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Understanding the degradation of a model si anode in a li-ion battery at the atomic scale.

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Title: Understanding the degradation of a model si anode in a li-ion battery at the atomic scale.
Authors: Kim, S-H
Dong, K
Zhao, H
El-Zoka, AA
Zhou, X
Woods, EV
Giuliani, F
Manke, I
Raabe, D
Gault, B
Item Type: Journal Article
Abstract: To advance the understanding of the degradation of the liquid electrolyte and Si electrode, and their interface, we exploit the latest developments in cryo-atom probe tomography. We evidence Si anode corrosion from the decomposition of the Li salt before charge-discharge cycles even begin. Volume shrinkage during delithiation leads to the development of nanograins from recrystallization in regions left amorphous by the lithiation. The newly created grain boundaries facilitate pulverization of nanoscale Si fragments, and one is found floating in the electrolyte. P is segregated to these grain boundaries, which confirms the decomposition of the electrolyte. As structural defects are bound to assist the nucleation of Li-rich phases in subsequent lithiations and accelerate the electrolyte's decomposition, these insights into the developed nanoscale microstructure interacting with the electrolyte contribute to understanding the self-catalyzed/accelerated degradation Si anodes and can inform new battery designs unaffected by these life-limiting factors.
Issue Date: 15-Sep-2022
Date of Acceptance: 30-Aug-2022
URI: http://hdl.handle.net/10044/1/99539
DOI: 10.1021/acs.jpclett.2c02236
ISSN: 1948-7185
Publisher: American Chemical Society
Start Page: 8416
End Page: 8421
Journal / Book Title: Journal of Physical Chemistry Letters
Volume: 36
Issue: 13
Copyright Statement: © 2022 The Authors. Published by American Chemical Society. This work is published under a CC BY 4.0 International licence.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/V007661/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Atomic, Molecular & Chemical
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
GRAIN-BOUNDARY SEGREGATION
HIGH-CAPACITY
SILICON
LITHIATION
PHOSPHORUS
ELECTRODES
STABILITY
CHEMISTRY
02 Physical Sciences
03 Chemical Sciences
Publication Status: Published
Conference Place: United States
Open Access location: https://pubs.acs.org/doi/full/10.1021/acs.jpclett.2c02236
Online Publication Date: 2022-09-01
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering



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