Lg Chem, Ltd

Lg Energy Solution, Ltd.

Research Affairs of Snu & Snu R&db Foundation

Sun Sik Shin

Wang Mo Jung

Jens M Paulsen

Ho Suk Shin

Hong-Kyu Park

Hong Kyu Park

Sin Young Park

Bo Ram Lee

Hye Lim Jeon

Chi Ho Jo

Min Suk Kang

Ji Hoon Ryu

Won Tae Kim

Jong Yeol Yu

Sang Min Park

Seong Hoon Kang

Joo Hong Jin

Byung Chun Park

Jeong Ju Cho

Seoung Chul Ha

Doo Kyung Yang

Song Taek Oh

Ji Hye Kim

Sung Hoon Yu

Sinyoung Park

Min Chul Jang

Kyung Mi Lee

Yoo Sun Kang

Min Kyu You

Soo Hyun Ha

Jung Don Suk

Dae Jin Lee

Jin Hyun Park

Myung Ki Lee

Ji A Shin

Woo Yeon Kong

Kyung Lok Lee

Sangwook Lee

Hyeyun Cha

Geun Gi Min

Je Young Kim

Hyang Mok Lee

Sung Kyun Chang

Jae Hyun Lee

Sang Wook Lee

Kyoung Ho Kim

Ji Young Park

Hoe Jin Hah

Il Hong Kim

Ho Chun Lee

Young Uk Park

Seong Bae Kim

Joon Hwan Lee

Yeo June Yoon

Woo Hyun Kim

Eun Hee Lee

Eui Yong Bang

Eun Ju Kang

Joo Mi Jeon

Song Yi Yang

Kyong Won Kang

Kisuk Kang

Jihyun Hong

Byung Hyun Hwang

Young Geun Lim

A positive electrode includes: a positive electrode active material layer formed on a surface of a positive electrode current collector, including two types of positive electrode active materials with different average particle diameters (D), a conductive material, and a binder; and a carbon-based coating layer formed on a surface of the positive electrode active material layer. The two types of positive electrode active materials are each represented by Chemical Formula 1 below. The carbon-based coating layer includes a sphere-type conductive material and a binder, where the binder is included in an amount of 5 parts by weight or more and less than 10 parts by weight with respect to 100 parts by weight of the carbon-based coating layer.LiNiCoMO  [Chemical Formula 1] In Chemical Formula 1, 0≤a≤0.5, 0<x<1, 0<y<1, 0<z<1, and M is at least one of Mn and Al.

Positive electrode for lithium secondary battery and lithium secondary battery including the same

A positive electrode active material for a secondary battery including: a lithium complex transition metal oxide which contains nickel (Ni) and cobalt (Co), and contains at least one selected from the group consisting of manganese (Mn) and aluminum (Al); and a composite coating portion which is formed on a surface of the lithium complex transition metal oxide is provided. The lithium complex transition metal oxide has a nickel (Ni) content of 65 mol % or more with respect to the total transition metal content, and the composite coating portion contains cobalt (Co) and boron (B), and contains at least one selected from the group consisting of lanthanum (La), titanium (Ti), and aluminum (Al).

Positive electrode active material for secondary battery, method for preparing same, and lithium secondary battery including the same

A positive electrode includes: a positive electrode active material layer formed on a surface of a positive electrode current collector, including two types of positive electrode active materials with different average particle diameters (D), a conductive material, and a binder; and a carbon nanotube coating layer formed on a surface of the positive electrode active material layer, including carbon nanotubes and a binder: The two types of positive electrode active materials include first positive electrode active material particles which have an average particle diameter (D) of 8 μm to 20 μm and second positive electrode active material particles in the form of a single particle which have a smaller average particle diameter (D) than the average particle diameter (D) of the first positive electrode active material particles, and the positive electrode active material layer and the carbon nanotube coating layer are formed in a thickness ratio of 90:10 to 99:1.

A positive electrode active material for a lithium secondary battery includes a lithium composite transition metal oxide including transition metals including nickel (Ni), cobalt (Co), and manganese (Mn), and the lithium composite transition metal oxide is doped with doping elements including cobalt (Co) and titanium (Ti). The lithium composite transition metal oxide includes at least one lithium layer and at least one transition metal layer including the transition metals, and the lithium layer and the transition metal layer are alternately arranged. The thickness of the lithium layer ranges from 2.146 Å to 2.182 Å, and the thickness of the transition metal layer ranges from 2.561 Å to 2.595 Å.

Positive electrode active material for lithium secondary battery, method of preparing the same, and positive electrode for lithium secondary battery and lithium secondary battery including the same

A positive electrode active material is provided, including a lithium transition metal oxide containing nickel (Ni), cobalt (Co), and manganese (Mn), wherein the lithium transition metal oxide has 60 mol % or more nickel (Ni) with respect the total number of moles of transition metal except lithium, and is doped with at least any one doping element selected from the group consisting of B, Zr, Mg, Ti, Sr, W, and Al. The positive electrode active material has an average particle diameter (D) of 4 μm to 10 μm after rolling at a rolling density of 3.0 g/cmto 3.3 g/cmand has the form of a single particle. A method of preparing the positive electrode active material, a positive electrode including the positive electrode active material, and a lithium secondary battery are also provided.

Positive electrode active material for lithium secondary battery and method of preparing the same

The present invention provided a positive electrode active material for a lithium secondary battery including lithium cobalt oxide particles. The lithium cobalt oxide particles include lithium deficient lithium cobalt oxide having Li/Co molar ratio of less than 1, belongs to an Fd-3m space group, and having a cubic crystal structure, in surface of the particle and in a region corresponding to a distance from 0% to less than 100% from the surface of the particle relative to a distance (r) from the surface to the center of the particle. In the positive electrode active material for a lithium secondary battery according to the present invention, the intercalation and deintercalation of lithium at the surface of a particle may be easy, and the output property and rate characteristic may be improved when applied to a battery. Accordingly, good life property and the minimization of gas generation amount may be attained even with large sized positive electrode active material.

Positive electrode active material for lithium secondary battery, method of preparing the same and lithium secondary battery including the same

A method for preparing a positive electrode active material for a secondary battery is provided. The method includes preparing a lithium composite transition metal oxide including nickel, cobalt, and manganese (Mn), wherein the content of the nickel in the total content of the transition metal is 60 mol % or greater. The lithium composite transition metal oxide, MgFas a fluorine (F) coating source, and a boron (B) coating source undergoes dry mixing and heat treatment to form a coating portion on the particle surface of the lithium composite transition metal oxide. In addition, a positive electrode active material prepared as described above, is also provided.

Positive electrolyte active material for secondary battery, preparation method thereof, and lithium secondary battery including same

The present invention relates to a method of preparing a positive electrode active material precursor for a lithium secondary battery in which particle size uniformity and productivity may be improved by using three reactors, a method of preparing a positive electrode active material for a lithium secondary battery by using the above-prepared positive electrode active material precursor for a lithium secondary battery, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the above-prepared positive electrode active material for a lithium secondary battery.

Method of preparing positive electrode active material precursor for lithium secondary battery

Positive electrode active material for secondary battery, method for preparing same, and lithium secondary battery including same

A method of preparing a positive electrode active material includes mixing a lithium raw material and a nickel-containing transition metal hydroxide precursor containing nickel in an amount of 65 mol % or more based on a total number of moles of transition metals and performing a first heat treatment to prepare a nickel-containing lithium transition metal oxide. The method also includes mixing a boron and carbon-containing raw material and a cobalt-containing raw material with the nickel-containing lithium transition metal oxide to form a mixture, and performing a second heat treatment on the mixture to form a coating material including B and Co on a surface of the lithium transition metal oxide. A positive electrode active material prepared by the preparation method is formed, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode active material.

Positive electrode active material for lithium secondary battery, method of preparing the same, and positive electrode for lithium secondary battery and lithium secondary battery which include the positive electrode active material

The present invention provided a positive electrode active material for a lithium secondary battery including lithium cobalt oxide particles. The lithium cobalt oxide particles include lithium deficient lithium cobalt oxide having Li/Co molar ratio of less than 1, belongs to an Fd-3m space group, and having a cubic crystal structure, in surface of the particle and in a region corresponding to a distance from 0% to less than 100% from the surface of the particle relative to a distance (r) from the surface to the center of the particle. In the positive electrode active material for a lithium secondary battery according to the present invention, the intercalation and deintercalation of lithium at the surface of a particle may be easy, and the output property and rate characteristic may be improved when applied to a battery.

Disclosed is a lithium-cobalt based complex oxide represented by Formula 1 below including lithium, cobalt and manganese wherein the lithium-cobalt based complex oxide maintains a crystal structure of a single O3 phase at a state of charge (SOC) of 50% or more based on a theoretical amount:LiCoMnAO&#x2003;&#x2003;(1)

Lithium-cobalt based complex oxide having superior lifespan characteristics and cathode active material for secondary batteries including the same

The present invention relates to positive electrode active material particles and a secondary battery including the same and provides positive electrode active material particles comprising: a core including a first lithium transition metal oxide; and a shell surrounding the core, wherein the shell has a form in which metal oxide particles are embedded in a second lithium transition metal oxide, and at least a part of the metal oxide particles is present by being exposed at a surface of the shell. The positive electrode active material particles according to the present invention prevent a transition metal and an electrolyte from causing a side reaction by exposing a part of a metal oxide, having low reactivity, at a surface of the active materials, thereby improving safety and lifespan. As the electrical conductivity of the active materials becomes lower, excellent stability can be maintained even at high temperature and in battery-breakdown situations.

Positive electrode active material particles and secondary battery including 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

Provided are a positive electrode active material for a secondary battery, in which, since the positive electrode active material includes a lithium-metal oxide having high-temperature stability and a metal oxide on a surface of a particle and a surface side in the particle, there is no concern about gas generation, because the occurrence of cracks on the surface of the active material is prevented during charge and discharge, and high-temperature storage stability and life characteristics may be improved when the positive electrode active material is used in the battery, and a secondary battery including the same.

Positive electrode active material for secondary battery and secondary battery including the same

Growing community of inventors

Daejeon, South Korea

Sun Sik Shin