NON-AQUEOUS ELECTROLYTE AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME
A non-aqueous electrolyte and a lithium secondary battery including the same are provided. The non-aqueous electrolyte includes a non-aqueous organic solvent, a lithium salt, an additive represented by Chemical Formula 1 or Chemical Formula 2, and an auxiliary additive including a carbonate-based compound. A content of the additive relative to a weight of the carbonate-based compound is in a range from 10 wt % to 50 wt %. Capacity properties at low temperature and lifespan properties at high temperature may be improved.
1 . A non-aqueous electrolyte, comprising:
a non-aqueous organic solvent;
a lithium salt;
an additive represented by Chemical Formula 1 or Chemical Formula 2; and
an auxiliary additive comprising a carbonate-based compound,
wherein a content of the additive relative to a weight of the carbonate-based compound is in a range from 10 wt % to 50 wt %:
wherein, in Chemical Formulae 1 and 2, R 1 to R 4 are each independently a hydrocarbon containing a substituted or unsubstituted C 1 -C 6 alkyl group, or a substituted or unsubstituted C 6 -C 12 aryl group, and A 1 to A 3 are each independently hydrogen or a hydroxyl group.
2 . The non-aqueous electrolyte according to claim 1 , wherein the additive is represented by Chemical Formula 3:
wherein, in Chemical Formula 3, A 1 to A 5 are each independently hydrogen or a hydroxyl group.
3 . The non-aqueous electrolyte according to claim 1 , wherein the additive is represented by Chemical Formula 4:
wherein, in Chemical Formula 4, R 4 is a hydrocarbon containing a substituted or unsubstituted C 1 -C 6 alkyl group, or a substituted or unsubstituted C 6 -C 12 aryl group.
4 . The non-aqueous electrolyte according to claim 1 , wherein the auxiliary additive further comprises a sultone-based compound including an alkyl sultone-based compound and an alkenyl sultone-based compound.
5 . The non-aqueous electrolyte solution according to claim 4 , wherein a content of the additive relative to a weight of the alkyl sultone-based compound is in a range from 20 wt % to 100 wt %.
6 . The non-aqueous electrolyte according to claim 4 , wherein a content of the additive relative to a weight of the alkenyl sultone-based compound is in a range from 20 wt % to 170 wt %.
7 . The non-aqueous electrolyte according to claim 1 , wherein a content of the additive relative to a total weight of the non-aqueous electrolyte is in a range from 0.1 wt % to 0.5 wt %.
8 . The non-aqueous electrolyte according to claim 1 , wherein the non-aqueous organic solvent includes at least one of ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) and diethyl carbonate (DEC).
9 . The non-aqueous electrolyte according to claim 1 , wherein the lithium salt includes at least one of lithium tetrafluoroborate (LiBF 4 ), lithium hexafluorophosphate (LiPF 6 ) and lithium difluorophosphate (LiPO 2 F 2 ).
10 . A lithium secondary battery, comprising:
a cathode;
an anode facing the cathode; and
the non-aqueous electrolyte of claim 1 .