Abstract: Disclosed is a lithium secondary battery having improved lifespan characteristics. More particularly, a lithium secondary battery comprising a cathode, an anode, a separator interposed between the cathode and anode, and an electrolyte, wherein the anode comprises lithium titanium oxide (LTO) as an anode active material, the electrolyte comprises a lithium salt; a non-aqueous-based solvent; and (a) a phosphate compound which can prevent gas generation during high-temperature storage, (b) a sulfonate compound which can reduce discharge resistance by forming a low-resistance SEI layer, or a mixture of the compound (a) and the compound (b), is disclosed.

Abstract: The present invention provides a non-aqueous electrolyte solution for a lithium secondary battery, comprising an ester-based compound having a branched-chain alkyl group; and a lithium secondary battery using the same.

Abstract: Provided are a non-aqueous electrolyte, which includes an organic solvent, a lithium salt, and a phosphorus compound including an acryloyloxy group, and a lithium secondary battery including the non-aqueous electrolyte. Since the non-aqueous electrolyte includes the phosphorus compound to form a stable solid electrolyte interface (SEI) on an electrode during charge and discharge of the battery, initial capacity and power characteristics at room temperature and low temperature as well as lifetime characteristics of the battery may be improved.

Abstract: Provided are a non-aqueous electrolyte, which includes an organic solvent, a lithium salt, and a phosphorus compound including an acryloyloxy group, and a lithium secondary battery including the non-aqueous electrolyte. Since the non-aqueous electrolyte includes the phosphorus compound to form a stable solid electrolyte interface (SEI) on an electrode during charge and discharge of the battery, initial capacity and power characteristics at room temperature and low temperature as well as lifetime characteristics of the battery may be improved.

Abstract: The present invention provides non-aqueous electrolyte solution for a lithium secondary battery, comprising an ester-based compound having a branched-chain alkyl group and an ester-based compound having a straight-chain alkyl group; and a lithium secondary battery using the same.

Abstract: The present disclosure refers to a secondary battery which comprises a high-voltage cathode active material and a separator whose pores are not obstructed even though being used together with the high-voltage cathode active material, thereby preventing the obstruction of pores in the separator and the formation of a dendrite in the anode and eventually providing good battery life performance.

Abstract: The present disclosure relates to a gel polymer electrolyte including an imide salt, and a lithium secondary battery including the same and having a protective film formed on a cathode tab. Disclosed are a gel polymer electrolyte that allows the production of a secondary battery having excellent quality with no corrosion of a cathode, while using, as an electrolyte, an imide-based salt effective for improvement of output quality and high-temperature storability, as well as a secondary battery including the same.

Abstract: The present invention provides a gel polymer electrolyte obtained by polymerizing and gelling a composition for a gel polymer including an organic solvent, an electrolyte salt and a first polymerizable monomer, wherein the gel polymer electrolyte further comprises a compound represented by the following Formula 1 as a first additive: where R1 to R3 are independently hydrogen, an alkyl group having 1 to 5 carbon atoms, an aryl group having 5 to 7 carbon atoms, or a fluorine substituted alkyl group having 1 to 5 carbon atoms, or at least two substituents selected from R1 to R3 are coupled or connected to each other to form a cycle group having a ring atom composed of 2 to 6 carbon atoms or a heterocyclic group having a ring atom composed of 2 to 8 carbon atoms and 1 to 3 oxygen hetero atoms.

Abstract: The present invention relates to a lithium secondary battery including a cathode, an anode, a separator disposed between the cathode and the anode, and a non-aqueous electrolyte. An ionomer is included in at least one element selected from the group consisting of the cathode, the anode, the separator, and the non-aqueous electrolyte.

Abstract: Provided is a non-aqueous electrolyte solution including a non-aqueous organic solvent, an imide-based lithium salt, and at least one additive selected from the group consisting of lithium difluoro bis(oxalato)phosphate (LiDFOP), (trimethylsilyl)propyl phosphate (TMSPa), 1,3-propene sultone (PRS), and ethylene sulfate (ESa), as an electrolyte solution additive. According to the electrolyte solution additive for a lithium secondary battery of the present invention, the electrolyte solution additive may improve output characteristics at high and low temperatures and may prevent a swelling phenomenon by suppressing the decomposition of PF6? on the surface of a cathode, which may occur during a high-temperature cycle of a lithium secondary battery including the electrolyte solution additive, and preventing an oxidation reaction of an electrolyte solution.

Abstract: Provided are a non-aqueous electrolyte including a non-aqueous organic solvent, a lithium salt, and a borate-based compound, and a lithium secondary battery using the same. According to the present invention, a lithium secondary battery having improved cycle characteristics and high-temperature storage stability may be prepared by including a non-aqueous electrolyte which includes at least one borate-based compound as an additive.

Abstract: Disclosed is a lithium secondary battery with improved rate characteristics. More particularly, disclosed is a lithium secondary battery including a cathode, an anode, a separator disposed between the cathode and the anode, and an electrolyte, wherein the electrolyte includes a mixed solvent of a cyclic carbonate-based material and a propionate-based material, the cathode includes a lithium manganese composite oxide represented by Formula 1 below as a cathode active material, and the anode includes a lithium metal oxide represented by Formula 2 below as an anode active material: LixMyMn2-yO4-zAz??(1) wherein 0.9?x?1.2, 0<y<2, and 0?z<0.2; M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti, and Bi; and A is at least one monovalent or divalent anion, LiaM?bO4-cAc??(2) wherein M? is at least one element selected from the group consisting of Ti, Sn, Cu, Pb, Sb, Zn, Fe, In, Al, and Zr; 0.1?a?4 and 0.

Abstract: The present invention may improve the lifetime characteristics of a lithium secondary battery, and particularly, may provide a non-aqueous electrolyte solution or cathode including a phosphate-based compound which may exhibit stable and excellent lifetime characteristics at high temperature and high voltage regardless of the moisture content or the presence of a pressing process of the electrode.

Abstract: The present invention provides a lithium secondary battery and the preparation thereof, more specifically a lithium secondary battery comprising an electrode assembly having a cathode, an anode, and a separator interposed between the cathode and the anode; and a non-aqueous electrolyte solution impregnated in the electrode assembly, wherein the separator further comprises a layer having a plurality of destroyed capsules dispersed therein, the layer being formed on at least one surface of the separator coming into contact with the cathode and the anode, and the destroyed capsules has a film formed from a binder polymer and inorganic particles dispersed therebetween. The lithium secondary battery of the present invention can be prepared without the separate introducing process of a non-aqueous electrolyte solution, and has a separator exhibiting improved mechanical property and safety.

Abstract: The present disclosure relates to an electrolyte for a lithium secondary battery, comprising a non-aqueous solvent, a lithium salt and an additive having a perfluoroalkyl group. By including the additive having a specific structure in the electrolyte, the output of the lithium secondary battery can be improved greatly.

Abstract: Disclosed is a lithium secondary battery. The lithium secondary battery includes a cathode, an anode, a separator and a non-aqueous electrolyte solution. The separator includes a porous substrate, and a coating layer coated on at least one surface of the porous substrate and including a mixture of inorganic particles and a binder polymer. The non-aqueous electrolyte solution contains an ionizable lithium salt, an organic solvent, and a dinitrile compound having a specific structure. The lithium secondary battery is very safe without side reactions of the electrolyte solution. Therefore, the lithium secondary battery exhibits excellent cycle life and output performance characteristics.

Abstract: The present invention provides a lithium secondary battery and the preparation thereof, more specifically a lithium secondary battery comprising an electrode assembly having a cathode, an anode, and a separator interposed between the cathode and the anode; and a non-aqueous electrolyte solution impregnated in the electrode assembly, wherein the separator further comprises a layer having a plurality of destroyed capsules dispersed therein, the layer being formed on at least one surface of the separator coming into contact with the cathode and the anode, and the destroyed capsules has a film formed from a binder polymer and inorganic particles dispersed therebetween. The lithium secondary battery of the present invention can be prepared without the separate introducing process of a non-aqueous electrolyte solution, and has a separator exhibiting improved mechanical property and safety.

Abstract: Disclosed is a lithium secondary battery having improved lifespan characteristics. More particularly, a lithium secondary battery comprising a cathode, an anode, a separator interposed between the cathode and anode, and an electrolyte, wherein the anode comprises lithium titanium oxide (LTO) as an anode active material, the electrolyte comprises a lithium salt; a non-aqueous-based solvent; and (a) a phosphate compound which can prevent gas generation during high-temperature storage, (b) a sulfonate compound which can reduce discharge resistance by forming a low-resistance SEI layer, or a mixture of the compound (a) and the compound (b), is disclosed.

Abstract: The present invention provides non-aqueous electrolyte solution for a lithium secondary battery, comprising an ester-based compound having a branched-chain alkyl group and an ester-based compound having a straight-chain alkyl group; and a lithium secondary battery using the same.

Abstract: Disclosed are an anode for secondary batteries and a secondary battery including the same. The anode includes an anode mixture including an anode active material, coated on a current collector, wherein the anode active material includes lithium titanium oxide (LTO) particles provided on surfaces thereof with a cross-linked polymer coating layer, wherein the LTO particles with the cross-linked polymer coating layer formed thereon retain a porous structure formed therebetween, and a cross-linked polymer of the coating layer is a phosphate-based compound.