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Role of 1,3-Propane Sultone

Number of visits: Date:2017-12-22 16:51:30

 Lithium-ion coin cells containing electrolytes with and without 1,3-
propane sultone (PS) and vinylene carbonate (VC) were prepared and investigated.
The electrochemical performance of the cells is correlated with ex situ surface analysis
of the electrodes conducted by Fourier transform infrared and X-ray photoelectron
spectroscopies and in situ gas analysis by online electrochemical mass spectrometry
(OEMS). The results suggest that incorporation of both PS and VC results in
improved capacity retention upon cycling at 55 °C and lower impedance. Ex situ
surface analysis and OEMS confirm that incorporation of PS and VC alter the
reduction reactions on the anode inhibiting ethylene generation and changing the
structure of the solid electrolyte interface. Incorporation of VC results in CO 2
evolution, formation of poly(VC), and inhibition of ethylene generation. Incorporation
of PS results in generation of lithium alkylsulfonate (RSO 2 Li) and inhibition of
ethylene generation. The combination of PS and VC reduces the ethylene gassing
during formation by more than 60%.

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