Journal
NANOSCALE
Volume 11, Issue 22, Pages 10984-10991Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr01440c
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Funding
- Research Grants Council of the Hong Kong Special Administration Region [PolyU 5293/13E, PolyU 152064/15E]
- Hong Kong Polytechnic University [G-YBLF, 1-ZVJD, 1-ZVGH, G-YW0M]
- National Natural Science Foundation of China [51802354, 51871247]
- National Science Foundation of China [51702207]
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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 similar to 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.
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