ac0c02086_si_001.pdf (1.44 MB)
Operando Tracking of Solution-Phase Concentration Profiles in Li-Ion Battery Positive Electrodes Using X‑ray Fluorescence
journal contribution
posted on 2020-07-29, 14:10 authored by Jeremy
I. G. Dawkins, Mohammadreza Z. Ghavidel, Danny Chhin, Isabelle Beaulieu, Md Sazzad Hossain, Renfei Feng, Janine Mauzeroll, Steen B. SchougaardThe
trade-off between energy density and power capabilities is
a challenge for Li-ion battery design as it highly depends on the
complex porous structures that holds the liquid electrolyte. Specifically,
mass-transport limitations lead to large concentration gradients in
the solution-phase and subsequently to crippling overpotentials. The
direct study of these solution-phase concentration profiles in Li-ion
battery positive electrodes has been elusive, in part because they
are shielded by an opaque and paramagnetic matrix. Herein we present
a new methodology employing synchrotron hard X-ray fluorescence to
observe the concentration gradient formation within Li-ion battery
electrodes in operando. This methodology is substantiated
with data collected on a model LiFePO4/Li cell using a
1 M LiAsF6 in 1:1 ethylene carbonate/dimethyl carbonate
(EC/DMC) electrolyte under galvanostatic and intermittent charge profiles.
As such, the technique holds great promise for optimization of new
composite electrodes and for numerical model validation.
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Keywords
charge profilesconcentration gradientsmass-transport limitationsLi-Ion Batterycarbonatemodel validationenergy density1 M LiAsF 6Solution-Phase Concentration ProfilesOperando TrackingECelectrolytepower capabilitiesLi-ion battery designLi-ion batteryLi-ion battery electrodesmethodologyconcentration gradient formationX-ray fluorescencesolution-phase concentration profiles
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