Shelton, AustinSaqib, NajmusPorter, Jason M.2017-07-272022-02-032017-07-272022-02-03https://hdl.handle.net/11124/171229http://dx.doi.org/10.25676/11124/171229One of the major problems of Li-ion batteries is the decomposition of electrolyte at elevated temperatures. In situ FT-IR spectroscopy can be used to study the health of the electrolyte in Li-ion cells. We used an ATR FT-IR spectro-electrochemical cell to observe thermal decomposition of LiPF6 EC/DEC electrolyte in a LiCoO2 coin cell. Results show that at 70 ℃, several infrared absorption peaks were irreversibly lost. This led to a significant degradation of the electrochemical performance of the battery.postersengCopyright of the original work is retained by the author.Text