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Title: In Situ and Ex Situ TEM Study of Lithiation Behaviours of Porous Silicon Nanostructures

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep31334· OSTI ID:1340852

In this work, we study the lithiation behaviours of both porous silicon (Si) nanoparticles and porous Si nanowires by in situ and ex situ transmission electron microscopy (TEM) and compare them with solid Si nanoparticles and nanowires. The in situ TEM observation reveals that the critical fracture diameter of porous Si particles reaches up to 1.52 μm, which is much larger than the previously reported 150 nm for crystalline Si nanoparticles and 870 nm for amorphous Si nanoparticles. After full lithiation, solid Si nanoparticles and nanowires transform to crystalline Li15Si4 phase while porous Si nanoparticles and nanowires transform to amorphous LixSi phase, which is due to the effect of domain size on the stability of Li15Si4 as revealed by the first-principle molecular dynamic simulation. Ex situ TEM characterization is conducted to further investigate the structural evolution of porous and solid Si nanoparticles during the cycling process, which confirms that the porous Si nanoparticles exhibit better capability to suppress pore evolution than solid Si nanoparticles. The investigation of structural evolution and phase transition of porous Si nanoparticles and nanowires during the lithiation process reveal that they are more desirable as lithium-ion battery anode materials than solid Si nanoparticles and nanowires.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1340852
Report Number(s):
PNNL-SA-115171; 48379; KP1704020
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

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Cited By (6)

Surface and Interface Engineering of Silicon-Based Anode Materials for Lithium-Ion Batteries journal July 2017
Porous amorphous silicon film anodes for high-capacity and stable all-solid-state lithium batteries journal May 2018
A review of magnesiothermic reduction of silica to porous silicon for lithium-ion battery applications and beyond journal January 2018
Two-dimensional porous silicon nanosheets as anode materials for high performance lithium-ion batteries journal January 2019
Real-time monitoring of stress development during electrochemical cycling of electrode materials for Li-ion batteries: overview and perspectives journal January 2019
Silicon: toward eco-friendly reduction techniques for lithium-ion battery applications journal January 2019

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