Abstract: Disclosed is a positive electrode material for a lithium secondary battery capable of improving the problems of resistance and lifetime deterioration of the battery by forming a thin and uniform metal oxide on the surface of the lithium nickel cobalt manganese-based positive electrode active material, and a method for preparing the same and a lithium secondary battery comprising the same. The method of preparing the positive electrode material for the lithium secondary battery comprises a method of coating a metal oxide on the surface of a lithium nickel cobalt manganese-based positive electrode active material through a chemical vapor deposition. The method includes placing the lithium nickel cobalt manganese-based positive electrode active material in a deposition apparatus and supplying a metal oxide precursor and a carrier gas, and the lithium nickel cobalt manganese-based positive electrode active material is stirred during deposition.

Abstract: A positive electrode and a secondary battery including the same is disclosed herein. In some embodiments, a positive electrode includes a positive electrode current collector and a positive electrode mixture containing a positive electrode active material disposed thereon, the positive electrode active material includes a lithium transition metal oxide powder represented by chemical formula 1, LiaNixCoyMzO2-wAw??(1) M is at least one selected from the group consisting of Mn, Ti, Mg, Al, Zr, Mn and Ni, A is an oxygen-substituted halogen, and 1.00?a?1.05, 0.1?x?0.8, 0.1?y?0.8, 0.01?z?0.4, and 0?w?0.001, the powder having large particles which are secondary particles having an average particle diameter (D50) of 7 ?m to 17 ?m, and small particles which are single particles having average particle diameter (D50) of 2 ?m to 7 ?m, weight ratio of large particles to small particles is 5:5 to 9:1, and the positive electrode mixture has a porosity of 22% to 35%.

Abstract: A positive electrode for a secondary battery in which a positive electrode mixture including a positive electrode active material is formed on at least one surface of a current collector is provided. The positive electrode includes a lithium by-product so as to satisfy the following Equation 1 based on the total weight of the positive electrode mixture. 4000 A - 2000 ? B ? ( ppm ) [ Equation ? ? 1 ] wherein in the Equation 1, A is the molar content of Ni when the total mole of transition metal contained in the positive electrode active material is 1, and B is the content of lithium by-product, when A is 0.5 or less, the minimum value of B is 6000 ppm. The positive electrode also has a harness at which cracks occur in a measuring rod of 2 pi (Ø) or more.

Abstract: The present disclosure provides a positive electrode active material for a secondary battery, comprising: a lithium nickel-based oxide doped with a doping element (M?), wherein the doping element (M?) is at least one selected from the group consisting of titanium (Ti) and magnesium (Mg), wherein when the doping element (M?) is Ti, the doping content of Ti is 3000 ppm to 5000 ppm based on the total amount of the lithium nickel-based oxide excluding the doping element, wherein when the doping element (M?) is Mg, the doping content of Mg is 500 ppm to 5000 ppm based on the total amount of the lithium nickel-based oxide excluding the doping element, and wherein when the doping element (M?) is Ti and Mg, the total doping content of Ti and Mg is 3500 ppm to 5000 ppm based on the total amount of the lithium nickel oxide excluding the doping elements.

Abstract: The present disclosure relates to a method for preparing a positive electrode additive for a lithium secondary battery having a high irreversible capacity and being capable of preventing gelation and reducing gas generation, and a positive electrode additive prepared thereby. The method for preparing the positive electrode additive includes the steps of: mixing a lithium raw material, a nickel raw material and, optionally, a raw material containing an element M, and then heat-treating the mixture, thereby preparing a predetermined lithium nickel oxide, wherein the lithium raw material includes Li2O and LiOH, and the LiOH is used in an amount of 5 to 10% by weight with respect to the total weight of the lithium raw material.

Abstract: There is disclosed a combined-drive bicycle which can increase a driving speed and the beneficial effects of exercise and simultaneously to give fun to a rider. The combined-drive bicycle includes a handle assembly configured to steer a front wheel, the handle assembly comprising a crank handle to generate a handle motive force and a first gear rotated by the rotation of the crank handle, a pedal assembly configured to transmit the handle motive force and a pedal motive force generated by pedals to a rear wheel selectively or simultaneously, and a motive force transmission part to transmit the handle motive force to the pedal assembly, irrelevant to the steering of the handle assembly.

Abstract: There is disclosed a combined-drive bicycle which can increase a driving speed and the beneficial effects of exercise and simultaneously to give fun to a rider. The combined-drive bicycle includes a handle assembly configured to steer a front wheel, the handle assembly comprising a crank handle to generate a handle motive force and a first gear rotated by the rotation of the crank handle, a pedal assembly configured to transmit the handle motive force and a pedal motive force generated by pedals to a rear wheel selectively or simultaneously, and a motive force transmission part to transmit the handle motive force to the pedal assembly, irrelevant to the steering of the handle assembly.