Preparative hydrophilic interaction liquid chromatography of acidic organofluorophosphates formed in lithium ion battery electrolytes.
The expansion of lithium ion battery (LIB) application is accompanied by the growth of battery pack sizes. This progression emphasizes the consideration of electrolyte safety as well as environmental aspects in case of abuse, accident, or recycling. Hexafluorophosphate is one of the most commonly used conducting salt anions in electrolytes. It has great potential to degrade to various acidic and non-acidic organo(fluoro)phosphates with presence of water and during battery cell operation. Consequently, toxicological investigation on these organo(fluoro)phosphates has emerged because they either have structural similarities as chemical warfare agents or play a widespread physiological role as phosphates in the human body. This circumstance underlines the need of isolated examination of these compounds for safety assessment. In this work, we used hydrophilic interaction liquid chromatography for the extraction of acidic organofluorophosphates from thermally aged LIB electrolytes. The developed two-step fractionation method provided high separation selectivity towards acidic head groups, which allowed the separation of undesired matrix and target compounds. These findings facilitate isolated toxicological investigations on organofluorophosphates that are beneficial for environmental and safety research, the battery cell industry, and human safety surveillance in regard to aged LIB electrolytes.
['Henschel|Jonas|J|', 'Wiemers-Meyer|Simon|S|', 'Diehl|Marcel|M|', 'Lürenbaum|Constantin|C|', 'Jiang|Wen|W|', 'Winter|Martin|M|', 'Nowak|Sascha|S|']
D002853:Chromatography, Liquid D011211:Electric Power Supplies D004573:Electrolytes D006801:Humans D057927:Hydrophobic and Hydrophilic Interactions D007477:Ions D008094:Lithium D063066:Organofluorophosphonates D014867:Water
Hydrophilic interaction liquid chromatography Organofluorophosphates Lithium ion battery Electrolyte decomposition products Preparative HPLC