Electrode having solid electrolyte interface and secondary battery using the same
View Patent ↗Disclosed is an electrode having a solid electrolyte interface (SEI) film partially or totally formed on a surface thereof, the SEI film being formed by electrical reduction of a cyclic diester compound and a sulfinyl group-containing compound. Further, a secondary battery comprising the electrode is disclosed.
1. An electrode having a solid electrolyte interface (SEI) film partially or totally formed on a surface thereof, the SEI film being formed by electrical reduction of a cyclic diester compound and a sulfinyl group-containing compound, wherein the cyclic diester compound is not lactide.
2. The electrode as claimed in claim 1 , wherein the cyclic diester compound is selected from the group consisting of glycolide, methyl glycolide, tetramethyl glycolide, fluoroglycolide and vinyl glycolide.
3. The electrode as claimed in claim 1 , wherein the sulfinyl group-containing compound is selected from the group consisting of sulfone, sulfite, sulfonate and sultone.
4. The electrode as claimed in claim 1 , wherein the sulfinyl group-containing compound is selected from the group consisting of divinyl sulfone, ethylene sulfite, propylene sulfite, diallyl sulfonate, propane sultone, butane sultone and propene sultone.
5. A secondary battery comprising a cathode, an anode and an electrolyte, wherein the electrolyte comprises an electrolyte salt and an electrolyte solvent, the electrolyte further comprising both a cyclic diester compound and a sulfinyl group-containing compound; and/or the cathode or the anode is the electrode having a solid electrolyte interface (SEI) film partially or totally formed on a surface thereof, the SEI film being formed by electrical reduction of a cyclic diester compound and a sulfinyl group-containing compound, wherein the cyclic diester compound is not lactide.
6. The secondary battery as claimed in claim 5 , wherein the cyclic diester compound and the sulfinyl group-containing compound have the difference tolerance of 0 to 0.5V in reduction potentials vs. Li+/Li.
7. The secondary battery as claimed in claim 5 , wherein the cyclic diester compound and the sulfinyl group-containing compound have the difference tolerance of 0 to 0.3V in reduction potentials vs. Li+/Li.
8. The secondary battery as claimed in claim 5 , wherein the cyclic diester compound is represented by the following Formula 1:
wherein each of R 1 ˜R 4 independently represents a hydrogen atom, halogen atom, C1˜C10 alkyl group, C2˜C10 alkenyl group, or a halogen-substituted alkyl or alkenyl group, wherein the cyclic diester compound is not lactide.
9. The secondary battery as claimed in claim 5 , wherein the cyclic diester compound is selected from the group consisting of glycolide, methyl glycolide, tetramethyl glycolide, fluoroglycolide and vinyl glycolide.
10. The secondary battery as claimed in claim 5 , wherein the sulfinyl group-containing compound is selected from the group consisting of sultone, sulfite, sulfonate and sultone.
11. The secondary battery as claimed in claim 5 , wherein the sulfinyl group-containing compound is selected from the group consisting of the compounds represented by the following Formula 2, Formula 3 and Formula 4:
wherein each of R 1 and R 2 independently represents a hydrogen atom, halogen atom, C1˜C10 alkyl group, C2˜C10 alkenyl group, or a halogen-substituted alkyl or alkenyl group.