Abstract: A center floor structure for a vehicle, includes: a center floor panel having an opening, and a peripheral portion of the center floor panel defining the opening; and a battery assembly mounted under the center floor panel, and covering the opening of the center floor panel. The opening is defined in a central portion of the center floor panel, and the peripheral portion includes a plate structure.

Abstract: A floor structure for a vehicle includes: a center floor panel; a plurality of seat crossmembers extending in a width direction of a vehicle; a rail member disposed to be orthogonal to the plurality of seat crossmembers; a pair of side sills disposed on both sides of the center floor panel; and a pair of battery mounting beams coupled to the pair of side sills, respectively, wherein each battery mounting beam is coupled to an inboard sidewall of each side sill, and cylindrical nuts for mounting a battery assembly are individually disposed on the battery mounting beams and the seat crossmembers.

Abstract: A center floor structure for a vehicle, includes: a center floor panel having an opening, and a peripheral portion of the center floor panel defining the opening; and a battery assembly mounted under the center floor panel, and covering the opening of the center floor panel. The opening is defined in a central portion of the center floor panel, and the peripheral portion includes a plate structure.

Abstract: A center floor structure for a vehicle, includes: a center floor panel having an opening, and a peripheral portion of the center floor panel defining the opening; and a battery assembly mounted under the center floor panel, and covering the opening of the center floor panel. The opening is defined in a central portion of the center floor panel, and the peripheral portion includes a plate structure.

Abstract: A floor structure for a vehicle includes: a center floor panel; a plurality of seat crossmembers extending in a width direction of a vehicle; a rail member disposed to be orthogonal to the plurality of seat crossmembers; a pair of side sills disposed on both sides of the center floor panel; and a pair of battery mounting beams coupled to the pair of side sills, respectively, wherein each battery mounting beam is coupled to an inboard sidewall of each side sill, and cylindrical nuts for mounting a battery assembly are individually disposed on the battery mounting beams and the seat crossmembers.

Abstract: Provided are a cathode active material for a lithium secondary battery, a method of fabricating the same, and a lithium secondary battery including the same. The cathode active material includes a lithium composite transition metal oxide represented by Li1+(c-a)/2NiaCobMncO2-xFx (0.1?c?a?0.4, 0.13?a?0.3, 0.03?b?0.2, 0.4?c?0.6, (a+b+c)+(1+(c?a)/2)=2, 0<x?0.15, 1?a/b?6, 1.9?c/a?4.0, and 0.04?b/(a+b+c)?0.25), and layer-structured Li2MnO3. Since the lithium secondary battery including the cathode active material has a large capacity and generates less gas, lifespan characteristics and high rate capability are significantly improved, and especially voltage variation during charging and discharging operations is small.

Abstract: A lithium metal oxide composite for a lithium secondary battery includes a core portion formed of a Mn metal compound and a shell portion formed of a three-component system metal compound at an outside of the core portion. A method of preparing a lithium metal oxide composite for a lithium secondary battery includes: mixing an Mn metal salt aqueous solution, a chelate agent, and a pH regulator to precipitate a first precursor; thermally treating the obtained first precursor; mixing the thermally treated first precursor with a three component system metal salt aqueous solution, a chelate agent, and a pH regulator to precipitate a second precursor; and mixing the obtained second precursor with a lithium-containing compound to synthesize a powder via a firing.

Abstract: Provided are a cathode active material for a lithium secondary battery, a method of fabricating the same, and a lithium secondary battery including the same. The cathode active material includes a lithium composite transition metal oxide represented by Li1+(c?a)/2NiaCobMncO2-xFx (0.1?c?a?0.4, 0.13?a?0.3, 0.03?b?0.2, 0.4?c?0.6, (a+b+c)+(1+(c?a)/2)=2, 0<x?0.15, 1?a/b?6, 1.9?c/a?4.0, and 0.04?b/(a+b+c)?0.25), and layer-structured Li2MnO3. Since the lithium secondary battery including the cathode active material has a large capacity and generates less gas, lifespan characteristics and high rate capability are significantly improved, and especially voltage variation during charging and discharging operations is small.

Abstract: A lithium metal oxide composite for a lithium secondary battery includes a core portion formed of a Mn metal compound and a shell portion formed of a three-component system metal compound at an outside of the core portion. A method of preparing a lithium metal oxide composite for a lithium secondary battery includes: mixing an Mn metal salt aqueous solution, a chelate agent, and a pH regulator to precipitate a first precursor; thermally treating the obtained first precursor; mixing the thermally treated first precursor with a three component system metal salt aqueous solution, a chelate agent, and a pH regulator to precipitate a second precursor; and mixing the obtained second precursor with a lithium-containing compound to synthesize a powder via a firing.

Abstract: Provided are a positive active material including a spinel lithium manganese oxide surface-coated with one or more types of nanoparticles selected from olivine-type lithium metal phosphate and metal oxide, a method of preparing the same and a lithium secondary battery using the same. The positive active material provides a lithium secondary battery having improved high-temperature cycle life characteristic and capacity per weight.