Abstract: Provided are a sacrificial positive electrode material with a reduced gas generation amount and a method of preparing the same. The sacrificial positive electrode material includes a lithium cobalt zinc oxide represented by Chemical Formula 1 (LixCo(1-y)ZnyO4) and the sacrificial positive electrode material has a powder electrical conductivity of 1×10?4 S/cm to 1×10?2 S/cm. The sacrificial positive electrode material can reduce the generation of gas, particularly, oxygen (O2) gas, during charging and discharging of a battery after activation and achieve a high charge/discharge capacity by including a lithium cobalt metal oxide represented by Chemical Formula 1 (LixCo(1-y)ZnyO4), which is doped with a specific fraction of zinc, and by having a powder electrical conductivity adjusted within a specific range, and thus the stability and lifespan of a battery including the same are effectively enhanced.

Abstract: Provided are a positive electrode for a lithium secondary battery and a lithium secondary battery containing the same. The positive electrode includes a positive electrode current collector and a positive electrode mixture layer disposed thereon and includes a positive electrode active material, a positive electrode additive represented by Formula 1 (LipCo(1-q)M1qO4), a conductive material, and a binder. Furthermore, Equation 1 (RLCZO/R0) is 1.55 or less, wherein RLCO represents an electrode sheet resistance when the positive electrode additive represented by Formula 1 is contained in the positive electrode mixture layer, and R0 represents an electrode sheet resistance when the positive electrode additive represented by Formula 1 is not contained in the positive electrode mixture layer. The positive electrode is manufactured using a pre-dispersion containing the positive electrode additive in a positive electrode mixture layer as an irreversible additive.

Abstract: A positive electrode material powder including a lithium nickel-based oxide represented by Chemical Formula 1 (LiaNibCocM1dM2eO2) and having a degree of single-particle formation, represented by the following Equation (1), of 0.3 to 0.8: ? i = 1 n 4 ? ? 3 ? R i 3 n × 1 D 50 . In Equation (1), Ri is a radius of the ith grain as measured by subjecting an electrode manufactured using the positive electrode material powder to ion milling and then analyzing the cross section of the electrode by electron backscatter diffraction (EBSD), n is the total number of grains as measured by the EBSD analysis and ranges from 350 to 450, and D50 is a volume-cumulative average particle diameter of the positive electrode material powder as measured using a laser diffraction particle size analyzer.

Abstract: A positive electrode active material is disclosed herein. In some embodiments, a positive electrode active material includes a lithium composite transition metal oxide in the form of at least one of single particles or pseudo-single particles, wherein each single particle consists of one nodule, and each pseudo-single particle is a composite of 30 or fewer nodules, wherein the lithium composite transition metal oxide includes Ni, Co, Mn, and Al, wherein a molar ratio of the number of moles of Ni to the total number of moles of all metal elements except lithium is 0.83 to less than 1, a molar ratio of the number of moles of Co to the number of moles of Mn is 0.5 to less than 1, and a molar ratio ratio of the number of moles of Co to the number of moles of Al is 5 to 15.

Abstract: A disclosure sacrificial positive electrode material with reduced gas generation and a method of preparing the same are disclosed herein. In some embodiments, a method includes calcining a mixture of lithium oxide (Li2O) and cobalt oxide (CoO) in an atmosphere containing an inert gas and oxygen gas and having a relative humidity of 20% or less, wherein the oxygen gas is at a partial pressure of 1% or less, to prepare a lithium cobalt metal oxide represented by Chemical Formula (1): LixCo(1-y)MyO4-zAz??[Chemical Formula 1] M is at least one selected from the group consisting of Ti, Al, Zn, Zr, Mn and Ni, A is a halogen, x, y and z are 5?x?7, 0?y?0.4, and 0?z?0.001. A battery having the sacrificial positive electrode material can have reduced gas generation in the electrode assembly at the time of charging the battery, and thus the stability and life of the battery are improved.

Abstract: The present disclosure relates to a positive electrode material which includes a first positive electrode active material and a second positive electrode active material, wherein the second positive electrode active material has an electrical conductivity of 0.1 ?S/cm to 150 ?S/cm, which is measured after the second positive electrode active material is prepared in the form of a pellet by compressing the second positive electrode active material at a rolling load of 400 kgf to 2,000 kgf, a method of preparing the positive electrode material, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode material.

Abstract: A sacrificial positive electrode material, a positive electrode comprising the same, and a lithium secondary battery having the positive electrode are disclosed herein. In some embodiments, a sacrificial positive electrode material includes a lithium cobalt oxide represented by the following Chemical Formula 1, wherein the sacrificial positive electrode active material has a defect formation energy of metal (M) of ?4.0 to ?8.5 eV, calculated using density functional theory (DFT): LixCo(1-y)MyO4 ??[Chemical Formula 1] M is at least one selected from the group consisting of Al, Fe, Zn, Ti, W, Mg, Ge and Si, pa x and y are 5?x?7 and 0.05?y?0.6. When the defect formation energy of the metal is controlled within a specific range, a high initial charging/discharging efficiency is realized during initial charging/discharging, and the amount of gas additionally generated at the later time of charging/discharging is reduced. Thus, stability and the charging/discharging performance of a battery is improved.

Abstract: A positive electrode active material powder for a lithium secondary battery, which includes a lithium composite transition metal oxide in the form of a single particle consisting of one nodule, or a pseudo-single crystal, which is a composite of 30 or less nodules, where the positive electrode active material powder satisfies Expression 1: 0.5?Dmean33 dpress/D50?3.Where Dmean is an average particle diameter of the nodules as measured using an electron backscatter diffraction (EBSD) pattern analyzer, dpress is a press density measured after 5 g of the positive electrode active material powder is input into a circular mold with a diameter of 2 cm and pressurized at a pressure of 2000 kgf, and D50 is a value corresponding to a cumulative volume of 50% in the particle size distribution of the positive electrode active material powder.

Abstract: A positive electrode active material and a method for producing the same are disclosed herein. In some embodiments, a positive electrode active material includes a lithium-nickel-based oxide in the form of at least one of single particles or a pseudo-single particles, wherein each single particle consists of one nodule, wherein each pseudo-primary particles is a composite of 30 or fewer nodules, wherein on the surface of the lithium-nickel-based oxide, a number of nickel ions having an oxidation number of +3 or higher is greater than a number of nickel ions having an oxidation number less than +3.

Abstract: A positive electrode active material, a method for producing the same, and a positive electrode and a lithium secondary battery in including the same are disclosed herein. In some embodiments, a method of producing a positive electrode active material includes mixing a lithium transition metal oxide and a carbon-based material having a hollow structure to form a mixture, and mechanically treating the mixture to form a carbon coating layer on the surface of the lithium transition metal oxide, wherein the carbon-based material has a chain shape, and has a specific surface area of 500 m2/g or greater, a graphitization degree (ID/IG) of 1.0 or higher, and a dibutylphthalate (DBP) absorption of 300 mL/100 g or greater.

Abstract: A positive electrode active material contains a lithium-rich lithium manganese-based oxide, wherein the lithium manganese-based oxide has a composition of the following chemical formula (1), and wherein a lithium ion conductive glass-ceramic solid electrolyte layer containing at least one selected from the group consisting of thio-LISICON(thio-lithium super ionic conductor), LISICON(lithium super ionic conductor), Li2S—SiS2—Li4SiO4, and Li2S—SiS2—P2S5—Lil is formed on the surface of the lithium manganese-based oxide particle: Li1?xMyMn1?x?yO2?zQz??(1) wherein, 0<x?0.2, 0<y?0.2, and 0?z?0.5; M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Ga, In, Ru, Zn, Zr, Nb, Sn, Mo, Sr, Sb, W, Ti and Bi; and Q is at least one element selected from the group consisting of P, N, F, S and Cl.

Abstract: Exemplary embodiments of positive electrode active materials in the form of single particles, and a method of preparing each of them, are provided. The single particles of the exemplary embodiments include single particles of a nickel-based lithium composite metal oxide, having a plurality of crystal grains, each having a size of 180 nm to 300 nm, as analyzed by a Cu K? X-ray (X-r?). The single particles include a metal doped in the crystal lattice thereof. One embodiment includes a surface coating. The total content of the metal doped in the crystal lattice thereof and the metal of the metal oxide coated on the surface thereof is controlled in the range of 2500 ppm to 6000 ppm.

Abstract: Provided is a method of preparing an irreversible positive electrode additive for a secondary battery, which includes mixing Li2O, NiO, and NH4VO3 and performing thermal treatment to prepare a lithium nickel composite oxide represented by Chemical Formula 1 below, wherein the NH4VO3 is mixed in an amount of 1.5 to 6.5 parts by weight with respect to a total of 100 parts by weight of the Li2O, NiO, and NH4VO3. Li2+aNi1?b?cM1bVcO2?dAd??[Chemical Formula 1] In Chemical Formula 1, M1 is at least one selected from the group consisting of Cu, Mg, Pt, Al, Co, P, W, Zr, Nb, and B, A is at least one selected from the group consisting of F, S, Cl, and Br, and 0?a?0.2, 0?b?0.5, 0.01?c?0.065, and 0?d?0.2 are satisfied.

Abstract: The present invention relates to a positive electrode active material for a lithium secondary battery which includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein a portion of nickel (Ni) sites of the lithium composite transition metal oxide is substituted with tungsten (W), and an amount of a lithium tungsten oxide remaining on surfaces of lithium composite transition metal oxide particles is 1,000 ppm or less.

Abstract: A positive electrode active material for a secondary battery includes a first positive electrode active material and a second positive electrode active material, wherein an average particle diameter (D50) of the first positive electrode active material is twice or more than an average particle diameter (D50) of the second positive electrode active material, and the second positive electrode active material has a crystallite size of 200 nm or more.

Abstract: A method for producing a positive electrode active material includes preparing a lithium transition metal oxide in the form of a secondary particle in which primary particles are aggregated, mixing the lithium transition metal oxide and a carbon-based material of a hollow structure having a plurality of pores to form a mixture, and surface treating the mixture in a mechanical manner to form a carbon coating layer on the surface of the lithium transition metal oxide, wherein the carbon-based material of a hollow structure having a plurality of pores has a specific surface area of 200 m2/g or greater and a graphitization degree(ID/IG) of 0.5 or greater.

Abstract: An electrode includes an electrode active material layer, wherein the electrode active material layer includes an electrode active material and a conductive agent, wherein the conductive agent includes graphene, and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other, and the carbon nanotube structure is included in an amount of 0.01 wt % to 0.5 wt % in the electrode active material layer. A secondary battery including the same is also provided.

Abstract: The present disclosure relates to a positive electrode material which includes a first positive electrode active material, and a second positive electrode active material in the form of a single particle, wherein an amount of lithium impurities on a surface of the second positive electrode active material is 0.14 wt % or less based on a total weight of the second positive electrode active material, and at least one of nickel, cobalt, and manganese included in the second positive electrode active material has a concentration gradient gradually changing from the center of the particle to a surface thereof, a method of preparing the positive electrode material, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode material.

Abstract: A positive electrode active material for a lithium secondary battery is provided having a secondary particle formed by agglomerating a plurality of polycrystalline primary particles including a lithium composite metal oxide of Chemical Formula 1, wherein an average crystallite size of the primary particle is 180 to 400 nm, a particle size D50 of the primary particle is 1.5 to 3?m, and the primary particle is doped or surface-coated with at least one element M selected from the group consisting Al, Ti, Mg, Zr, Y, Sr, and B in an amount of 3,800 to 7,000 ppm: Lia(NixMnyCozAw)O2+b ??[Chemical Formula 1].

Abstract: A conductive agent includes a first particle and a second particle, wherein the first particle includes a secondary particle structure in which graphene sheets are connected to each other, the first particle includes a plurality of graphene sheets arranged in different directions, and the second particle is a carbon nanotube. An electrode including the conductive agent, and a secondary battery including the electrode are also provided.