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Self-assembly encapsulation of Si in N-doped reduced graphene oxide for use as a lithium ion battery anode with significantly enhanced electrochemical performance

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Abstract

Silicon is considered as an anode for next generation lithium ion batteries owing to its low discharge potential (∼0.4 V vs. Li/Li+) and high theoretical specific capacity (3500 mA h g−1). However, the drawbacks of Si, such as the low electronic conductivity, formation of an unstable solid electrolyte interphase (SEI), and extremely high volume expansion, limit its practical application. In this work, a silicon/nitrogen-doped reduced graphene oxide (Si/N-doped rGO) nanocomposite consisting of modified Si tightly wrapped in the rGO is prepared by a one-step hydrothermal process followed by carbonization. With nitrogen doping, the electronic conductivity and lithium-ion diffusion coefficient (DLi+) of the N-doped rGO are significantly improved. Meanwhile, the uniform distribution of Si particles along the N-doped rGO network and the intimate contact between them are able to efficiently buffer the volume change during repeated charge/discharge processes. Therefore, as compared with Si/rGO, the Si/N-doped rGO composite anode presents significantly improved electrochemical performance, delivering a reversible specific capacity as high as 1790 mA h g−1 with an initial coulombic efficiency of 77.6% and a capacity retention of 77.8% after 100 cycles at 200 mA g−1.

Graphical abstract: Self-assembly encapsulation of Si in N-doped reduced graphene oxide for use as a lithium ion battery anode with significantly enhanced electrochemical performance

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Publication details

The article was received on 17 Jan 2019, accepted on 04 Apr 2019 and first published on 04 Apr 2019


Article type: Paper
DOI: 10.1039/C9SE00027E
Citation: Sustainable Energy Fuels, 2019, Advance Article

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    Self-assembly encapsulation of Si in N-doped reduced graphene oxide for use as a lithium ion battery anode with significantly enhanced electrochemical performance

    X. Li, Y. Bai, M. Wang, G. Wang, Y. Ma, L. Li, B. Xiao and J. Zheng, Sustainable Energy Fuels, 2019, Advance Article , DOI: 10.1039/C9SE00027E

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