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Electrospray Synthesis of Nano-Si Encapsulated in Graphite/carbon Microplates as Robust Anode for High Performance Lithium-ion Batteries

Abstract

Developing efficient Si-based anode materials for new-generation lithium-ion batteries (LIBs) has drawn extensive attention. Here, electrosprayed Si/graphite/carbon (Si/G/C) composite is explored as prominent anode materials for LIBs. The designed Si/G/C composite possesses a reasonable structure with nano-Si encapsulated in the conductive graphite flakes/amorphous carbon framework. The Si/G/C composite achieves superior reversible Li+ storage capability, showing a considerable discharge capacity of 832 mAh g-1 at 200 mA g-1. Besides, it realizes an encouraging capacity of ca. 400 mAh g-1 under high current density of 500 mA g-1 after 200 cycles. The excellent capacity and rate performances can be attributed to the structural benefits of the Si/G/C composite: (i) highly conductive graphite flakes serve as good dispersive scaffolds and electronic conductor, allowing for fast charge transfer and favorable ion diffusion. (ii) the amorphous carbon layer plays as protective coating to bind/fix nano-Si onto graphites and reduce the formation of unstable solid electrolyte interphase (SEI) film. (iii) both of the layered graphite and the amorphous carbon layer introduce adequate buffer space or voids to alleviate the volume changes of Si during Li+ insertion/extraction cycles. This high-capacitive and robust Si/graphite-based hybrid is attractive as alternative anode material toward practical rechargeable LIBs.

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Publication details

The article was received on 07 Nov 2017, accepted on 10 Jan 2018 and first published on 10 Jan 2018


Article type: Paper
DOI: 10.1039/C7SE00542C
Citation: Sustainable Energy Fuels, 2017, Accepted Manuscript
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    Electrospray Synthesis of Nano-Si Encapsulated in Graphite/carbon Microplates as Robust Anode for High Performance Lithium-ion Batteries

    W. Liu, Y. Zhong, S. Yang, S. Zhang, X. Yu, H. Wang, Q. Li, J. Li, X. Cai and Y. Fang, Sustainable Energy Fuels, 2017, Accepted Manuscript , DOI: 10.1039/C7SE00542C

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