Additive for electrolyte of lithium battery, electrolyte for lithium battery including same, and lithium battery employing same electrolyte

An additive for an electrolyte for a lithium battery, the additive comprising a compound represented by Formula 1:

• [P4O10]x.[B(OSiR1R2R3)3]y Formula 1
• wherein
• R1, R2, and R3 are each independently a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C2-C20 alkenyl group, a substituted or unsubstituted C2-C20 alkynyl group, a substituted or unsubstituted C6-C20 aryl group, a substituted or unsubstituted C6-C20 aryloxy group, a substituted or unsubstituted C7-C20 arylalkyl group, a substituted or unsubstituted C2-C20 heteroaryl group, a substituted or unsubstituted C2-C20 heteroaryloxy group, a substituted or unsubstituted C2-C20 heteroarylalkyl group, a substituted or unsubstituted C4-C20 carbon cyclic group, a substituted or unsubstituted C4-C20 carbon cyclic alkyl group, a substituted or unsubstituted C2-C20 heterocyclic group, a substituted or unsubstituted C2-C20 heterocyclic alkyl group, a cyano group, a hydroxy group, a cyano group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a nitro group, a thiol group, phosphonate, a silyl group, a carboxyl group or a salt thereof, a sulfonyl group, a sulfamoyl group, a sulfonic acid group or a salt thereof, or a phosphoric acid or a salt thereof, and
• a molar ratio of x to y (x/y) is in the range of 0.025 to 2.5.