Vinyl ethylene sulfite as a new additive in propylene carbonate-based electrolyte for lithium ion batteries

Abstract

Vinyl ethylene sulfite (VES) is studied as a new additive in propylene carbonate (PC)-based electrolyte for lithium ion batteries. The electrochemical results show that the artificial graphite material exhibits excellent electrochemical performance in a PC-based electrolyte with the addition of the proper amount of VES. According to our spectroscopic results, VES is reduced to ROSO₂Li (R=C₄H₆), Li₂SO₃ and butadiene (C₄H₆) through an electrochemical process which precedes the decomposition of PC. Furthermore, some of the Li₂SO₃ could be further reduced to Li₂S and Li₂O. All of these products are proven to be components of the solid electrolyte interface (SEI) layer.