Lg Chem, Ltd

Ulsan National Institute of Science and Technology

Unist, Inc.

Seung Beom Cho

Myoung Hwan Oh

Jun Seok Nho

In Kook Jun

Wook Jang

Jong Pil Kim

Ick Soon Kwak

Dong Kwon Lee

Sang Soon Choi

Hwa Seok Chae

Jun Seong Ahn

Jang Yul Kim

Young Jun Hong

Jung Hee Lee

Chang Bum Ko

Hyun Ah Park

Yeo June Yoon

Gi Ra Yi

Soon Ho Jang

Kwang Ik Moon

Hyuck Lee

Won Sig Jung

Byung Hyun Min

Bae Jung Kim

Myung Gi Jeong

San Su Son

Min Jin Ko

Jin Young Park

Sang Young Lee

Ji Hoon Choi

Dong Mok Shin

Kyung Jun Kim

Se Hwan Son

Won Tae Kim

Jang Hoon Park

Jung Ho Lim

Ju Myung Kim

Min Joon Lee

Jin Wook Ju

Yoon Bin Park

Seong Ji Ye

Sang Won Woo

Sung Wook Mhin

Eun Mi Choi

A method for preparing a positive electrode active material includes: a step for adding a reaction mixture containing a lithium-raw material and a nickel-manganese-cobalt precursor into a first crucible and performing a first heat treatment at a temperature of 500-800° C. to form a pre-sintered mixture; a step for extracting the pre-sintered mixture from the first crucible and pulverizing or classifying the same; and a step for adding the pulverized or classified pre-sintered mixture into a second crucible and performing a second heat treatment at a temperature of 700-1000° C. under an atmosphere in which an oxygen partial pressure is 20% or less to form a lithium nickel-manganese-cobalt-based positive electrode active material, wherein a volume of the pre-sintered mixture formed after the first heat treatment is reduced to a volume that is 20-50% of a volume of the reaction mixture added into the first crucible.

Method for preparing positive electrode active material

A method of preparing a positive electrode active material precursor for a secondary battery includes preparing a positive electrode active material precursor by a co-precipitation reaction while adding a transition metal-containing solution containing transition metal cations, a basic solution, and an ammonium solution to a batch-type reactor, wherein a molar ratio of ammonium ions contained in the ammonium solution to the transition metal cations contained in the transition metal-containing solution added to the batch-type reactor is 0.5 or less, and a pH in the batch-type reactor is maintained at 11.2 or less.

Positive electrode active material precursor for secondary battery, preparation method thereof, and method of preparing positive electrode active material

The present invention relates to a positive electrode active material having improved capacity characteristic and life cycle characteristic, and a method of preparing the same, and specifically, to a positive electrode active material for a lithium secondary battery, wherein the positive electrode active material comprises a compound represented by Formula 1 above and allowing reversible intercalation/deintercalation of lithium, and from a crystal structure analysis of the positive electrode active material by a Rietveld method in which space group R-3m is used in a crystal structure model on the basis of an X-ray diffraction analysis, the thickness of MO slab is 2.1275 Å or less, the thickness of inter slab is 2.59 Å or greater, and the cation mixing ratio between Li and Ni is 0.5% or less, and a method of preparing the same.

Positive electrode active material for lithium secondary battery, and positive electrode comprising same

A positive electrode active material includes a lithium transition metal oxide, in which a cobalt content in the lithium transition metal oxide is less than a manganese content, wherein at least one of nickel, cobalt, and manganese in the lithium transition metal oxide has a concentration gradient that gradually changes from a center of a particle to a surface thereof, the positive electrode active material is in the form of a secondary particle formed by agglomeration of primary particles, and a ratio in which angles between c-axis directions, which are measured at at least 8 points on a surface of the positive electrode active material by TEM analysis, and a growth direction of the particle at the measuring point satisfy 85&#xb0; to 95&#xb0; is 60% or more.

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

A method of preparing a positive electrode active material which includes forming a pre-sintered mixture by adding a reaction mixture including a lithium raw material and a nickel-manganese-cobalt precursor to a first crucible and performing a primary heat treatment at a temperature of 500&#xb0; C. to 800&#xb0; C., and, after discharging the pre-sintered mixture from the first crucible, adding the pre-sintered mixture to a second crucible and performing a secondary heat treatment at a temperature of 700&#xb0; C. to 1,000&#xb0; C. to form a lithium nickel manganese cobalt-based positive electrode active material, wherein a volume of the pre-sintered mixture formed after the primary heat treatment is 20% to 50% of a volume of the reaction mixture added to the first crucible.

The present disclosure relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

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

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

The present invention relates to surface-coated positive electrode active material particles and a secondary battery including the same, and specifically, it provides surface-coated positive electrode active material particles including positive electrode active material particles and a coating layer applied on a surface of the positive electrode active material particles, wherein the coating layer includes a polyimide comprising one or more structures selected from the group consisting of pyrrole, aniline, and carbazole. The surface-coated positive electrode active material particles according to the present invention includes a coating layer including a polyimide and metal ions; and since a direct contact between the positive electrode active material particles and an electrolyte can be prevented, a side reaction therebetween can be inhibited, and both excellent lithium ion mobility and excellent electron conductivity can be exhibited. Accordingly, a secondary battery with improved battery life and cycle characteristics at high-voltage and high-temperature conditions can be obtained.

Surface-coated positive electrode active material particles and secondary battery comprising the same

Provided are a method of manufacturing a cathode active material including a first step of preparing a metal glycolate solution, a second step of mixing lithium-containing transition metal oxide particles and the metal glycolate solution and stirring in a paste state, a third step of drying the paste-state mixture, and a fourth step of performing a heat treatment on the dried mixture, a cathode active material including a metal oxide layer which is manufactured by the above method, and a secondary battery composed of a cathode including the cathode active material.

Cathode active material for secondary battery and method of manufacturing the same

The present disclosure relates to a precursor of a positive electrode active material for a secondary battery including a single layer-structured secondary particle in which pillar-shaped primary particles radially oriented in a surface direction from the particle center are aggregated, wherein the secondary particle has a shell shape, and the primary particle includes a composite metal hydroxide of Ni&#x2014;Co&#x2014;Mn of the following Chemical Formula 1, and a positive electrode active material prepared using the same:NiCoMMn(OH)&#x2003;&#x2003;[Chemical Formula 1] In Chemical Formula 1, M, x, y and z have the same definitions as in the specification.

Precursor of positive electrode active material for secondary battery and positive electrode active material prepared using the same

The present invention relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

The present invention relates to a positive electrode active material for a secondary battery, a method for preparing the same, and a secondary battery including the same, and more particularly to a positive electrode active material for a secondary battery, which includes lithium transition metal oxide particles represented by Formula 1; and lithium metal phosphate nanoparticles disposed on the surface of the lithium transition metal oxide particles and represented by Formula 2, a method for preparing the same, and a lithium secondary battery including the sameLi(NiMCo)O&#x2003;&#x2003;[Formula 1] In which, M is at least one metal selected from the group consisting of Mn, Al, Cu, Fe, Mg, Cr, Sr, V, Sc and Y, 0&#x2264;a&#x2264;0.2, 0&#x2264;b&#x2264;1, and 0&#x2264;c&#x2264;1LiM'M&#x2033;(PO)&#x2003;&#x2003;[Formula 2] In which, M&#x2032; is Al, Y, Cr, or Ca, M&#x2033; is Ge, Ti, Sn, Hf, Zn, or Zr, and 0&#x2264;x&#x2264;0.5.

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

Provided are a method of preparing a positive electrode active material for a secondary battery, in which the positive electrode active material is uniformly doped with various doping elements without worrying about surface damage of the active material and characteristics degradation by including mixing a metal precursor for a positive electrode active material and a raw material including a doping element, in which an average particle diameter ratio is in a range of 5:1 to 2,000:1, using acoustic resonance to prepare a precursor doped with the doping element, and mixing the doped precursor with a lithium raw material and performing a heat treatment, and a positive electrode active material which has improved structure stability by being prepared by the above method and may improve battery characteristics, for example, capacity reduction may be minimized and cycle characteristics may be improved when used in the battery.

Method of preparing positive electrode active material for secondary battery and positive electrode active material for secondary battery prepared thereby

The present invention relates to a method for preparing a lithium iron phosphate nanopowder, including the steps of (a) preparing a mixture solution by adding a lithium precursor, an iron precursor and a phosphorus precursor in a glycerol solvent, and (b) putting the mixture solution into a reactor and heating to prepare the lithium iron phosphate nanopowder under pressure conditions of 10 bar to 100 bar, and a lithium iron phosphate nanopowder prepared by the method. When compared to a common hydrothermal synthesis method and a supercritical hydrothermal synthesis method, a reaction may be performed under a relatively lower pressure. When compared to a common glycothermal synthesis method, a lithium iron phosphate nanopowder having effectively controlled particle size and particle size distribution may be easily prepared.

Method for preparing lithium iron phosphate nanopowder

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 carbon black, 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

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Daejeon, South Korea

Seung Beom Cho