Analysis of Rate-Limiting Factors in Thick Electrodes for Electric Vehicle Applications
Abstract
Increasing electrode thickness and loading can help Li-ion batteries achieve higher energy densities, but the resulting decay in electrochemical performance at elevated rates remains a significant challenge. In order to design an optimal thick electrode, understanding how performance loss occurs is necessary. While it is known that both ionic and electronic conductivity contribute to rate performance, we observed a stronger correlation between electronic conductivity and electrochemical performance of electrodes at a loading of >25 mg/cm2 under C/3 to 1C, rates most relevant to electric vehicle applications. To illustrate this effect, we explore the mud-cracking phenomenon during electrode fabrication to obtain narrow, vertical channels which reduce electrode tortuosity, and therefore decrease the liquid phase ionic resistance in thick electrodes. Variation in crack densities enables us to systematically investigate the effects of ionic and electronic conductivity on electrochemical performance in electrodes with identical overall porosity and composition. Rate and cycling performances of mud-cracked thick electrodes have stronger correlations with electronic conductivity than ionic conductivity. These findings shed new light on the relative importance of electronic versus ionic conductivities, arguing for the need to further optimize electronic conduction in thick electrodes when they are cycled in conditions relevant to electric vehicle applications.
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- OSTI Identifier:
- 1422415
- Alternate Identifier(s):
- OSTI ID: 1509876
- Grant/Contract Number:
- EE0007764
- Resource Type:
- Published Article
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Name: Journal of the Electrochemical Society Journal Volume: 165 Journal Issue: 3; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; 33 ADVANCED PROPULSION SYSTEMS; electronic conductivity; mud-crack; thick electrode
Citation Formats
Lee, Byoung-Sun, Wu, Zhaohui, Petrova, Victoria, Xing, Xing, Lim, Hee-Dae, Liu, Haodong, and Liu, Ping. Analysis of Rate-Limiting Factors in Thick Electrodes for Electric Vehicle Applications. United States: N. p., 2018.
Web. doi:10.1149/2.0571803jes.
Lee, Byoung-Sun, Wu, Zhaohui, Petrova, Victoria, Xing, Xing, Lim, Hee-Dae, Liu, Haodong, & Liu, Ping. Analysis of Rate-Limiting Factors in Thick Electrodes for Electric Vehicle Applications. United States. https://doi.org/10.1149/2.0571803jes
Lee, Byoung-Sun, Wu, Zhaohui, Petrova, Victoria, Xing, Xing, Lim, Hee-Dae, Liu, Haodong, and Liu, Ping. Thu .
"Analysis of Rate-Limiting Factors in Thick Electrodes for Electric Vehicle Applications". United States. https://doi.org/10.1149/2.0571803jes.
@article{osti_1422415,
title = {Analysis of Rate-Limiting Factors in Thick Electrodes for Electric Vehicle Applications},
author = {Lee, Byoung-Sun and Wu, Zhaohui and Petrova, Victoria and Xing, Xing and Lim, Hee-Dae and Liu, Haodong and Liu, Ping},
abstractNote = {Increasing electrode thickness and loading can help Li-ion batteries achieve higher energy densities, but the resulting decay in electrochemical performance at elevated rates remains a significant challenge. In order to design an optimal thick electrode, understanding how performance loss occurs is necessary. While it is known that both ionic and electronic conductivity contribute to rate performance, we observed a stronger correlation between electronic conductivity and electrochemical performance of electrodes at a loading of >25 mg/cm2 under C/3 to 1C, rates most relevant to electric vehicle applications. To illustrate this effect, we explore the mud-cracking phenomenon during electrode fabrication to obtain narrow, vertical channels which reduce electrode tortuosity, and therefore decrease the liquid phase ionic resistance in thick electrodes. Variation in crack densities enables us to systematically investigate the effects of ionic and electronic conductivity on electrochemical performance in electrodes with identical overall porosity and composition. Rate and cycling performances of mud-cracked thick electrodes have stronger correlations with electronic conductivity than ionic conductivity. These findings shed new light on the relative importance of electronic versus ionic conductivities, arguing for the need to further optimize electronic conduction in thick electrodes when they are cycled in conditions relevant to electric vehicle applications.},
doi = {10.1149/2.0571803jes},
journal = {Journal of the Electrochemical Society},
number = 3,
volume = 165,
place = {United States},
year = {Thu Feb 08 00:00:00 EST 2018},
month = {Thu Feb 08 00:00:00 EST 2018}
}
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https://doi.org/10.1149/2.0571803jes
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Cited by: 64 works
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Figures / Tables:
Figure 1: Schematic diagrams of mud-crack formed electrode (a) and comparison of general and mud-cracked discharge process and expected depth of discharge profiles in a normal electrode (b) and mud-cracked electrode (c).
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