Samsung Display Devices Co., Ltd.

Sung-soo Kim

Dong-Gon Park

Geun-Bae Kim

Ho-jin Kweon

Ho-Jin Kweon

Jin Koo Kang

Geun-bae Kim

Jae-phil Cho

Yong-chul Park

Hye-young Kwon

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

Active material for positive electrode used in lithium secondary battery and method of manufacturing 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.

Method of manufacturing lithium composite oxide as positive active material for lithium secondary batteries

A method of preparing a composite of organic and inorganic compounds includes the steps of reacting a mixed solution of a metal alkoxide and a silicon-containing compound with a catalyst to produce an alcogel of a metal oxide or a complex metal oxide. The metal alkoxide is prepared by reacting at least one metal with an alcohol and the mixed solution is prepared by mixing the metal alkoxide with the silicon-containing compound. An alcogel is produced from the reacting step and alcohol is impregnated within the inorganic oxide lattice structure of the alcogel. Furthermore, the method of preparing a composite of an organic and an inorganic compound includes the steps of centrifuging the alcogel to separate any alcohol from the alcogel to form a gel, adding an organic monomer the gel and polymerizing the organic monomer in-situ to form an organic polymer. The resulting composite has characteristics of both the parent organic and inorganic compounds.

Method of preparing a composite of organic and inorganic compounds

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Cheonan-si, South Korea

Sung-soo Kim