Lg Chem, Ltd

Daegoo Electronic Materials Co., Ltd.

Ick Soon Kwak

Seung Beom Cho

Hwa Seok Chae

Yeo June Yoon

Chang Wan Chae

Wook Jang

Sang Soon Choi

Jun Seong Ahn

Dae Gon Han

Hye Ji Jeon

Do Hoon Kim

Tae Hyun Kwon

Won Jae Moon

Kwang Wook Choi

Sung Wook Mhin

Jung Hyun Oh

Hyo Joung Nam

Provided are a manufacturing method of a positive electrode active material for a lithium secondary battery including: a first step of dry-mixing a transition metal hydroxide and an anhydrous lithium raw material; a second step of subjecting the mixture of the transition metal hydroxide and the anhydrous lithium raw material to primarily firing; and a third step of finely pulverizing and mixing the primarily fired material and performing secondary firing, and thus obtaining a lithium transition metal oxide, wherein, in the first step, the anhydrous lithium raw material is mixed at 40 parts by weight or less based on 100 parts by weight of the transition metal hydroxide, and a positive electrode for a lithium secondary battery including a positive electrode active material manufactured by the above-described manufacturing method, and a lithium secondary battery.

Method for preparing positive electrode active material for lithium secondary battery, positive electrode comprising the positive electrode active material prepared by the same and lithium secondary battery

A method of preparing a positive electrode active material is disclosed herein. In some embodiments, the method includes firing a first mixture at 400° C. to 700° C. to prepare a primary firing product, wherein the first mixture has a positive electrode active material precursor having a specific composition, a first lithium-containing source material, and optionally, an aluminum-containing source material, and firing a second mixture at a temperature above the firing temperature of the first mixture to prepare a positive electrode active material, wherein the second mixture has the primary firing product, a second lithium-containing source material, and a specific doping element M-containing source material. The method is capable of degrading the cake strength of a primary firing product and providing a positive electrode active material having excellent quality by dividing a firing process into two steps.

Method of preparing positive electrode active material

The present invention relates to a method of preparing a positive electrode material for a lithium secondary battery including a first step of synthesizing a lithium transition metal oxide represented by Chemical Formula 1, a second step of preparing lithium transition metal oxide powder by grinding the lithium transition metal oxide, a third step of preparing a positive electrode material including an alumina coating layer by mixing as well as dispersing the lithium transition metal oxide powder in an alumina nanosol, and a fourth step of drying the positive electrode material, a positive electrode material for a lithium secondary battery prepared by the above method, and a lithium secondary battery including the positive electrode material,Li(NiMnCo)O&#x2003;&#x2003;[Chemical Formula 1]

Method of preparing positive electrode material for lithium secondary battery, positive electrode material for lithium secondary battery, and lithium secondary battery including the positive electrode material

Provided are polycrystalline lithium manganese oxide particles represented by Chemical Formula 1 and a method of preparing the same:LiMnAlMO&#x2003;&#x2003;&#x3c;Chemical Formula 1&#x3e; According to an embodiment of the present invention, limitations, such as the Jahn-Teller distortion and the dissolution of Mn, may be addressed by structurally stabilizing the polycrystalline lithium manganese oxide particles. Thus, life characteristics and charge and discharge capacity characteristics of a secondary battery may be improved.

Polycrystalline lithium manganese oxide particles, preparation method thereof, and cathode active material including the same

The present invention provides a positive electrode active material which includes a lithium transition metal oxide particle, composite particles, and at least one kind of conductive oxide particle on the lithium transition metal oxide particle surface, and also provides a preparation method for the positive electrode active material. The positive electrode active material includes lithium transition metal oxide particles and particular conductive oxide particles and composite particles which have a single phase, and thus the positive electrode active material not only has superb electronic conductivity, while having excellent ion transfer capability which allows transfer of metal ions such as lithium ions to lithium transition metal oxide particles, but may also minimize capacity reduction and output reduction in a secondary battery.

Positive electrode active material and preparation method thereof

Provided is a cathode active material including lithium transition metal oxide particles and composite particles, wherein the composite particles include any one selected from the group consisting of yttria stabilized zirconia (YSZ), gadolinia-doped ceria (GDC), lanthanum strontium gallate magnesite (LSGM), lanthanum strontium manganite (LSM), and nickel (Ni)&#x2014;YSZ, or a mixture of two or more thereof, and the cathode active material includes the composite particles having a single-phase peak when analyzed by X-ray diffraction (XRD). A cathode active material according to an embodiment of the present invention may not only minimize the reduction in capacity or output of a secondary battery, but may also further improve life characteristics.

Cathode active material, preparation method thereof, and lithium secondary battery comprising the same

Provided are a cathode active material including polycrystalline lithium manganese oxide and a sodium-containing coating layer on a surface of the polycrystalline lithium manganese oxide, and a method preparing the same. Since the cathode active material according to an embodiment of the present invention may prevent direct contact between the polycrystalline lithium manganese oxide and an electrolyte solution by including the sodium-containing coating layer on the surface of the polycrystalline lithium manganese oxide, the cathode active material may prevent side reactions between the cathode active material and the electrolyte solution. In addition, since limitations, such as the Jahn-Teller distortion and the dissolution of Mn, may be addressed by structurally stabilizing the polycrystalline lithium manganese oxide, tap density, life characteristics, and charge and discharge capacity characteristics of a secondary battery may be improved.

Cathode active material and method of preparing the same

Provided are a cathode active material including polycrystalline lithium manganese oxide and a boron-containing coating layer on a surface of the polycrystalline lithium manganese oxide, and a method preparing the same. Since the cathode active material according to an embodiment of the present invention may prevent direct contact between the polycrystalline lithium manganese oxide and an electrolyte solution by including the boron-containing coating layer on the surface of the polycrystalline lithium manganese oxide, the cathode active material may prevent side reactions between the cathode active material and the electrolyte solution. In addition, since limitations, such as the Jahn-Teller distortion and the dissolution of Mn, may be addressed by structurally stabilizing the polycrystalline lithium manganese oxide, tap density, life characteristics, and charge and discharge capacity characteristics of a secondary battery may be improved.

Provided are polycrystalline lithium manganese oxide particles represented by Chemical Formula 1 and a method of preparing the same:LiMnAlMO&#x2003;&#x2003;&#x3c;Chemical Formula 1&#x3e;

The present invention relates to a surface coated positive electrode active material, a preparation method thereof, and a lithium secondary battery including the same. More specifically, it relates to a positive electrode active material of which surface is coated with a nanofilm including polyimide (PI) and conductive nanoparticles, a preparation method thereof, and a lithium secondary battery including the same. The positive electrode active material of which surface is coated with the nanofilm according to the present invention is capable of preventing direct contact of the positive electrode active material with an electrolyte thereby suppressing a side reaction between the positive electrode active material and the electrolyte, and as a result, a lifespan property of a lithium secondary battery using a positive electrode including the same may be significantly improved, and particularly, a lifespan property and conductivity are capable of being enhanced under a high temperature and high voltage condition.

Surface coated positive electrode active material, preparation method thereof and lithium secondary battery including the same

An apparatus for collecting soluble component-removed powder that collects soluble component-removed and poorly soluble component-containing powder to recycle by removing the soluble component from the powder through filtering using a vacuum pump after mixing soluble component-removed and poorly soluble component-containing powder and a solvent dissolving the soluble component, and a method of the same.

Gathering method and apparatus of powder separated soluble component

Disclosed herein is a lamp including a specific phosphor and having good ability to maintain brightness and color coordinates. Particularly, this invention provides a lamp using a phosphor in which a magnetoplumbite phase is epitaxially formed on the surface of a phosphor having a &#x3b2; alumina phase.

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Daejeon, South Korea

Ick Soon Kwak