Effect of isotropic and anisotropic porous microstructure on electrochemical performance of Li ion battery cathodes: An experimental and computational study
Abstract
Liquid electrolyte mass transport is a major limitation affecting high-power Li ion batteries. Fast discharging causes Li salt depletion in the current collector region of the cathode which produces overpotential in the electrolyte and consequently a drop of cell voltage to below the cut-off voltage, especially at higher electrode thickness and discharge rate. In this study, through experiment and simulation, we have investigated the effect of electrode thickness, mass loading, discharge rate and tortuosity on electrolyte mass transport and final derived areal capacity and specific energy for electrodes having isotropic (normal tape casting) and anisotropic (freeze tape casting) porous microstructure. Furthermore, the macroporous channels in freeze tape cast electrodes facilitate Li salt transport and reduce the Li salt mass transport limitations even at high electrode thickness and discharge rates, and high electrode tortuosity. In our results, computer simulations show that freeze tape cast electrodes may be fully discharged up to 750 μm thickness at 1 C rate compared to 300 μm for normal tape cast electrodes with the same mass loading. Freeze tape cast electrodes also show stable maximum areal capacity for C rates about double the maximum C rates of their normal tape cast electrode counterparts with the samemore »
- Authors:
-
- Clemson Univ., SC (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF)
- OSTI Identifier:
- 1648956
- Grant/Contract Number:
- AC05-00OR22725; OIA-1655740
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Power Sources
- Additional Journal Information:
- Journal Volume: 474; Journal Issue: 1; Journal ID: ISSN 0378-7753
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Thick electrodes; engineered battery electrode; Li icon battery simulation; areal capacity optimization
Citation Formats
Azami-Ghadkolai, Milad, Yousefi, Mehrdad, Allu, Srikanth, Creager, Stephen, and Bordia, Rajendra. Effect of isotropic and anisotropic porous microstructure on electrochemical performance of Li ion battery cathodes: An experimental and computational study. United States: N. p., 2020.
Web. doi:10.1016/j.jpowsour.2020.228490.
Azami-Ghadkolai, Milad, Yousefi, Mehrdad, Allu, Srikanth, Creager, Stephen, & Bordia, Rajendra. Effect of isotropic and anisotropic porous microstructure on electrochemical performance of Li ion battery cathodes: An experimental and computational study. United States. https://doi.org/10.1016/j.jpowsour.2020.228490
Azami-Ghadkolai, Milad, Yousefi, Mehrdad, Allu, Srikanth, Creager, Stephen, and Bordia, Rajendra. Fri .
"Effect of isotropic and anisotropic porous microstructure on electrochemical performance of Li ion battery cathodes: An experimental and computational study". United States. https://doi.org/10.1016/j.jpowsour.2020.228490. https://www.osti.gov/servlets/purl/1648956.
@article{osti_1648956,
title = {Effect of isotropic and anisotropic porous microstructure on electrochemical performance of Li ion battery cathodes: An experimental and computational study},
author = {Azami-Ghadkolai, Milad and Yousefi, Mehrdad and Allu, Srikanth and Creager, Stephen and Bordia, Rajendra},
abstractNote = {Liquid electrolyte mass transport is a major limitation affecting high-power Li ion batteries. Fast discharging causes Li salt depletion in the current collector region of the cathode which produces overpotential in the electrolyte and consequently a drop of cell voltage to below the cut-off voltage, especially at higher electrode thickness and discharge rate. In this study, through experiment and simulation, we have investigated the effect of electrode thickness, mass loading, discharge rate and tortuosity on electrolyte mass transport and final derived areal capacity and specific energy for electrodes having isotropic (normal tape casting) and anisotropic (freeze tape casting) porous microstructure. Furthermore, the macroporous channels in freeze tape cast electrodes facilitate Li salt transport and reduce the Li salt mass transport limitations even at high electrode thickness and discharge rates, and high electrode tortuosity. In our results, computer simulations show that freeze tape cast electrodes may be fully discharged up to 750 μm thickness at 1 C rate compared to 300 μm for normal tape cast electrodes with the same mass loading. Freeze tape cast electrodes also show stable maximum areal capacity for C rates about double the maximum C rates of their normal tape cast electrode counterparts with the same mass loading.},
doi = {10.1016/j.jpowsour.2020.228490},
journal = {Journal of Power Sources},
number = 1,
volume = 474,
place = {United States},
year = {Fri Jul 31 00:00:00 EDT 2020},
month = {Fri Jul 31 00:00:00 EDT 2020}
}
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