Abstract
The most widely used liquid non-aqueous electrolytes for lithium-ion cells used in HEV (hybrid electric vehicle), PHEV (plug-in-hybrid electric vehicle) and EV (electric vehicle) applications consist of LiPF6 dissolved in carbonates (e.g. EC, DMC and DEC). These electrolytes undergo a variety of hydrolysis and thermal aging mechanisms [1]. Ongoing decomposition reactions lead to further impurities inside the lithium-ion cell which are not well-known. The separator is a second critical component in lithium-ion cells, which can be classified into three groups according to structure and composition: microporous polymer membranes, non-woven fabric mats and inorganic composite membranes [2]. In this contribution, the decomposition reaction mechanisms are evaluated under a number of different thermal conditions for various commercial electrolytes from automotive lithium-ion cells. Furthermore, their influences on the ageing behaviour of different separator types are investigated. Details of the experimental procedure, analytical methods (NMR, GC-MS, SEM/EDX) and first results will be presented. Finally, we will give an overview of our mechanistic interpretation.
Published Version
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