Operando Tracking of Solution-Phase Concentration Profiles in Li-Ion Battery Positive Electrodes Using X-ray Fluorescence
| Autor: | sazzad Hossain, Danny Chhin, Renfei Feng, Isabelle Beaulieu, Janine Mauzeroll, Mohammadreza Z Ghavidel, Jeremy I. G. Dawkins, Steen B. Schougaard |
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| Rok vydání: | 2020 |
| Předmět: |
Battery (electricity)
010401 analytical chemistry Analytical chemistry X-ray fluorescence Electrolyte 010402 general chemistry 01 natural sciences Synchrotron 0104 chemical sciences Analytical Chemistry law.invention Ion chemistry.chemical_compound chemistry law Electrode Dimethyl carbonate Ethylene carbonate |
| Zdroj: | Analytical Chemistry. 92:10908-10912 |
| ISSN: | 1520-6882 0003-2700 |
| Popis: | The 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. |
| Databáze: | OpenAIRE |
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