Using Vinylene Carbonate as Electrolyte additive in Li-ion Batteries

Electrolytes which have 1 m LiBF4 salt concentration in the ratio of 1:1 (w/w) Ethylene Carbonate (EC): Dimethyl Carbonate (DMC) solvents were prepared. As electrolyte additive Vinylene Carbonate (1 %) was added to prepared electrolyte solution. Free-standing SnO2/Graphene (G) nanocomposite anode materials were fabricated by using SnO2 nanopowders synthesized and graphene oxide synthesized via Hummers’ method. Obtained electrolytes and anode materials were used to assemble CR2016 Li-ion button cells. After electrochemical tests with 100 charge-discharge cycles, in order to investigate the effect of VC additive on the stability of anode material the cells were disassembled and the anode materials were taken out and SEM method was applied to SnO2/G nanocomposite anode material. The results indicated that VC forms SEI layer on electrode material and provides capacity retention in Li-ion batteries.