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:
Aug. 15, 2006
Filed:
Apr. 06, 2005
Takao Noda, Chiba, JP;
Akihiko Shirakawa, Chiba, JP;
Joseph Gaze, Chiba, JP;
Yoshiaki Yamauchi, Nagano, JP;
Fumiyoshi Ono, Nagano, JP;
Takao Noda, Chiba, JP;
Akihiko Shirakawa, Chiba, JP;
Joseph Gaze, Chiba, JP;
Yoshiaki Yamauchi, Nagano, JP;
Fumiyoshi Ono, Nagano, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
A cathode electroactive material for use in lithium ion secondary cells, process for producing the material, and lithium ion secondary cells using the cathode electroactive material, wherein the electroactive material predominantly comprises an Li—Mn composite oxide particles with the spinel structure and particles of the electroactive material have an average porosity of 15% or less, the porosity being calculated by employing the following equation:Porosity (%)=()×100(wherein A represents a total cross-section area of pores included in a cross-section of one secondary particle, and B represents the cross-section area of one secondary particle), a tapping density of 1.9 g/ml or more, a size of crystallites of 400 Å–960 Å, a lattice constant of 8.240 Å or less. The cathode electroactive material of the present invention is formed of particles which are dense and spherical and exhibit excellent packing characteristics to an electrode, and exhibit high initial capacity and capacity retention percentage at high temperature.