Capacity Fade and Its Mitigation in Li-Ion Cells with Silicon-Graphite Electrodes
Abstract
Silicon-graphite (Si-Gr) electrodes typically contain lithiated carboxylates as polymer binders that are introduced through aqueous processing. Li-ion cells with such electrodes show significantly faster capacity fade than cells with graphite (Gr) electrodes. Here we examine the causes for capacity loss in Si-Gr cells containing LiPF6-based electrolytes. The presence of SiOxFy in the Si-Gr electrode, fluorophosphate species in the electrolyte, and silica on the positive electrode indicates the crucial role of the hydrolytic cycle. In particular, HF acid that is generated through LiPF6 hydrolysis corrodes Si particles. As it reacts, the released water re-enters the cycle. We trace the moisture initiating this detrimental cycle to the hydration water in the lithiated binders that cannot be fully removed by thermal treatment. The rate of HF corrosion can be reduced through the use of electrolyte additives. For the fluoroethylene carbonate (FEC) additive, the improved performance arises from changes to the solid electrolyte interphase (SEI) that serves as a barrier against HF attack. Here, we propose that the greater extent of polymer cross-linking, that gives FEC-derived SEI elastomer properties, slows down HF percolation through this SEI membrane and inhibits the formation of deep cracks through which HF can access and degrade the Si surface.
- Authors:
-
- Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Div.
- Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Div.; KTH Royal Institute of Technology, Stockholm (Sweden)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- OSTI Identifier:
- 1405319
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 38; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 25 ENERGY STORAGE; NMR; XPS; electrochemistry; hydrolysis; lithium ion battery; polymer binder; silicon electrode
Citation Formats
Bareno, Javier, Shkrob, Ilya A., Gilbert, James A., Klett, Matilda, and Abraham, Daniel P. Capacity Fade and Its Mitigation in Li-Ion Cells with Silicon-Graphite Electrodes. United States: N. p., 2017.
Web. doi:10.1021/acs.jpcc.7b06118.
Bareno, Javier, Shkrob, Ilya A., Gilbert, James A., Klett, Matilda, & Abraham, Daniel P. Capacity Fade and Its Mitigation in Li-Ion Cells with Silicon-Graphite Electrodes. United States. https://doi.org/10.1021/acs.jpcc.7b06118
Bareno, Javier, Shkrob, Ilya A., Gilbert, James A., Klett, Matilda, and Abraham, Daniel P. Wed .
"Capacity Fade and Its Mitigation in Li-Ion Cells with Silicon-Graphite Electrodes". United States. https://doi.org/10.1021/acs.jpcc.7b06118. https://www.osti.gov/servlets/purl/1405319.
@article{osti_1405319,
title = {Capacity Fade and Its Mitigation in Li-Ion Cells with Silicon-Graphite Electrodes},
author = {Bareno, Javier and Shkrob, Ilya A. and Gilbert, James A. and Klett, Matilda and Abraham, Daniel P.},
abstractNote = {Silicon-graphite (Si-Gr) electrodes typically contain lithiated carboxylates as polymer binders that are introduced through aqueous processing. Li-ion cells with such electrodes show significantly faster capacity fade than cells with graphite (Gr) electrodes. Here we examine the causes for capacity loss in Si-Gr cells containing LiPF6-based electrolytes. The presence of SiOxFy in the Si-Gr electrode, fluorophosphate species in the electrolyte, and silica on the positive electrode indicates the crucial role of the hydrolytic cycle. In particular, HF acid that is generated through LiPF6 hydrolysis corrodes Si particles. As it reacts, the released water re-enters the cycle. We trace the moisture initiating this detrimental cycle to the hydration water in the lithiated binders that cannot be fully removed by thermal treatment. The rate of HF corrosion can be reduced through the use of electrolyte additives. For the fluoroethylene carbonate (FEC) additive, the improved performance arises from changes to the solid electrolyte interphase (SEI) that serves as a barrier against HF attack. Here, we propose that the greater extent of polymer cross-linking, that gives FEC-derived SEI elastomer properties, slows down HF percolation through this SEI membrane and inhibits the formation of deep cracks through which HF can access and degrade the Si surface.},
doi = {10.1021/acs.jpcc.7b06118},
journal = {Journal of Physical Chemistry. C},
number = 38,
volume = 121,
place = {United States},
year = {2017},
month = {9}
}
Web of Science
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