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Molecular dynamics simulations of the first charge of a Li-ion—Si-anode nanobattery

Journal Article · · Journal of Molecular Modeling
 [1];  [2];  [3]
  1. Texas A & M Univ., College Station, TX (United States). Department of Chemical Engineering; Texas A&M University
  2. Texas A & M Univ., College Station, TX (United States). Department of Chemical Engineering
  3. Texas A & M Univ., College Station, TX (United States). Department of Chemical Engineering, Department of Electrical and Computer Engineering and Department of Materials Science and Engineering
Rechargeable lithium-ion batteries are the most popular devices for energy storage but still a lot of research needs to be done to improve their cycling and storage capacity. Silicon has been proposed as an anode material because of its large theoretical capacity of ~3600 mAh/g. Therefore, focus is needed on the lithiation process of silicon anodes where it is known that the anode increases its volume more than 300%, producing cracking and other damages. In this study, we performed molecular dynamics atomistic simulations to study the swelling, alloying, and amorphization of a silicon nanocrystal anode in a full nanobattery model during the first charging cycle. A dissolved salt of lithium hexafluorophosphate in ethylene carbonate was chosen as the electrolyte solution and lithium cobalt oxide as cathode. External electric fields are applied to emulate the charging, causing the migration of the Li-ions from the cathode to the anode, by drifting through the electrolyte solution, thus converting pristine Si gradually into Li14Si5 when fully lithiated. When the electric field is applied to the nanobattery, the temperature never exceeds 360 K due to a temperature control imposed resembling a cooling mechanism. The volume of the anode increases with the amorphization of the silicon as the external field is applied by creating a layer of LiSi alloy between the electrolyte and the silicon nanocrystal and then, at the arrival of more Li-ions changing to an alloy, where the drift velocity of Li-ions is greater than the velocity in the initial nanocrystal structure. Charge neutrality is maintained by concerted complementary reduction-oxidation reactions at the anode and cathode, respectively. Also, the nanobattery model developed here can be used to study charge mobility, current density, conductance and resistivity, among several other properties of several candidate materials for rechargeable batteries and constitutes the initial point for further studies on the formation of the solid electrolyte interphase in the anode.
Research Organization:
Texas A&M Engineering Experiment Station, College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-05CH11231; EE0007766
OSTI ID:
1430651
Journal Information:
Journal of Molecular Modeling, Journal Name: Journal of Molecular Modeling Journal Issue: 4 Vol. 23; ISSN 1610-2940
Publisher:
Springer-VerlagCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

DFT study of nano zinc/copper voltaic cells journal March 2018
Investigating the effects of vacancies on self-diffusion in silicon clusters using classical molecular dynamics journal September 2018
Review on modeling of the anode solid electrolyte interphase (SEI) for lithium-ion batteries journal March 2018
Dendrite formation in silicon anodes of lithium-ion batteries journal January 2018
Dendrite formation in Li-metal anodes: an atomistic molecular dynamics study journal January 2019
Localized high concentration electrolyte behavior near a lithium–metal anode surface journal January 2019
Ab Initio Study of the Interface of the Solid-State Electrolyte Li 9 N 2 Cl 3  with a Li-Metal Electrode journal January 2019
Sigma-Holes in Battery Materials Using Iso-Electrostatic Potential Surfaces journal January 2018

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