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Title: Stress effects on the initial lithiation of crystalline silicon nanowires: Reactive molecular dynamics simulations using ReaxFF

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C4CP05198J· OSTI ID:1265270
 [1];  [2];  [2];  [2];  [1]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Harvard Univ., Cambridge, MA (United States)

Silicon (Si) has been recognized as a promising anode material for the next-generation high-capacity lithium (Li)-ion batteries because of its high theoretical energy density. Recent in situ transmission electron microscopy (TEM) revealed that the electrochemical lithiation of crystalline Si nanowires (c-SiNWs) proceeds by the migration of the interface between the lithiated Si (LixSi) shell and the pristine unlithiated core, accompanied by solid-state amorphization. The underlying atomic mechanisms of Li insertion into c-Si remain poorly understood. In this research, we perform molecular dynamics (MD) simulations using the reactive force field (ReaxFF) to characterize the lithiation process of c-SiNWs. Our calculations show that ReaxFF can accurately reproduce the energy barriers of Li migration from DFT calculations in both crystalline (c-Si) and amorphous Si (a-Si). The ReaxFF-based MD simulations reveal that Li insertion into interlayer spacing between two adjacent (111) planes results in the peeling-off of the (111) facets and subsequent amorphization, in agreement with experimental observations. We find that breaking of the Si–Si bonds between (111)-bilayers requires a rather high local Li concentration, which explains the atomically sharp amorphous–crystalline interface (ACI). Our stress analysis shows that lithiation induces compressive stress at the ACI layer, causing retardation or even the stagnation of the reaction front, also in good agreement with TEM observations. Lithiation at high temperatures (e.g. 1200 K) shows that Li insertion into c-SiNW results in an amorphous to crystalline phase transformation at Li : Si composition of ~4.2:1. In conclusion, our modeling results provide a comprehensive picture of the effects of reaction and diffusion-induced stress on the interfacial dynamics and mechanical degradation of SiNW anodes under chemo-mechanical lithiation.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265270
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 17, Issue 5; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 81 works
Citation information provided by
Web of Science

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Cited By (13)

Failure modes and mechanisms for rechargeable Lithium-based batteries: a state-of-the-art review journal November 2018
Evolving affinity between Coulombic reversibility and hysteretic phase transformations in nano-structured silicon-based lithium-ion batteries journal February 2018
Chemomechanical modeling of lithiation-induced failure in high-volume-change electrode materials for lithium ion batteries journal February 2017
Mechanical response of all-MoS 2 single-layer heterostructures: a ReaxFF investigation journal January 2016
Rare event simulations reveal subtle key steps in aqueous silicate condensation journal January 2017
Two-dimensional porous silicon nanosheets as anode materials for high performance lithium-ion batteries journal January 2019
New insights into Li diffusion in Li–Si alloys for Si anode materials: role of Si microstructures journal January 2019
Estimating Arrhenius parameters using temperature programmed molecular dynamics journal July 2016
Constructing first-principles phase diagrams of amorphous Li x Si using machine-learning-assisted sampling with an evolutionary algorithm journal June 2018
A simple local expression for the prefactor in transition state theory journal April 2019
Energy landscape and diffusion kinetics of lithiated silicon: A kinetic activation-relaxation technique study journal October 2017
Structural Damage of Few-Layer Silicene in Vertical and Parallel Lithiations journal January 2019
A simple local expression for the prefactor in transition state theory text January 2018

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