Abstract: A negative electrode active material and a method for preparing a negative electrode active material, comprising preparing a silicon-based compound including SiOx, wherein 0.5<x<1.3, and forming a crystalline carbon coating layer on the silicon-based compound through a chemical vapor deposition method using an organometallic compound as a source, wherein the organometallic compound is at least any one selected from the group consisting of aluminum acetylacetonate, aluminum ethoxide, aluminum phenoxide, aluminum acetate, aluminum tributoxide, and a combination thereof.

Abstract: Disclosed is a negative electrode active material which includes: secondary particles having a plurality of primary particles which include a silicon oxide composite including i) Si, ii) a silicon oxide represented by SiOx (0<x?2), and iii) a metal silicate containing Si and M, wherein M is at least one of Li and Mg; and a first carbon coating layer disposed partially or totally on the surfaces of the primary particles to interconnect and fix the primary particles; and a second carbon coating layer disposed on the surfaces of the secondary particles, wherein the second carbon coating layer has higher crystallinity as compared to the first carbon coating layer, and the primary particles have an average particle diameter (D50) of 0.1-3.5 ?m. A negative electrode including the negative electrode active material, and a lithium secondary battery including the negative electrode are also disclosed.

Abstract: A negative electrode active material including a core having SiOx (0?x<2), an intermediate layer covering at least a portion of a surface of the core and including at least one of silicon nitride or silicon oxynitride, and a carbon coating layer covering at least a portion of the intermediate layer and containing nitrogen.

Abstract: Disclosed is a negative electrode active material which includes: a silicon oxide composite including i) Si, ii) a silicon oxide represented by SiOx (0<x?2), and iii) magnesium silicate containing Si and Mg; and a carbon coating layer positioned on the surface of the silicon oxide composite and including a carbonaceous material, wherein X-ray diffractometry of the negative electrode active material shows peaks of Mg2SiO4 and MgSiO3 at the same time and shows no peak of MgO; and the ratio of peak intensity, I (Mg2SiO4)/I (MgSiO3), which is intensity I (Mg2SiO4) of peaks that belong to Mg2SiO4 to intensity I (MgSiO3) of peaks that belong to MgSiO3 is smaller than 1, the peaks that belong to Mg2SiO4 are observed at 2?=32.2±0.2°, and the peaks that belong to MgSiO3 are observed at 2?=30.9±0.2°.

Abstract: A negative electrode active material for a lithium secondary battery, which includes a silicon-based particle represented by M-SiOx, wherein M is Li, Mg, Ca, Al, or Ti, and 0?x<2, wherein the M-SiOx includes an amorphous phase at 20 wt % to 70 wt % based upon a total weight of the M-SiOx, thereby exhibiting excellent initial efficiency and lifespan characteristics, and a preparation method thereof.

Abstract: A negative electrode active material including a core containing SiOx (0?x<2) and a lithium-containing compound, and a shell disposed on the core and containing SiOx (0?x<2) and magnesium silicate.

Abstract: The present invention relates to a silicon-based particle-polymer composite, which includes silicon-based particles; and a polymer coating layer formed on the silicon-based particles, in which the polymer coating layer includes metal-substituted poly(acrylic acid) in which hydrogen atoms in carboxyl groups of the poly(acrylic acid) chain are substituted with one or more selected from the group consisting of K, Na and Li.

Abstract: The present invention relates to a negative electrode active material including a spherical carbon-based particle, and a carbon layer disposed on the spherical carbon-based particle and including a nano-particle, wherein the nano-particle has a silicon core, an oxide layer disposed on the silicon core and including SiOx (0<x?2), and a coating layer covering at least a portion of the surface of the oxide layer and including LiF.

Abstract: Disclosed is a negative electrode for a lithium secondary battery which includes: a negative electrode current collector; a first negative electrode mixture layer positioned on at least one surface of the negative electrode current collector and including a first negative electrode active material, a polymer binder and a conductive material; and a second negative electrode mixture layer positioned on the top surface of the first negative electrode mixture layer and including a second negative electrode active material, a polymer binder and a conductive material, wherein the second negative electrode active material has a smaller water contact angle as compared to the first negative electrode active material, and at least one of the first negative electrode active material and the second negative electrode active material is surface-modified.

Abstract: A negative electrode active material which includes a core including SiOx (0<x<2), a shell disposed on the core and includes lithium silicate, and a coating layer disposed on the shell and includes carbon nanotubes. Also, a method of preparing a negative electrode active material as well as a negative electrode and a battery including the same.

Abstract: The present invention relates to a silicon-based active material-polymer composite which is secondary particles in which silicon-based particles as primary particles and conductive polymer particles having a modulus of elasticity of 10 Pa to 100 Pa at a temperature of 20° C. to 40° C. are uniformly mixed. The uniform mixture with the elastic conductive polymer particles provides for a buffering action against the stress generated by volumetric changes of the silicon-based particles.

Abstract: The present invention relates to a negative electrode active material including a carbonaceous matrix having a plurality of nano-particles, wherein the nano-particles have a silicon core, an oxide layer disposed on the silicon core and including SiOx (0<x?2), and a coating layer covering at least a portion of the surface of the oxide layer and including LiF.

Abstract: A silicon-carbon complex comprising carbon-based particles and silicon-based particles, wherein the silicon-based particles are dispersed and positioned on surfaces of the carbon-based particles, the carbon-based particles have a specific surface area of 0.4 m2/g to 1.5 m2/g, and the silicon-based particles are doped with one or more elements selected from the group consisting of Mg, Li, Ca, and Al, and a negative electrode active material for lithium secondary battery comprising the same.

Abstract: The present invention relates to a method of preparing a negative electrode active material which includes forming a mixture by mixing Li2O and SiOx(0<x<2) particles including SiO2, forming a reaction product by performing a heat treatment on the mixture at 400° C. to 600° C., and removing a portion of lithium silicate in the reaction product by washing the reaction product.

Abstract: A method of preparing a lithium metal oxide having a nickel oxide layer formed on a surface thereof includes (1) complexing a nickel precursor onto a surface of a lithium metal oxide; and (2) calcining, through a heat treatment, the lithium metal oxide—the surface of which is complexed with the nickel precursor—obtained in step (1).

Abstract: A negative electrode for a lithium secondary battery (and a lithium secondary battery including the same) including: a negative electrode current collector; a first negative electrode mixture layer present on at least one surface of the negative electrode current collector and including a first carbonaceous negative electrode active material, a first polymer binder and a first conductive material; a second negative electrode mixture layer present on a top surface of the first negative electrode mixture layer and including a silicon-based negative electrode active material, a second polymer binder and a second conductive material; and a third negative electrode mixture layer present on a top surface of the second negative electrode mixture layer and including a second carbonaceous negative electrode active material, a third polymer binder and a third conductive material.

Abstract: A negative electrode active material which includes a secondary particle including first primary particles, wherein the first primary particle includes a core including SiOx, wherein 0?x<2, an intermediate layer which covers at least a portion of a surface of the core and includes silicon nitride, silicon oxynitride, or a mixture thereof, and a carbon coating layer which covers at least a portion of the intermediate layer and includes nitrogen-doped carbon, and a negative electrode and a lithium secondary battery which include the same.

Abstract: Provided are a negative electrode active material for a lithium secondary battery and a method of preparing the same, wherein since the negative electrode active material includes porous polycrystalline silicon and the porous polycrystalline silicon includes pores disposed at grain boundaries, the negative electrode active material may exhibit a buffering action by internally absorbing changes in volume of the active material during charge and discharge. As a result, lifetime characteristics of a negative electrode and a battery may be improved.

Abstract: The present invention relates to a method for manufacturing a conductor, and a lithium secondary battery including a conductor manufactured using the manufacturing method, and the method for manufacturing a conductor includes removing metal impurities in a conductor by irradiating microwave on the conductor including the metal impurities and converting the metal impurities into metal oxides. A conductor manufactured using the manufacturing method converts metal impurities included in the conductor to metal oxides that are inactive at a battery operating voltage and not eluted in an electrolyte liquid, and therefore, is capable of enhancing battery performance properties, particularly, capacity and lifespan properties without concern of metal impurity elution and a defect occurrence under a low pressure caused therefrom.

Abstract: A negative electrode active material including silicon-based active material particles each including a core including SiOx, wherein 0?x?2, and a coating layer present on the core. Also, a negative electrode active material in which the coating layer is any one of a carbon coating layer or a polymer coating layer, and the coating layer includes a fluorinated material including at least one of an alkali metal or an alkaline earth metal.