Samsung Sdi Co., Inc.

Samsung Sde Co., Ltd.

Jae-Phil Cho

Geun-Bae Kim

Yong-Chul Park

Won-Il Jung

Sang-Moon Hwang

Sung-Soo Kim

Cheol-Soo Jung

Do-young Seung

Hyun-Sook Jung

Tae-Jun Kim

Sang-Im Yoo

Byung-Woo Park

Yong-Jeong Kim

Won-II Jung

Chan-Soo Kim

Won-Ii Jung

Won-Ll Jung

An active material for a battery includes an electrochemically reversibly oxidizable and reducible base material selected from the group consisting of a metal, a lithium-containing alloy, a sulfur-based compound, and a compound that can reversibly form a lithium-containing compound by a reaction with lithium ions and a surface-treatment layer formed on the base material and comprising a compound of the formula MXO, wherein M is at least one element selected from the group consisting of an alkali metal, an alkaline earth metal, a group 13 element, a group 14 element, a transition metal, and a rare-earth element, X is an element that is capable of forming a double bond with oxygen, k is a numerical value in the range of 2 to 4.

Active material for battery and battery having the same

A process for preparing an active material for a battery includes the steps of preparing a coating liquid by adding a compound comprising an element X that is capable of forming a double bond with oxygen, and a compound comprising at least one from the group consisting of an alkali metal, an alkaline earth metal, a group 13 element, a group 14 element, a transition metal, and a rare-earth element, to water, adding a metal source to the coating liquid to surface-treat the metal source material, drying the surface-treated metal source material to prepare an active material precursor; mixing the active material precursor with a lithium source; and heat-treating the resultant mixture to produce an active material with a surface-treatment layer comprising the compound of the formula (1):MXO&#x2003;&#x2003;(1)

Process of preparing active material for battery and active material for battery prepared therefrom

An electrolyte for a lithium battery includes a non-aqueous organic solvent, a lithium salt, and an additive comprising a) a sulfone-based compound and b) a Cto Corganic peroxide or azo-based compound. The electrolyte may further include a poly(ester)(meth)acrylate or a polymer that is derived from a (polyester)polyol with at least three hydroxyl (&#x2014;OH) groups, where a portion or all of the hydroxyl groups are substituted with a (meth)acrylic ester and the remaining hydroxyl groups that are not substituted with the (meth)acrylic ester are substituted with a group having no radical reactivity. The lithium battery comprising the electrolyte of the present invention has a significantly improved charge-discharge and cycle life characteristics, recovery capacity ratio at high temperature, and swelling inhibition properties.

Electrolyte for a lithium battery and a lithium battery comprising the same

An active material for a battery has a surface-treatment layer including a compound of the formula (1):MXO&#x2003;&#x2003;(1)

Active material for battery and method of preparing the same

A positive active material for a rechargeable lithium battery is provided. The positive active material comprises a lithiated intercalation compound and a coating layer formed on the lithiated intercalation compound. The coating layer comprises a solid-solution compound and an oxide compound having at least two coating elements, the oxide compound represented by the following Formula 1:MM'O&#x2003;&#x2003;(1)wherein M and M&#x2032; are not the same and are each independently at least one element selected from the group consisting of Zr, Al, Na, K, Mg, Ca, Sr, Ni, Co, Ti, Sn, Mn, Cr, Fe, and V; 0&#x3c;p&#x3c;1; 0&#x3c;q&#x3c;1; and 1&#x3c;&#x2266;2, where r is determined based upon p and q. The solid-solution compound is prepared by reacting the lithiated intercalation compound with the oxide compound. The coating layer has a fracture toughness of at least 3.5 MPam. A method of making the positive active material is also provided.

Positive active material for a rechargeable lithium battery, method for preparing the same and battery containing the same

An active material for a battery is provided with a coating layer based on a conductive agent, or a coating layer based on a mixture of a conductive agent, and a conductive polymeric dispersant.

Active material for battery and method of preparing same

A lithium composite oxide (Li Ni Co M O , where M is at least one metal atom selected from the group consisting of Al, Ca, Mg and B, a&equals;0.97&tilde;1.05, x&equals;0.1&tilde;0.3, and y&equals;0&tilde;0.05), prepared by a method including the steps of: (a) coprecipitating a Ni&mdash;Co composite hydroxide by adding an aqueous ammonia solution as a complexing agent, and an alkaline solution as a pH-adjusting agent, to an aqueous mixed solution containing a cobalt salt and a nickel salt; (b) adding lithium hydroxide to the composite hydroxide and thermally treating the mixture at 280&tilde;420&deg; C.; and (c) thermally treating the resultant of the step (b) at 650&tilde;750&deg; C. The average particle diameter of the lithium composite oxide decreases, or the tap density thereof increases, depending on the coprecipitation time. When the lithium composite oxide is used as a positive electrode active material, a lithium ion secondary cell having a high capacity can be obtained.

Lithium composition oxide as positive active material for lithium secondary batteries

Positive active material for rechargeable lithium battery and method of preparing same

Positive active material for rechargeable lithium battery

Disclosed is a positive active material for a rechargeable lithium battery having a higher concentration of Co in the surface portion than in the central portion. The surface portion is a region from the outermost surface to a depth of 10 microns. The positive active material is represented Li,Mn,Co,O,wherein &minus;0.1<x0.1 and 0<y<0.1. The positive active material is produced by obtaining a sol or gel cobalt material by mixing lithium salts, cobalt salts, an alcohol and chelating agents and heating the mixture, mixing the sol or gel cobalt material with LiMn,O,, and heat-treating the resulting mixture.

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Cheonan, South Korea

Jae-Phil Cho