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In the interest of expanding the available options for safe and inexpensive electrolyte in lithium ion batteries, we examined a novel electrolyte consisting of 30% IL (triethylmethylammonium bis(trifluoromethylsulfonyl)imide, N1222-TFSI) mixed with 70% commercial carbonate electrolyte (EC/DMC = 1:1 by wt%, 0.78 mol kg -1 LiPF6) to form a hybrid electrolyte. The hybrid electrolyte failed to ignite after exposure to flame, a demonstration of high thermal stability. The aluminum corrosion is inhibited in N1222-TFSI mixed carbonate electrolyte, while the N-methyl-N-propylpyrrolidinium TFSI mixed carbonate electrolyte experienced serious pitting corrosion. The electrolyte has been observed with the LiFePO4 as positive electrode and the mesophase graphite as negative electrode in 18650 full cells. The electrochemical properties of hybrid electrolyte for the LiFePO4 electrode at 25 o C and 60 o C showed improved performance at high temperature in comparison to commercial electrolyte EC/DMC (1:1 by wt%) 0.78 mol kg -1 LiPF6. Vinylene carbonate (VC) as electrolyte additive in hybrid electrolyte at 2% addition was found to enhance the cycling performance at 25 o C and 60 o C, however a decrease in cell performance was observed at -10 o C.

Mixture of Ionic Liquid and Organic Carbonate as an Electrolyte for LiFePO Battery