Capacity Fade and Its Mitigation in Li-Ion Cells with Silicon-Graphite Electrodes

Bareno, Javier; Shkrob, Ilya A.; Gilbert, James A.; Klett, Matilda; Abraham, Daniel P.

doi:10.1021/acs.jpcc.7b06118

Title: Capacity Fade and Its Mitigation in Li-Ion Cells with Silicon-Graphite Electrodes

Journal Article · 06 September 2017 · Journal of Physical Chemistry. C

DOI: https://doi.org/10.1021/acs.jpcc.7b06118 · OSTI ID:1405319

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^[1]; Gilbert, James A. ^[1]; Klett, Matilda ^[2];

^[1]

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)

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 SiO_xF_y 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1405319

Journal Information:: Journal of Physical Chemistry. C, Vol. 121, Issue 38; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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