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Two-dimensional Porous Silicon Nanosheets as Anode Materials for High Performance Lithium-ion Batteries

Abstract

In this paper, silicon nanosheets (Si-NSs) are chemically synthesized by using graphene oxide nanosheets as the template. The obtained Si-NSs, which are aggregations of silicon nanocrystals with size of ~10 nm, are applied directly as anode material for lithium ion batteries, delivering a reversible capacity of 800 mAh g-1 after 900 cycles at a rate as high as 8400 mA g-1. Ex-situ measurements and in-situ observations show the positive effect of mesoporous structure on the structual stability of Si-NSs. The evolution and survivability of the porous structures during lithiation and delithiation processes are investigated by molecular dynamics simulations, demonstrating that the porous structure can enhance the amount of “active” Li atoms during the stable stage of cycling and therefore promote mass capacity. The longer the survival of the porous structure, the longer the high mass capacity can be retained.

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Publication details

The article was received on 16 Feb 2019, accepted on 07 May 2019 and first published on 08 May 2019


Article type: Paper
DOI: 10.1039/C9NR01440C
Nanoscale, 2019, Accepted Manuscript

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    Two-dimensional Porous Silicon Nanosheets as Anode Materials for High Performance Lithium-ion Batteries

    J. Tang, Q. Yin, Q. Wang, Q. Li, H. Wang, Z. Xu, H. Yao, J. Yang, X. Zhou, J. Kim and L. Zhou, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR01440C

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