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:
Jan. 20, 2004
Filed:
Feb. 12, 2001
Kao Corporation, Tokyo, JP;
Abstract
A lithium secondary battery including an anode and cathode containing an active material capable of incorporating and releasing lithium ions, wherein the cathode is a porous sintered material made of a lithium-transition metal oxide, the porosity of the sintered material is 15 to 60%, and the electrical conductivity is not less than 0.1 mS/cm. Since the sintered material is sufficiently sintered so that the electrical conductivity may be more than 0.1 mS/cm, the bonding power of the primary particles of the sintered material is strong, and therefore the primary particles do not come off and the electrodes do not collapse even if the sintered material expands or shrinks because of the charge/discharge. Since the mechanical strength is great, the cathode can have a larger area. The electrolyte penetrates well into the sintered material because of its 15 to 60% porosity, and consequently the internal electrical resissitivity is low. Thus a lithium secondary battery having a high capacity and excellent characteristics is provided.