sn-C bonding content displayed highly reversible alloying and conversion reaction. It is believed that the conclusion could be used as a reference for design chemically bonded metal oxide/carbon composite anode materials in lithium-ion batteries.

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Publication details

The article was received on 28 Jul 2017, accepted on 06 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR05556K
Citation: Nanoscale, 2017, Accepted Manuscript
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    Controlling the Sn-C bonds content in SnO2@CNTs composite to form in-situ pulverized structure for enhanced electrochemical kinetics

    Y. Cheng, J. Huang, H. Qi, L. CAO, X. Luo, J. Li, Z. Xu and J. Yang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05556K

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