Patent Number: 6,309,777

Title: Explosion-resistant large capacitive lithium ion secondary battery

Abstract: An active material free part of a positive electrode is coated with an over-coat material, wherein the over-coat material has at least one of the following properties: suppression of heat transfer from the second part of the electrode to the separator; reduction of a heat transfer rate from the second part of the electrode to the separator; prevention of transfer of excess heat from the second part of the electrode to the separator; electrical isolation of the second part of the electrode from the separator; prevention of charges generated in the first active material from becoming concentrated in the second part of the electrode and discharged from the second part; and prevention of the separator from being melted by a current discharge from or into the second part of the electrode through the separator until the current discharge is shut down by a fuse function of the separator.

Inventors: Ohta; Tomoyuki (Tokyo, JP), Shirakata; Masato (Tokyo, JP), Satoh; Hajime (Kanagawa, JP)

Assignee: NEC Corporation

International Classification: H01M 10/42 (20060101); H01M 10/04 (20060101); H01M 4/02 (20060101); H01M 10/36 (20060101); H01M 10/40 (20060101); H01M 6/00 (20060101); H01M 2/20 (20060101); H01M 2/34 (20060101); H01M 6/50 (20060101); H01M 004/02 (); H01M 004/60 (); H01M 004/62 (); H01M 006/04 (); H01M 010/12 ()

Expiration Date: 10/30/2018