title: Identification of alkylated phosphates by gas chromatography-mass spectrometric investigations with different ionization principles of a thermally aged commercial lithium ion battery electrolyte.
abstract: The thermal aging process of a commercial LiPF6 based lithium ion battery electrolyte has been investigated in view of the formation of volatile phosphorus-containing degradation products. Aging products were analyzed by GC-MS. Structure determination of the products was performed by support of chemical ionization MS in positive and negative modes. A fraction of the discovered compounds belongs to the group of fluorophosphates (phosphorofluoridates) which are in suspect of potential toxicity. This is well known for relative derivatives, e.g. diisopropyl fluorophosphate. Another fraction of the identified compounds belongs to the group of trialkyl phosphates. These compounds may provide a positive impact on the thermal and electrochemical performance of Li-based batteries as repeatedly described in the literature.
authors.affiliation: University of Münster, MEET Battery Research Center, Institute of Physical Chemistry, Corrensstraße 46, 48149 Münster, Germany.
authors.forename: Waldemar
authors.initials: W
authors.lastname: Weber
authors.affiliation: University of Münster, MEET Battery Research Center, Institute of Physical Chemistry, Corrensstraße 46, 48149 Münster, Germany.
authors.forename: Vadim
authors.initials: V
authors.lastname: Kraft
authors.affiliation: University of Münster, MEET Battery Research Center, Institute of Physical Chemistry, Corrensstraße 46, 48149 Münster, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Grützke
authors.affiliation: University of Münster, MEET Battery Research Center, Institute of Physical Chemistry, Corrensstraße 46, 48149 Münster, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Wagner
authors.affiliation: University of Münster, MEET Battery Research Center, Institute of Physical Chemistry, Corrensstraße 46, 48149 Münster, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Winter
authors.affiliation: University of Münster, MEET Battery Research Center, Institute of Physical Chemistry, Corrensstraße 46, 48149 Münster, Germany. Electronic address: sascha.nowak@uni-muenster.de.
authors.forename: Sascha
authors.initials: S
authors.lastname: Nowak
mesh_terms: D002414:Cations, Monovalent; D011211:Electric Power Supplies; D004573:Electrolytes / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D008094:Lithium / Q000737:chemistry*; D010755:Organophosphates / Q000032:analysis*
chemical_list: D002414:Cations, Monovalent; D004573:Electrolytes; D010755:Organophosphates; D008094:Lithium
keywords: Aging; Electrolyte; GC–MS; LiPF(6)-based batteries; Organophosphates