Thermal Decomposition of LiPF[sub 6]-Based Electrolytes for Lithium-Ion Batteries

The thermal decomposition of lithium-ion battery electrolytes 1.0 M LiPF 6 in one or more carbonate solvents has been investigated. Electrolytes containing diethyl carbonate (DEC), ethylene carbonate (EC), a 1:1 mixture of EC/dimethyl carbonate (DMC), and a 1:1:1 mixture EC/DMC/DEC have been investigated by multinuclear nuclear magnetic spectroscopy, gas chromatography with mass selective detection, and size exclusion chromatography. Thermal decomposition affords products including: carbon dioxide (CO 2), ethylene (CH 2CH 2), dialkylethers (R 2O), alkyl fluorides (RF), phosphorus oxyfiuoride (OPF3), fluorophosphates [OPF 2OR, OPF(OR) 2], fluorophosporic acids [OPF 2OH, OPF(OH) 2], and oligoethylene oxides. The…

• UA
  U.S. Air Force
• DO
  Division of Materials Research