HF Formation in LiPF6-Based Organic Carbonate Electrolytes

HF concentration and generation rate in organic LiPF6-based carbonate electrolytes at 60°C was studied. Various compositions of linear and cyclic carbonates were used to determine the electrolyte degradation mechanism. Diethyl carbonate (DEC) has been identified as a promoter of HF formation, yieldi...

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Bibliographic Details
Published in:ECS electrochemistry letters 2013-01, Vol.2 (12), p.A121-A123
Main Authors: Lux, Simon Franz, Chevalier, Julie, Lucas, Ivan T., Kostecki, Robert
Format: Article
Language:English
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Summary:HF concentration and generation rate in organic LiPF6-based carbonate electrolytes at 60°C was studied. Various compositions of linear and cyclic carbonates were used to determine the electrolyte degradation mechanism. Diethyl carbonate (DEC) has been identified as a promoter of HF formation, yielding 1 mmol/L of HF in 1 mol/L LiPF6 DEC after 200 hours at 60°C. Prolonged aging of 1 mol/L LiPF6, EC:DEC electrolyte at room temperature results in a significantly lower HF formation rate with time. Spiking the aged electrolyte with 500 ppm of water restores the HF formation rate to a level typical for a freshly prepared electrolyte.
ISSN:2162-8726
2162-8734
DOI:10.1149/2.005312eel