Additive, and lithium secondary battery electrolyte and lithium battery which comprise same
Provided are an additive represented by Chemical Formula 1, an electrolyte for a lithium secondary battery including the same, and a lithium secondary battery. The details of Chemical Formula 1 are as set forth in the specification.
1 . An additive represented by Chemical Formula 1:
Wherein, in Chemical Formula 1,
X 1 and X 2 are each independently O or S, and
L 1 and L 2 are each independently O, S, or a substituted or unsubstituted C1 to C10 alkylene group,
R 1 to R 4 are each independently hydrogen, a halogen, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C1 to C10 acyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C3 to C10 cycloalkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C3 to C10 cycloalkynyl group, or a substituted or unsubstituted C6 to C20 aryl group,
Y 1 and Y 2 are each independently a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C1 to C10 acyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C3 to C10 cycloalkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C3 to C10 cycloalkynyl group, or a substituted or unsubstituted C6 to C20 aryl group, and
n and m are each independently one of integers ranging from 1 to 20.
2 . The additive of claim 1 , wherein
L 1 and L 2 are each independently O or S.
3 . The additive of claim 1 , wherein
Y 1 and Y 2 are each independently a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C1 to C10 acyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, or a substituted or unsubstituted C6 to C20 aryl group.
4 . The additive of claim 1 , wherein
Y 1 and Y 2 are each independently a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C1 to C10 acyl group, or a substituted or unsubstituted C6 to C20 aryl group.
5 . The additive of claim 1 , wherein
Y 1 and Y 2 are each independently a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, or a substituted or unsubstituted C1 to C10 acyl group.
6 . The additive of claim 1 , wherein
n and m are each independently one of integers ranging from 1 to 10.
7 . The additive of claim 1 , wherein
Chemical Formula 1 is represented by Chemical Formula 1A:
wherein, in Chemical Formula 1A,
Y 1 , Y 2 , R 1 to R 4 , n, and m are as defined in claim 1 .
8 . An electrolyte for a lithium secondary battery, comprising
a non-aqueous organic solvent,
a lithium salt, and
the additive of claim 1 .
9 . The electrolyte of claim 8 , wherein
the additive is included in an amount of 0.1 wt % to 5.0 wt % based on the total weight of the electrolyte for the lithium secondary battery.
10 . A lithium secondary battery comprising
a positive electrode including a positive electrode active material;
a negative electrode including a negative electrode active material; and
the electrolyte for the lithium secondary battery of claim 8 .
11 . The lithium secondary battery of claim 10 , wherein
the positive electrode active material is represented by Chemical Formula 5:
Li x M 1 y M 2 z M 3 1-y-z O 2 [Chemical Formula 5]
wherein, in Chemical Formula 5,
0.5≤x≤1.8, 0<y≤1, 0≤z≤1, 0≤y+z≤1, and M 1 , M 2 , and M 3 are each independently any one selected from a metal of Ni, Co, Mn, Al, Sr, Mg, or La, and a combination thereof.
12 . The lithium secondary battery of claim 10 , wherein
the positive electrode active material is a lithium composite oxide represented by Chemical Formula 5-1 or Chemical Formula 5-2:
Li x1 Ni y1 Co z1 Al 1-y1-z1 O 2 [Chemical Formula 5-1]
wherein, in Chemical Formula 5-1,
1≤x1≤1.2, 0<y1<1, and 0<z1<1, and
Li x2 Ni y2 CO z2 Mn 1-y2-z2 O 2 [Chemical Formula 5-2]
wherein, in Chemical Formula 5-2,
1≤x2≤1.2, 0<y2<1, and 0<z2<1.