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Side-by-side observation of the interfacial improvement of vertical graphene-coated silicon nanocone anodes for lithium-ion batteries by patterning technology

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Abstract

We report that vertical graphene coating can greatly improve the electrochemical performance and the interfacial stability of silicon nanocone (SNC) anodes for lithium-ion batteries. The coating patterning technology is innovatively employed for side-by-side demonstration of the exclusive influences of graphene coating on the solid–electrolyte interphase (SEI) formation and the structural stability of the SNC electrode. The silicon nanocone–graphene (SNC-G) electrode achieves a longer cycle life (1715 cycles), higher Coulombic efficiency (average 98.2%), better rate capability, and lower electrode polarization than the SNC electrode. The patterning of the graphene coating provides a much direct and convincing morphological comparison between the SNC-G structure and the SNC structure, showing clearly that the SNC-G area maintains a thin SEI layer and stable nanostructure after cycling, while the SNC area is gradually damaged and covered with a thick SEI layer after 100 cycles. Our results clearly indicate the improved electrochemical performance and interfacial stability attributed to the vertical graphene coating, and the as-proposed patterning technology also paves a new way for comparative research on coating materials for lithium-ion batteries.

Graphical abstract: Side-by-side observation of the interfacial improvement of vertical graphene-coated silicon nanocone anodes for lithium-ion batteries by patterning technology

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Publication details

The article was received on 07 Jun 2017, accepted on 25 Jul 2017 and first published on 26 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR04041E
Citation: Nanoscale, 2017, Advance Article
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    Side-by-side observation of the interfacial improvement of vertical graphene-coated silicon nanocone anodes for lithium-ion batteries by patterning technology

    C. Wang, F. Luo, H. Lu, B. Liu, G. Chu, B. Quan, J. Li, C. Gu, H. Li and L. Chen, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR04041E

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