Lg Chem, Ltd

Lg Energy Solution, Ltd.

Hye Lim Jeon

Wang Mo Jung

Sun Sik Shin

Bo Ram Lee

Dong Hun Lee

Sang Wook Lee

Sung Bin Park

Seong Hoon Kang

Sang Min Park

Byung Chun Park

Min Suk Kang

So Ra Baek

Eun Sol Lho

Myung Ki Lee

Woo Yeon Kong

Sangwook Lee

Geun Gi Min

Hong Kyu Park

Ho Suk Shin

Ji Young Park

Seul Ki Kim

Tae Gon Kim

A positive electrode active material for a secondary battery includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), and a glassy coating layer formed on surfaces of particles of the lithium composite transition metal oxide, wherein, in the lithium composite transition metal oxide, an amount of the nickel (Ni) in a total amount of transition metals is 60 mol % or more, and an amount of the manganese (Mn) is greater than an amount of the cobalt (Co), and the glassy coating layer includes a glassy compound represented by Formula 1.LiMO  [Formula 1]

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

A positive electrode active material includes a core and a coating layer disposed on the core, wherein the core includes LiMO, wherein M is at least one element selected from the group consisting of nickel (Ni), cobalt (Co), and copper (Cu), and 1≤x≤5 and 0≤y≤2, and the coating layer includes carbon-based particles, wherein the carbon-based particle includes a structure in which a plurality of graphene sheets are connected, the carbon-based particle has an oxygen content of 1 wt % or more in the carbon-based particle, and the carbon-based particle has a D/G peak ratio of 1.55 or less during Raman spectrum measurement. A method of preparing the positive electrode active material, a positive electrode including the positive electrode active material, and a secondary battery including the positive electrode are also provided.

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

Provided are various embodiments of a positive electrode for a secondary battery, which in one embodiment includes a first positive electrode material mixture layer formed on a positive electrode collector, and a second positive electrode material mixture layer formed on the first positive electrode material mixture layer, wherein the first positive electrode material mixture layer has an operating voltage of 4.25 V to 6.0 V and includes an active material for overcharge which generates lithium and gas during charge; a method of preparing such a positive electrode for a secondary battery; and a lithium secondary battery including such a positive electrode.

Positive electrode for secondary battery and secondary battery including the same

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

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

The present invention relates to an active material for a lithium secondary battery, which includes a secondary particle formed by agglomeration of primary particles which include a lithium titanium composite oxide represented by Formula 1 or Formula 2, wherein a pore volume is in a range of 0.001 cm/g to 0.05 cm/g, and a method of preparing the same, wherein the active material for a lithium secondary battery according to the present invention may maintain an adequate pore volume even during rolling, because strength of the secondary particle is improved by controlling a particle diameter of the primary particle by introducing a metallic element.

Negative electrode active material, and negative electrode and lithium secondary battery which include the same

The present invention provides a negative electrode active material for a secondary battery, the negative electrode active material including a core that includes a lithium titanium oxide and a surface treatment layer located on a surface of the core, wherein the surface treatment layer includes a boron-containing lithium oxide at an amount that allows a boron content to have a molar ratio of 0.002 to 0.02 with respect to 1 mole of the lithium titanium oxide, and when 2 g of the negative electrode active material is titrated at pH 5 or lower using 0.1 M HCl, a titrated amount is 0.9 to 1.5 ml, and a secondary battery including the same. The negative electrode active material exhibits an excellent capacity recovery rate and an output characteristic when applied to a battery and is capable of reducing gas generation by preventing electrolyte decomposition.

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

Provided is a cathode active material including a complex coating layer, which includes M below, formed on a surface of the cathode active material through reaction of a lithium transition metal oxide represented by Formula 1 below with a coating precursor:LiMO&#x2003;&#x2003;(1) The lithium secondary battery including the cathode active material exhibits improved lifespan and rate characteristics due to superior stability.

Cathode active material for secondary batteries and secondary battery including the same

Disclosed is a cathode active material in which lithium cobalt oxide particles and manganese (Mn) or titanium (Ti)-containing lithium transition metal oxide particles co-exist and a method of preparing the same.

Cathode active material for secondary battery with enhanced lifespan characteristics and method of preparing the same

The present disclosure suppresses, by uniformly coating lithium transition metal composite oxide particles with LiNbO(1&#x2264;w&#x2264;8, 1&#x2264;x&#x2264;13, 1&#x2264;y&#x2264;20), a direct contact between a positive electrode active material and a liquid electrolyte and thereby suppresses a side reaction between the positive electrode active material and the liquid electrolyte, and improves stability at high temperatures and high voltages, and in particular, is effective in enhancing battery performance by forming LiO&#x2014;NbOthrough reacting the coating layer with Li present on the surfaces of the lithium transition metal composite oxide particles.

Surface-treated positive electrode active material for lithium secondary battery, method for preparing the same, and lithium secondary battery comprising the same

The present invention provides a lithium secondary battery, including a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and a separator provided between the positive electrode and the negative electrode, wherein the negative electrode active material may include a titanium-based composite, wherein, when the lithium secondary battery is charged to SOC 50 under C-rate conditions of 0.1 to 40 C, the titanium-based composite has a ratio of the peak area of a plane (400) and the peak area of a plane (111) of 0.76 or more in a measured X-ray diffraction spectrum (XRD). Therefore, the present invention may provide a lithium secondary battery having excellent output characteristics and a battery pack in which a BMS prediction algorithm is simplified.

Negative electrode active material including titanium-based composite, method of preparing the same and lithium secondary battery including the same

Provided is a cathode active material including a complex coating layer, which includes M below, formed on a surface of the cathode active material through reaction of a lithium transition metal oxide represented by Formula 1 below with a coating precursor:LiMO&#x2003;&#x2003;(1)wherein M is represented by MnM', M&#x2032; is at least one selected from the group consisting of Al, Mg, Ni, Co, Cr, V, Fe, Cu, Zn, Ti and B, 0.95&#x2264;x&#x2264;51.5, and 0.5&#x2264;a&#x2264;1. The lithium secondary battery including the cathode active material exhibits improved lifespan and rate characteristics due to superior stability.

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Daejeon, South Korea

Hye Lim Jeon