Journal
JOURNAL OF POWER SOURCES
Volume 306, Issue -, Pages 702-710Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.12.047
Keywords
Lithium ion battery; Separator; Automotive; Safety; Mechanical versus electrochemical performance; Impedance
Funding
- Austrian Research Promotion Agency (FFG)
- Technical University of Graz faculty of Mechanical Engineering
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Lithium-ion batteries are in widespread use in electric vehicles and hybrid vehicles. Besides features like energy density, cost, lifetime, and recyclability the safety of a battery system is of prime importance. The separator material impacts all these properties and requires therefore an informed selection. The interplay between the mechanical and electrochemical properties as key selection criteria is investigated. Mechanical properties were investigated using tensile and puncture penetration tests at abuse relevant conditions. To investigate the electrochemical performance in terms of effective conductivity a method based on impedance spectroscopy was introduced. This methodology is applied to evaluate ten commercial separators which allows for a trade-off analysis of mechanical versus electrochemical performance. Based on the results, and in combination with other factors, this offers an effective approach to select suitable separators for automotive applications. (C) 2015 Elsevier B.V. All rights reserved.
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