Journal article
Pore-Scale Transport Resolved Model Incorporating Cathode Microstructure and Peroxide Growth in Lithium-Air Batteries
Journal of the Electrochemical Society, v 162(7), pp A1135-A1145
01 Jan 2015
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The electrode microstructure plays an integral role in the performance of the non-aqueous Li-air battery. Computational modeling has proven to be an indispensible tool in the analysis of battery systems, but previous macroscale, volume-averaged models that consider the porous electrode as a homogenous medium of uniform geometric properties are insufficient to probe the effect of precise electrode microstructures. Utilizing a pore-scale transport-resolved model of the Li-air battery, the complex electrode and Li2O2 morphologies can be directly incorporated and their effects on the system-level performance can be evaluated. A thickness-dependent electrical conductivity of Li2O2 is considered in the model based on inputs from the density functional theory. Model validation is presented along with a sensitivity study of the applied current density and the reaction rate coefficient. The effect of electrode geometry (e.g., nanostructure spacing and height) on cell performance, including its influence on pore blocking compared against electrical insulation, is investigated. Pore blocking is observed for cathodes with nanostructure spacing less than twice a critical insulating thickness of Li2O2, suggesting the loss of active surface area as the mechanism for decreased cell performance. While for cathodes with larger nanostructure spacing, the discharge capacity is dictated by the electrical insulation of Li2O2. (C) The Author(s) 2015. Published by ECS. All rights reserved.
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Details
- Title
- Pore-Scale Transport Resolved Model Incorporating Cathode Microstructure and Peroxide Growth in Lithium-Air Batteries
- Creators
- Charles P. Andersen - Drexel UniversityHan Hu - Drexel UniversityGang Qiu - Drexel UniversityVibha Kalra - Drexel UniversityYing Sun - Drexel University
- Publication Details
- Journal of the Electrochemical Society, v 162(7), pp A1135-A1145
- Publisher
- Electrochemical Soc Inc
- Number of pages
- 11
- Grant note
- TG-CTS110056 / Extreme Science and Engineering Discovery Environment (XSEDE) CBET-1318341 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000355643700002
- Scopus ID
- 2-s2.0-84929454638
- Other Identifier
- 991019167322504721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Electrochemistry
- Materials Science, Coatings & Films