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Title: Elucidation of Separator Effect on Energy Density of Li-Ion Batteries

Abstract

Fast charging of batteries is the key to increase the adoption of electric vehicles. All the components of a battery: anode, cathode, electrolyte and separator, contribute to the limiting factors of fast charging. While majority efforts are focused on novel electrode architecture and electrolyte formulation for high rate capabilities, studies on separators are mostly pertaining to their mechanical and physical properties and little attention has been paid to their effect on rate performance. In this study, we report a comprehensive analysis of the physical properties, electrochemical performance and high rate capabilities of the widely used battery separator Celgard 2325 and Celgard 2500. It is demonstrated that the Celgard 2500 has better electrolyte wettability and ~2 × in electrolyte uptake, and 2.23 Ω/cm2 less in resistance. Consequently, 57% and 47% improvement in capacity is obtained when charged at 2C and 3C, respectively. This indicates that separator can also play an important role in enabling fast charging for lithium-ion batteries.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Yuan Ze Univ., Taoyuan (Taiwan)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office
OSTI Identifier:
1607082
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 166; Journal Issue: 14; Journal ID: ISSN 0013-4651
Publisher:
IOP Publishing - The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Parikh, Dhrupad, Christensen, Tommiejean, Hsieh, Chien-Te, and Li, Jianlin. Elucidation of Separator Effect on Energy Density of Li-Ion Batteries. United States: N. p., 2019. Web. https://doi.org/10.1149/2.0571914jes.
Parikh, Dhrupad, Christensen, Tommiejean, Hsieh, Chien-Te, & Li, Jianlin. Elucidation of Separator Effect on Energy Density of Li-Ion Batteries. United States. https://doi.org/10.1149/2.0571914jes
Parikh, Dhrupad, Christensen, Tommiejean, Hsieh, Chien-Te, and Li, Jianlin. Fri . "Elucidation of Separator Effect on Energy Density of Li-Ion Batteries". United States. https://doi.org/10.1149/2.0571914jes. https://www.osti.gov/servlets/purl/1607082.
@article{osti_1607082,
title = {Elucidation of Separator Effect on Energy Density of Li-Ion Batteries},
author = {Parikh, Dhrupad and Christensen, Tommiejean and Hsieh, Chien-Te and Li, Jianlin},
abstractNote = {Fast charging of batteries is the key to increase the adoption of electric vehicles. All the components of a battery: anode, cathode, electrolyte and separator, contribute to the limiting factors of fast charging. While majority efforts are focused on novel electrode architecture and electrolyte formulation for high rate capabilities, studies on separators are mostly pertaining to their mechanical and physical properties and little attention has been paid to their effect on rate performance. In this study, we report a comprehensive analysis of the physical properties, electrochemical performance and high rate capabilities of the widely used battery separator Celgard 2325 and Celgard 2500. It is demonstrated that the Celgard 2500 has better electrolyte wettability and ~2 × in electrolyte uptake, and 2.23 Ω/cm2 less in resistance. Consequently, 57% and 47% improvement in capacity is obtained when charged at 2C and 3C, respectively. This indicates that separator can also play an important role in enabling fast charging for lithium-ion batteries.},
doi = {10.1149/2.0571914jes},
journal = {Journal of the Electrochemical Society},
number = 14,
volume = 166,
place = {United States},
year = {2019},
month = {10}
}

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