Non-aqueous electrolyte additive, and non-aqueous electrolyte for lithium secondary battery comprising the same and lithium secondary battery
AssigneeLG Chem, Ltd.
InventorsSung Hoon Yu, Kyung Mi Lee
Life of this patent
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Abstract
The present invention relates to a non-aqueous electrolyte additive, and a non-aqueous electrolyte for a lithium secondary battery including the same and a lithium secondary battery, and particularly, to a non-aqueous electrolyte additive having a nitrile group and a propargyl group, and a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery, which include the non-aqueous electrolyte additive so that capacity and cycle lifespan characteristics at high temperature can be improved.
Claims9
A non-aqueous electrolyte additive comprising at least one compound selected from the group consisting of compounds represented by Formula I and Formula II below:
- wherein R1 is a C1 to C5 linear or nonlinear alkylene group substituted or unsubstituted with at least one nitrile group, or a C6 to C8 aromatic group substituted or unsubstituted with at least one nitrile group,
- R2 is a C1 to C5 linear or nonlinear alkylene group substituted or unsubstituted with at least one nitrile group, a C6 to C8 aromatic group substituted or unsubstituted with at least one nitrile group, a C6 to C8 heteroaromatic group substituted or unsubstituted with at least one nitrile group, a C2 to C5 linear or nonlinear alkenyl group, or —C(O)—R9—, wherein R9 is a C1 to C3 linear or nonlinear alkylene group substituted with at least one nitrile group,
- R3 is hydrogen or a C1 to C5 linear or nonlinear unsubstituted alkyl group when m is 0, and a C1 to C5 linear or nonlinear alkylene group when m is 1,
- R4 is a C1 to C3 alkylene group or —R10—C(O)—, wherein R10 is a C1 to C3 alkylene group, and n and m each independently are an integer of 0 or 1,
- wherein R5 is hydrogen or a C1 to C5 linear or nonlinear alkyl group substituted or unsubstituted with at least one nitrile group,
- wherein R6 is a C1 to C5 linear or nonlinear alkylene group, and
- wherein R7 to R8 each independently are a C1, C3, C4, or C5 linear or nonlinear alkylene group.
A non-aqueous electrolyte for a lithium secondary battery comprising:
- an ionizable lithium salt;
- an organic solvent;
- and
- a non-aqueous electrolyte additive,
- wherein the non-aqueous electrolyte additive includes at least one compound selected from the group consisting of compounds represented by Formula I and Formula II below:
- wherein R1 is a C1 to C5 linear or nonlinear alkylene group substituted or unsubstituted with at least one nitrile group, or a C6 to C8 aromatic group substituted or unsubstituted with at least one nitrile group,
- R2 is a C1 to C5 linear or nonlinear alkylene group substituted or unsubstituted with at least one nitrile group, a C6 to C8 aromatic group substituted or unsubstituted with at least one nitrile group, a C6 to C8 heteroaromatic group substituted or unsubstituted with at least one nitrile group, a C2 to C5 linear or nonlinear alkenyl group, or —C(O)—R9—, wherein R9 is a C1 to C3 linear or nonlinear alkylene group substituted with at least one nitrile group,
- R3 is hydrogen or a C1 to C5 linear or nonlinear unsubstituted alkyl group when m is 0, and a C1 to C5 linear or nonlinear alkylene group when m is 1,
- R4 is a C1 to C3 alkylene group or —R10—C(O)—, wherein R10 is a C1 to C3 alkylene group, and
- n and m each independently are an integer of 0 or 1,
- wherein R5 is hydrogen or a C1 to C5 linear or nonlinear alkyl group substituted or unsubstituted with at least one nitrile group,
- wherein R6 is a C1 to C5 linear or nonlinear alkylene group, and
- wherein R7 to R8 each independently are a C1, C3, C4, or C5 linear or nonlinear alkylene group.
Dependencies are inferred from the claim text.