Patent ID: 8546023
Filing Date: 2013-10-01
Classification: H01M,Y02E,Y02T

Abstract:
1. A secondary battery comprising a cathode, an anode, a separator, and an electrolyte, wherein the electrolyte comprises a ternary eutectic mixture containing a carbonate based compound and a eutectic mixture containing an amide group-containing compound and an ionizable lithium salt, and the carbonate-based compound is included in an amount of from 0.001 parts to 50 parts by weight based on 100 parts by weight of the electrolyte, wherein the carbonate-based compound is at least one kind of material selected from the group including propylene carbonate(PC), ethylene carbonate(EC), diethyl carbonate(DEC), dimethyl carbonate(DMC), dipropyl carbonate(DPC), butylene carbonate, methylpropyl carbonate, ethylpropyl carbonate, and ethylmethyl carbonate(EMC), and wherein the eutectic mixture containing the amide group-containing compound and the lithium salt is represented by the following Formula 1 or Formula 2, wherein each of R X is selected from the group consisting of hydrogen, carbon, silicon, oxygen, nitrogen, phosphor and sulfur, with the proviso that where X is hydrogen, m=0, where X is oxygen or sulfur, m=1, where X is nitrogen or phosphor, m=2, and where X is carbon or silicon, m=3, each R being independent from the others; and Y is an anion capable of forming a salt with a lithium ion; or wherein each of R X is selected from the group consisting of hydrogen, carbon, silicon, oxygen, nitrogen, phosphor and sulfur, with the proviso that where X is hydrogen, m=0 and n=0, where X is oxygen or sulfur, m=0, where X is nitrogen or phosphor, m=1, and where X is carbon or silicon, m=2, each R being independent from the others; n is an integer of 0˜10, with the proviso that where n is equal to or greater than 1, X is selected from carbon, silicon, oxygen, nitrogen, phosphor and sulfur, except hydrogen; and Y is an anion capable of forming a salt with a lithium ion.