Lithium secondary cell

• US 6,228,532 B1
• Filed: 08/20/1999
• Issued: 05/08/2001
• Est. Priority Date: 08/21/1998
• Status: Expired due to Fees

• Current Assignee: Pioneer Corporation
• Original Assignee: Pioneer Corporation
• Inventors: Miyake, Takako, Tsuji, Taishi, Yanagisawa, Shuuichi
• Primary Examiner(s): WEINER, LAURA S
• Application Number:
  US09/378,413
• Time in Patent Office: 627 Days
• Field of Search: 429/213, 429/218.1, 429/231.95, 429/245
• US Class Current: 429/213
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 4/02 Electrodes composed of, or comprising, active material
• CPC Class Codes: H01M 4/60 of organic compounds
• CPC Class Codes: H01M 4/608 containing heterocyclic rings
• CPC Class Codes: H01M 4/624 Electric conductive fillers
• CPC Class Codes: H01M 4/663 containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

There is provided a lithium polymer secondary cell in which reduction of the film thickness of a solid electrolyte can be realized. The lithium ion secondary cell consists essentially of a composite electrode as a positive electrode having a positive electrode layer, containing a mercaptide compound and a conductive material, carried on a collector; the hydrogen atom of at least one mercapto group in the mercaptide compound being substituted with a lithium atom; a polyelectrolyte; and a lithium negative electrode.

Claims

1. A lithium secondary cell comprising:

a composite electrode as a positive electrode having a positive electrode layer, containing a mercaptide compound and a conductive material, carried on a collector;

the hydrogen atom of at least one mercapto group in the mercaptide compound being substituted with a lithium atom;

a polyelectrolyte; and

a lithium negative electrode.

2. The lithium secondary cell according to claim 1, wherein the mercaptide compound is lithium thiocyanurate.

3. The lithium secondary cell according to claim 1, wherein the conductive material contains a polyaniline.

4. The lithium secondary cell according to claim 1, wherein the collector is a carbon film.

5. The lithium secondary cell according to any of claim 1, wherein the polyelectrolyte contains at least one of ethylene carbonate and propylene carbonate.