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

Shelton, Austin
; 
Saqib, Najmus
; 
Porter, Jason M.
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2017-07
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2017 NSF Research Experiences for Undergraduates posters and presentations
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AustinShelton_2017CSM_REMRSECREU_Poster.pdf
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https://hdl.handle.net/11124/171229
 http://dx.doi.org/10.25676/11124/171229
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Abstract
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.
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