The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2008
Filed:
Jun. 13, 2005
Manabu Suhara, Chigasaki, JP;
Takuya Mihara, Chigasaki, JP;
Koichiro Ueda, Chigasaki, JP;
Yukimitsu Wakasugi, Chigasaki, JP;
Manabu Suhara, Chigasaki, JP;
Takuya Mihara, Chigasaki, JP;
Koichiro Ueda, Chigasaki, JP;
Yukimitsu Wakasugi, Chigasaki, JP;
Seimi Chemical Co., Ltd., Chigasaki-shi, JP;
Abstract
To provide a lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability. A positive electrode active material powder for a lithium secondary battery characterized by comprising a first granular powder having a compression breaking strength of at least 50 MPa and a second granular powder having a compression breaking strength of less than 40 MPa, formed by agglomeration of many fine particles of a lithium composite oxide represented by the formula LiNiCoMnMOF(wherein M is a transition metal element other than Ni, Co and Mn, Al or an alkaline earth metal element, 0.9≦p≦1.1, 0.2≦x≦0.8, 0≦y≦0.4, 0≦z≦0.5, y+z>0, 0≦q≦0.05, 1.9≦2−a≦2.1, x+y+z+q=1 and 0≦a≦0.02) to have an average particle size D50 of from 3 to 15 μm, in a weight ratio of the first granular powder/the second granular powder being from 50/50 to 90/10.