Electrolyte containing siloxane compound and lithium secondary battery including the electrolyte

An electrolyte comprising:

• a lithium salt;
• an organic solvent;
• and
• at least one siloxane compound represented by Formula 1 or Formula 2,
• wherein an amount of the at least one siloxane compound is 0.05 weight percent to 20 weight percent, based on a total weight of the electrolyte
• wherein, in Formulae 1 and 2,
• X1 is hydrogen, a hydroxyl group, or a substituted or unsubstituted C1-C10 alkyl group,
• Y1 is hydrogen or —Si(R3)(R4)(R5),
• n1 is an integer from 1 to 1000,
• n2 is an integer from 1 to 5, and
• R1 to R13 are each independently hydrogen, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C6-C20 aryl group, or a polyalkylene oxide group represented by *—R31—O—(RO)m2—R32, wherein R31 is a substituted or unsubstituted C1-C10 alkylene group, and * represents a point of attachment to Si, RO is an alkylene oxide group, m2 is an integer from 1 to 20, and R32 is hydrogen or a substituted or unsubstituted C1-C10 alkyl group,
• wherein, in Formula 1, X1 is a hydroxyl group or Y1 is hydrogen, and
• in Formula 2, at least one of R6 to R13 is the polyalkylene oxide group.