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

Parikh, Dhrupad; Christensen, Tommiejean; Hsieh, Chien-Te; Li, Jianlin

doi:10.1149/2.0571914jes

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

Journal Article · 03 October 2019 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/2.0571914jes · OSTI ID:1607082

Parikh, Dhrupad ^[1]; Christensen, Tommiejean ^[2];

^[3];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Yuan Ze Univ., Taoyuan (Taiwan)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1607082

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 14 Vol. 166; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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