Two-dimensional porous silicon nanosheets as anode materials for high performance lithium-ion batteries

Jingjing Tang, Qifang Yin, Qian Wang, Qianqian Li, Hongtao Wang, Zhenglong Xu, Haimin Yao, Juan Yang, Xiangyang Zhou, Jang Kyo Kim, Limin Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

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 a size of ∼10 nm, are applied directly as the anode material for lithium ion batteries, delivering a reversible capacity of 800 mA h 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 the mesoporous structure on the structural 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.

Original languageEnglish
Pages (from-to)10984-10991
Number of pages8
JournalNanoscale
Volume11
Issue number22
DOIs
Publication statusPublished - 14 Jun 2019

ASJC Scopus subject areas

  • Materials Science(all)

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