Patent Number: 6,165,642

Title: Rechargeable lithium battery having an improved cathode and process for the production thereof

Abstract: A rechargeable lithium battery comprising at least a cathode, a separator, an anode, and an electrolyte or electrolyte solution integrated in a battery housing, is characterized by a cathode constituted of a specific powdery cathode active material having a large specific surface area and a primary particle size of 0.5 .mu.m or less. The cathode active material is obtained by mixing a salt of a transition metal in and dissolving the salt in an aqueous solution containing at least a water-soluble polymer material to obtain a product, and baking the product to form the powdery cathode active material for use as the cathode active material of the cathode. Alternatively, the cathode active material is obtained by mixing a salt of a transition metal in a monomer capable of forming at least a water-soluble polymer material, polymerizing the monomer to obtain a polymerized product, and baking the polymerized product to form the powdery cathode active material for use as the cathode active material of the cathode. A process for the production of the rechargeable lithium battery is also provided.

Inventors: Kawakami; Soichiro (Nara, JP), Kobayashi; Naoya (Nara, JP), Asao; Masaya (Tsuzuki-gun, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: H01M 4/48 (20060101); H01M 4/50 (20060101); H01M 10/40 (20060101); H01M 4/52 (20060101); H01M 4/54 (20060101); H01M 10/36 (20060101); H01M 004/36 (); H01M 004/48 (); H01M 004/58 ()

Expiration Date: 12/26/2017