In-operando FT-IR spectroscopy of electrolyte decomposition in lithium-ion batteries
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One 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.