Abstract: The present invention relates to an electrolyte additive including a compound represented by Chemical Formula 1, an electrolyte including the electrolyte additive, and a secondary battery including the electrolyte. Chemical Formula 1: R1 and R2 are each independently an alkylene group having 1-5 carbon atoms; E1 is a bond, an alkylene group having 1-3 carbon atoms, or a cyclic carbonyl group, ether group, or ester group having 2-5 carbon atoms; R3 is a substituted or unsubstituted linear or cyclic carbonate group, carbonyl group, ether group, phosphate group, sulfonate group, or sulfate group having 2-5 carbon atoms; the substitution refers to substitution with one or more selected from F, Cl, Br, and I or an alkenyl group having 1-3 carbon atoms; E2 is a bond or a saturated or unsaturated alkylene group or ether group having 1-3 carbon atoms; and n is 0 or 1.

Abstract: The present invention relates to an electrolyte additive including a compound containing a substituent represented by Chemical Formula 1, an electrolyte including the electrolyte additive, and a secondary battery including the electrolyte. Chemical Formula 1: In Chemical Formula 1, P and O are phosphorus and oxygen, respectively; A is a bond or oxygen; Q is oxygen or an unshared electron pair; R1, R2, R3, and R4 are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, an alkenyl group, an alkynyl group, an alkoxy group, an alkoxycarbonyl group, an alkoxyalkyl group, a fluoroalkyl, or a cyclic sulfate; optionally, R1 or R2 is connected to R3 or R4 to form a double bond or a ring; n is an integer from 0 to 3; and * is a binding position.

Abstract: The present invention relates to an electrolyte additive, a battery electrolyte including the electrolyte additive, and a secondary battery, and more particularly, to an electrolyte additive including a compound represented by Chemical Formula 1, an electrolyte including the electrolyte additive, and a secondary battery including the electrolyte. According to the present invention, due to low charging resistance, charging efficiency and output may be improved. In addition, the present invention has an effect of providing a secondary battery having a long lifespan and excellent capacity retention at high temperature.

Abstract: The present invention provides an electrolyte additive comprising a salt of an anion, derived from a nitrogen-atom-containing compound, with Cs+ or Rb+. Further, the present invention provides an electrolyte additive further comprising lithium difluoro bis(oxalato) phosphate. The present invention provides a non-aqueous electrolyte comprising a lithium salt, a non-aqueous organic solvent, and the electrolyte additive, and may provide a lithium secondary battery comprising: a cathode employing a cathode active material; an anode employing an anode active material; a separator interposed between the cathode and the anode; and the non-aqueous electrolyte.

Abstract: The present invention relates to an electrolyte additive comprising a salt of an anion with K+ or Na+, the anion being derived from a nitrogen atom-containing compound, and a lithium-containing compound for forming a coating film. In addition, the present invention provides a lithium salt, a non-aqueous organic solvent, and the electrolyte additive. The present invention relates to a lithium secondary battery which includes a cathode employing a cathode active material, an anode employing an anode active material, a separator interposed between the cathode and the anode, and the non-aqueous electrolyte.

Abstract: The present invention provides an electrolyte additive comprising a salt of an anion, derived from a nitrogen-atom-containing compound, with Cs+ or Rb+. Further, the present invention provides an electrolyte additive further comprising lithium difluoro bis(oxalato) phosphate. The present invention provides a non-aqueous electrolyte comprising a lithium salt, a non-aqueous organic solvent, and the electrolyte additive, and may provide a lithium secondary battery comprising: a cathode employing a cathode active material; an anode employing an anode active material; a separator interposed between the cathode and the anode; and the non-aqueous electrolyte.

Abstract: The present invention may provide an electrolyte additive comprising a lithium compound for film formation and a salt of an anion, derived from a nitrogen-atom-containing compound, with Cs+ or Rb+. The present invention also provides a non-aqueous electrolyte comprising a lithium salt, a non-aqueous organic solvent, and the electrolyte additive, wherein the electrolyte additive may further comprise lithium difluoro bis oxalato phosphate, and may provide a lithium secondary battery comprising: a cathode employing a cathode active material; an anode employing an anode active material; a separator interposed between the cathode and the anode; and the non-aqueous electrolyte. A secondary battery comprising the electrolyte additive according to the present invention may have improved high-temperature output characteristics.

Abstract: The present invention relates to an electrolyte additive comprising a salt of an anion with K+ or Na+, the anion being derived from a nitrogen atom-containing compound, and a lithium difluoro bis(oxalato)phosphate. In addition, the present invention provides a lithium salt, a non-aqueous organic solvent, and the electrolyte additive. The present invention relates to a lithium secondary battery which includes a cathode employing a cathode active material, an anode employing an anode active material, a separator interposed between the cathode and the anode, and the non-aqueous electrolyte.

Abstract: The present invention relates to an electrolyte additive comprising a salt of an anion with K+ or Na+, the anion being derived from a nitrogen atom-containing compound, and a lithium-containing compound for forming a coating film. In addition, the present invention provides a lithium salt, a non-aqueous organic solvent, and the electrolyte additive. The present invention relates to a lithium secondary battery which includes a cathode employing a cathode active material, an anode employing an anode active material, a separator interposed between the cathode and the anode, and the non-aqueous electrolyte.

Abstract: The present invention relates to an electrolyte for a lithium secondary battery and a lithium secondary battery including the same, wherein the electrolyte comprises an organic solvent and an electrolyte additive, represented by chemical formula 1 and mixed lithium salts in the organic solvent so that room and high temperature life-time properties of the battery can be improved. Said chemical 1 is defined in the specification.

Abstract: Provided are an electrolyte additive represented by the following formula (1), an electrolyte solution containing the electrolyte additive, and a lithium secondary battery including the electrolyte solution: The electrolyte solution containing the electrolyte additive can enhance the normal-temperature and high-temperature lifetime characteristics of the battery to be equivalent or superior to the characteristics of conventional batteries, and can extend the service life of the battery.