The Cooperative Effect of Vinylene Carbonate and 1,3-Propane Sultone on the Elevated Temperature Performance of Lithium Ion Batteries

Vinylene carbonate (VC) and 1,3-propane sultone (1,3-PS) have been used as the electrolyte additives to improve the high temperature safety of the lithium ion batteries. The electrochemical performance of ethylene carbonate-based binary electrolytes without and with additives on graphite electrode is studied by cyclic voltammetry and electrochemical impedance spectroscopic. The cycle performances of the graphite/LiCoO2 batteries with two additives are measured by battery testing system at 25 °C and 60 °C. The morphology and composition of the solid electrolyte interphase are analyzed by scanning electron microscopy and X-ray Photoelectron Spectroscopy, respectively. In summary, the co-use of VC and 1,3-PS can greatly improve the cycle life and suppress swelling behavior of graphite/LiCoO2 cells at elevated temperature.