Lg Chem, Ltd

Lg Energy Solution, Ltd.

Bo Ram Lee

Wang Mo Jung

Dong Hyun Kim

Chi Ho Jo

Hyuck Hur

Sun Sik Shin

Hye Lim Jeon

Sung Bin Park

Sungbin Park

Young Uk Park

Tae Gon Kim

Byung Chun Park

Sin Young Park

Tae Gu Yoo

Min Kwak

Jiyoung Park

Sang Min Park

Ji Young Park

Younguk Park

Young Cheol Choi

Sangwook Lee

Hong Kyu Park

Ji Hye Kim

Sang Wook Lee

Houng Sik Yoo

Ju Young Lee

Ho Suk Shin

Seul Ki Kim

Bong-Yong Lee

Hyung Man Cho

Nam Ho Kim

Dae Jin Lee

Ki Won Sung

Hyun Jung Lee

Hoe Chul Jung

Je Ho Ryu

Jung A Lee

Hak Yoon Kim

Jungmin Han

Se Hui Sohn

Kwang Woo Yoon

Jae Sun Kim

Byung Joon Chae

Yoon-Jung Lee

Young Ah Shin

Joon Ho Sa

Hyun Joo Son

Jin Young Hwang

Sung Hoon Park

Shin Ae Kim

Seung Yong Son

Mi-Kyung Kim

Hansu Park

Seung Ho Lee

Keun Ho Ryu

Yong Hyuk Kim

Won-No Youn

Hye Young Han

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.

Method for producing positive electrode active material for lithium secondary battery and positive electrode active material for lithium secondary battery produced thereby

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.

Conductive agent, electrode including the conductive agent, and secondary battery including the electrode

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 a first conductive agent and a second conductive agent, wherein the first conductive agent includes a secondary particle in which a plurality of graphene sheets are arranged in different directions and a portion of one graphene sheet is connected to a portion of adjacent another graphene sheet, the second conductive agent includes 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 electrode is also provided.

Electrode and secondary battery including the same

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 m/g or greater, a graphitization degree (I/I) of 1.0 or higher, and a dibutylphthalate (DBP) absorption of 300 mL/100 g or greater.

A negative electrode includes a negative electrode active material layer, wherein the negative electrode active material layer includes a negative electrode active material and a conductive material. The negative electrode active material includes SiO(0≤x<2) particles and the conductive material includes secondary particles in which a portion of one graphene sheet is connected to a portion of an adjacent graphene sheet and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are coupled to each other, wherein the oxygen content of the secondary particles is 1 wt % to 10 wt % based on the total weight of the secondary particles, the specific surface area of the secondary particles measured by a nitrogen adsorption BET method is 500 m/g to 1100 m/g, and the carbon nanotube structure is included in the negative electrode active material layer in an amount of an 0.01 wt % to 1.0 wt %.

Negative electrode and secondary battery including negative electrode

A positive electrode active material particle includes a core that contains lithium cobalt oxide represented by the following Chemical Formula LiCoMOAand a shell that is coated on the surface of the core and contains composite metal oxide of a metal with an oxidation number of +2 and a metal with an oxidation number of +3. In particular, M is at least one selected from the group consisting of Ti, Mg, Zn, Si, Al, Zr, V, Mn, Nb and Ni. A is oxygen-substitutional halogen and 1.00≤a≤1.05, 0≤x≤0.05, and 0≤y≤0.001.

Positive electrode active material particle including core containing lithium cobalt oxide and shell containing composite metal oxide and preparation method thereof

The present invention provides a positive active material for a rechargeable lithium battery, the active material including a dopant and having a crystalline structure in which metal oxide layers (MO layers) including metals and oxygen and reversible lithium layers are repeatedly stacked, wherein in a lattice configured by oxygen atoms of the MO layers adjacent to each other, the dopant time of charge, thereby forming a lithium trap and/or lithium dumbbell structure.

Positive electrode active material for lithium secondary battery, comprising lithium cobalt oxide for high voltage, and method for preparing same

Provided is a cobalt precursor for preparing a lithium cobalt oxide of a layered structure which is included in a positive electrode active material, wherein the cobalt precursor is cobalt oxyhydroxide (CoM'OOH) doped with, as dopants, magnesium (Mg) and M&#x2032; different from the magnesium.

Metal-doped cobalt precursor for preparing positive electrode active material for secondary battery

Provided are a metal element-doped positive electrode active material for a high voltage and a preparation method thereof. The positive electrode active material may include a lithium cobalt oxide having a layered crystal structure; and a metal element (M) incorporated into the lithium cobalt oxide in an amount of 0.2 parts by weight to 1 part by weight with respect to 100 parts by weight of the lithium cobalt oxide, wherein the metal element (M) does not form a chemical bond with the elements of the lithium cobalt oxide, and wherein the layered crystal structure in maintained at a positive electrode potential of more than 4.5 V (based on Li potential) when fully charged.

Metal-doped positive electrode active material for high voltage

Provided is a positive electrode active material particle including a core that includes lithium cobalt oxide represented by the following Chemical Formula 1; and a shell that is located on the surface of the core and includes lithium cobalt phosphate represented by the following Chemical Formula 2, wherein the shell has a tetrahedral phase:LiCoMOA&#x2003;&#x2003;(1) wherein M is at least one of Ti, Mg, Zn, Si, Al, Zr, V, Mn, Nb, or Ni, A is oxygen-substitutional halogen, and 0.95&#x2264;a&#x2264;1.05, 0&#x2264;x&#x2264;0.2, 0&#x2264;y&#x2264;0.2, and 0&#x2264;x+y&#x2264;0.2,LiCoPO&#x2003;&#x2003;(2) wherein 0&#x2264;b&#x2264;1.

Positive electrode active material particle including core including lithium cobalt oxide and shell including lithium cobalt phosphate and preparation method thereof

The present invention relates to a positive electrode active material for a lithium secondary battery including a lithium cobalt oxide having a core-shell structure, wherein the lithium cobalt-doped oxide of the core and the lithium cobalt-doped oxide of the shell include each independently three kinds of dopants and satisfy specific conditions, a method for producing the same, and a positive electrode and a secondary battery containing the positive electrode active material.

Positive electrode active material for lithium secondary battery including lithium cobalt oxide having core-shell structure, method for producing the same, and positive electrode and secondary battery including the positive electrode active material

Provided are positive electrode active material particles for a secondary battery which include a lithium cobalt oxide, a coating layer including element A and formed on a surface of particles of the lithium cobalt oxide, and a dopant containing element B which is substituted in the lithium cobalt oxide, wherein the element A and the element B are each independently at least one selected from the group consisting of aluminum (Al), titanium (Ti), magnesium (Mg), zirconium (Zr), barium (Ba), calcium (Ca), tantalum (Ta), niobium (Nb), and molybdenum (Mo), and a molar ratio of the element A in the coating layer:the element B of the dopant is greater than 1:1 to 10:1.

Positive electrode active material for lithium secondary battery including high-voltage lithium cobalt oxide with doping element and method of preparing the same

Disclosed are a precursor for preparation of a lithium composite transition metal oxide, a method for preparing the same and a lithium composite transition metal oxide obtained from the same. More particularly, the transition metal precursor which has a composition represented by Formula 1 below and is prepared in an aqueous transition metal solution, mixed with a transition metal-containing salt, including an alkaline material, the method for preparing the same and the lithium composite transition metal oxide obtained from the same are disclosed.MnM(OH)A&#x2003;&#x2003;(1)

Precursor for preparation of lithium composite transition metal oxide, method for preparing the same and lithium composite transition metal oxide obtained from the same

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Daejeon, South Korea

Bo Ram Lee