Issue 3, 2018

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

Graphical abstract: Electrospray synthesis of nano-Si encapsulated in graphite/carbon microplates as robust anodes for high performance lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
07 Nov 2017
Accepted
10 Jan 2018
First published
10 Jan 2018

Sustainable Energy Fuels, 2018,2, 679-687

Electrospray synthesis of nano-Si encapsulated in graphite/carbon microplates as robust anodes 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, 2018, 2, 679 DOI: 10.1039/C7SE00542C

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