Lg Chem, Ltd

Lg Energy Solution, Ltd.

Sinyoung Park

Hong-Kyu Park

Sung Kyun Chang

Ji Eun Lee

Seung Tae Hong

Youngsun Choi

Soo Min Park

Hyo-Shik Kil

Hera Lee

Je Young Kim

Jens M Paulsen

Sun Sik Shin

Yong Tae Lee

Sung-Kyun Chang

Do Yang Jung

Ho Suk Shin

Ho Seon Shin

Hyeyun Cha

John E Namgoong

Jaesung Ahn

Geun-Chang Chung

Seungdon Choi

Jinhyung Lim

Keun Wan An

Sunkyu Kim

Young Hwa Jung

Disclosed herein is a cathode active material based on lithium nickel oxide represented by Formula 1, wherein the lithium nickel oxide has a nickel content of at least 40% among overall transition metals and is coated with a compound not reacting with an electrolyte ('non-reactive material'), which is selected from a group consisting of oxides, nitrides, sulfides and a mixture or combination thereof not reacting with an electrolyte, as well as a carbon material, at a surface of the lithium nickel oxide.

Cathode active material and lithium secondary battery containing the same

Disclosed herein are a cathode for a secondary battery, which includes a combination of one or more selected from compounds represented by Formula 1 and or more selected from compounds represented by Formula 2, as illustrated below, and a secondary battery having the same,LiMO*(1&#x2212;)LiM'O&#x2003;&#x2003;(1)(1&#x2212;)LiFePOC&#x2003;&#x2003;(2).

Positive electrode for secondary battery

Provided is a method for preparing the heat-treated mixture of an oxide powder (a) represented by Formula I and an oxide powder (b) represented by Formula II,LiCoO&#x2003;&#x2003;(I)LiMO&#x2003;&#x2003;(II)

Cathode materials for lithium battery having higher performance

Disclosed herein is a cathode active material for a lithium secondary battery, including lithium transition metal oxide, where the lithium transition metal oxide is coated with carbon particles and a polymer resin at a surface thereof, and the polymer resin is a substance inactivated by an electrolyte for a lithium secondary battery and an organic solvent and has a melting point of at least 80&#xb0; C. A lithium secondary battery having the disclosed cathode active material has advantages of improving rate properties and high temperature stability, so as to provide excellent cell characteristics.

Cathode active material for lithium secondary battery

Provided is a cathode for lithium secondary batteries comprising a combination of one or more compounds selected from Formula 1 and one or more compounds selected from Formula 2. The cathode provides a high power lithium secondary battery composed of a non-aqueous electrolyte which exhibits long lifespan, long-period storage properties and superior stability at ambient temperature and high temperatures.

Cathode based upon two kinds of compounds and lithium secondary battery comprising the same

Disclosed herein is an additive for improvement in safety of an electrochemical device, including an inner core and an outer coating layer, wherein the inner core is formed using a volume-expandable material fused at more than a predetermined temperature while the outer coating layer is formed using a conductive material with higher conductivity than that of the inner core and covers an outer face of the inner core. The disclosed additive rapidly increases resistance of the electrochemical device before ignition/explosion of the device caused by temperature rise, thereby effectively preventing ignition/explosion of the electrochemical device without deterioration in performance of the electrochemical device.

Additive for electrochemical element to improve safety

Disclosed herein is a cathode active material based on lithium nickel-manganese-cobalt oxide represented by Formula 1, wherein an ion-conductive solid compound and conductive carbon are applied to a surface of the lithium nickel-manganese-cobalt oxide. A lithium secondary battery having the disclosed cathode active material has improved rate properties and high temperature stability, in turn embodying excellent cell performance.

Disclosed herein is a cathode active material based on lithium nickel-manganese-cobalt oxide represented by Formula 1, wherein the lithium nickel-manganese-cobalt oxide has nickel content of at least 40% among overall transition metals and is coated with an ion-conductive solid compound at a surface thereof. A lithium secondary battery having the disclosed cathode active material has advantages of not deteriorating electrical conductivity while maintaining high temperature stability, so as to efficiently provide high charge capacity.

Provided is an electrode active material comprising a nickel-based lithium transition metal oxide (LiMO) wherein the nickel-based lithium transition metal oxide contains nickel (Ni) and at least one transition metal selected from the group consisting of manganese (Mn) and cobalt (Co), wherein the content of nickel is 50% or higher, based on the total weight of transition metals, and has a layered crystal structure and an average primary diameter of 3 &#x3bc;m or higher, wherein the amount of Nitaking the lithium site in the layered crystal structure is 5.0 atom % or less.

Electrode active material for lithium secondary battery

Provided is a cathode active material composed of lithium nickel oxide represented by Formula 1, wherein the lithium nickel oxide contains nickel in an amount of 40% or higher, based on the total weight of transition metals, and the cathode active material comprises a first coating layer provided on the surface thereof and a second coating layer provided on the surface of the first coating layer, wherein the first coating layer is composed of a non-reactive material selected from the group consisting of oxides, nitrides, sulfides and mixtures or complexes thereof and the second coating layer is composed of a carbon-based material.

Cathode materials and lithium secondary battery containing the same

Provided is a lithium transition metal oxide having an &#x3b1;-NaFeOlayered crystal structure, as a cathode active material for lithium secondary battery, wherein the transition metal includes a blend of Ni and Mn, an average oxidation number of the transition metals except lithium is +3 or higher, and the lithium transition metal oxide satisfies Equations 1 and 2:1.0&#x3c;(Ni)/(Mn)&#x2003;&#x2003;(1)(Ni)/(Mn)&#x3c;1&#x2003;&#x2003;(2)wherein m(Ni)/m(Mn) represents a molar ratio of nickel to manganese and m (Ni)/m (Mn) represents a molar ratio of Nito Mn. The cathode active material of the present invention has a uniform and stable layered structure through control of oxidation number of transition metals to a level higher than +3, in contrast to conventional cathode active materials, thus advantageously exerting improved overall electrochemical properties including electric capacity, in particular, superior high-rate charge/discharge characteristics.

Provided is a cathode material for a lithium secondary battery, comprising a heat-treated mixture of an oxide powder (a) represented by Formula I and an oxide powder (b) represented by Formula II, wherein a mixing ratio of the oxide powder (a):oxide powder (b) is in a range of 30:70 to 90:10, the oxide powder (a) is monolithic particles having a D50 of more than 10 &#x3bc;m, and the oxide powder (b) is agglomerated particles having a D50 of less than 10 &#x3bc;m, and heat treatment is carried out at a temperature of 400&#xb0; C. or higher.LiCoO&#x2003;&#x2003;(I)LiMO&#x2003;&#x2003;(II)

Provided is a cathode for lithium secondary batteries comprising a combination of one or more compounds selected from Formula 1 and one or more compounds selected from Formula 2. The cathode provides a high-power lithium secondary battery composed of a non-aqueous electrolyte which exhibits long lifespan, long-period storage properties and superior stability at ambient temperature and high temperatures.

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Daejeon, South Korea

Sinyoung Park