Non-aqueous electrolyte and secondary battery using the same
AssigneeLG Chem, Ltd.
InventorsHo-Chun Lee, Jeong-Ju Cho
Life of this patent
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Abstract
Disclosed is an electrolyte for a secondary battery comprising an electrolyte salt and an electrolyte solvent, the electrolyte comprising both a lactam-based compound and a sulfinyl group-containing compound. Also, 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 the above compounds. Further, a secondary battery comprising the electrolyte and/or the electrode is disclosed.
Claims10
A secondary battery comprising a cathode, an anode and an electrolyte comprising an electrolyte salt and an electrolyte solvent, the electrolyte comprising both a lactam-based compound and a sulfinyl group-containing compound, wherein the lactam-based compound and the sulfinyl group-containing compound have the difference tolerance of 0 to 0.7V in reduction potentials vs. Li+/Li wherein the lactam-based compound is represented by the following Formula 1:
- wherein n is a number of 3-11, and X is selected from the group consisting of a hydrogen atom, C1-C10 alkyl group, C2-C10 alkenyl group, an electron withdrawing group (EWG)-substituted alkyl or alkenyl group, and an electron withdrawing group(EWG);
- and
- the sulfinyl group-containing compound is selected from the group consisting of sulfone, sulfite, sulfonate and sultone;
- wherein the sulfone is represented by Formula 2;
- the sulfite is represented by Formula 3;
- and the sulfonate is represented by Formula 4
- wherein each of R1 and R2 independently represents a hydrogen atom, halogen atom, C1-C10 alkyl group, C2-C10 alkenyl group, or a halogen-substituted alkyl or alkenyl group.
An electrolyte for a secondary battery comprising an electrolyte salt and an electrolyte solvent, the electrolyte comprising both a lactam-based compound and a sulfinyl group-containing compound, wherein the lactam-based compound and the sulfinyl group-containing compound have the difference tolerance of 0 to 0.7V in reduction potentials vs. Li+/Li, wherein the lactam-based compound is represented by the following Formula 1:
- wherein n is a number of 3-11, and X is selected from the group consisting of a hydrogen atom, C1-C10 alkyl group, C2-C10 alkenyl group, an electron withdrawing group (EWG)-substituted alkyl or alkenyl group, and an electron withdrawing group(EWG);
- and
- the sulfinyl group-containing compound is selected from the group consisting of sulfone, sulfite, sulfonate and sultone;
- wherein the sulfone is represented by Formula 2;
- the sulfite is represented by Formula 3;
- and the sulfonate is represented by Formula 4
- wherein each of R1 and R2 independently represents a hydrogen atom, halogen atom, C1-C10 alkyl group, C2-C10 alkenyl group, or a halogen-substituted alkyl or alkenyl group.
Dependencies are inferred from the claim text.