Electrode plate for secondary battery with nonaqueous electrolyte and process for producing same

• US 6,152,971 A
• Filed: 11/05/1997
• Issued: 11/28/2000
• Est. Priority Date: 11/06/1996
• Status: Expired due to Fees

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Miyazaki, Yuichi, Miyanowaki, Shin
• Primary Examiner(s): Chaney, Carol
• Assistant Examiner(s): TSANG FOSTER, SUSY N
• Application Number:
  US08/964,644
• Time in Patent Office: 1,119 Days
• Field of Search: 429/211, 429/233, 429/209, 29/623.1, 29/623.5, 29/2, 29/730, 204/280, 204/290 R
• US Class Current: 29/623.5
• CPC Class Codes: H01M 4/02 Electrodes composed of, or comprising, active material
• CPC Class Codes: H01M 4/04 Processes of manufacture in general
• CPC Class Codes: H01M 4/0402 Methods of deposition of the material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

The present invention provides an electrode plate for a secondary battery with a nonaqueous electrolyte, and a process for producing same capable of forming accurately and economically the active material layer on the collector surface. The process comprises the steps of: (1) applying a peelable material on a predetermined area of a collector surface, and drying same to form a peelable layer; (2) applying an electrode forming composition comprising an active material and a binder on the collector surface to form an active material layer lying over at least one area of the peelable layer previously formed; and (3) peeling the peelable layer from a collector together with a portion of the active material layer disposed on the peelable layer to partially expose the collector surface, thereby forming a noncoated portion having a predetermined pattern on the collector surface.

Claims

1. A process for producing an electrode plate for a secondary battery with a nonaqueous electrolyte, comprising the steps of:

applying a peelable material on a predetermined area at a collector surface, and drying same to form a peelable layer;

applying an electrode forming composition comprising an active material and a binder on the collector surface to form an active material layer lying over at least one area of the peelable layer previously formed; and

peeling the peelable layer from a collector together with a portion of the active material layer disposed on the peelable layer to partially expose the collector surface, thereby forming a noncoated portion having a predetermined pattern on the collector surface wherein the peeling of the peelable layer comprises pressing down a peeler sheet, which comprises at least a thermoplastic resin layer, on an area of a surface of the active material layer overlapping with the peelable layer in a heating condition while facing the thermoplastic resin layer toward the active material layer to bond the thermoplastic resin layer of the peeler sheet to a portion of the active material layer disposed on the peelable layer, and

peeling the peeler sheet from the collector surface together with the peelable layer and a portion of the active material layer disposed on the peelable layer to partially expose the collector surface, thereby forming the noncoated portion having a predetermined pattern on the collector surface.

2. A process for producing an electrode plate for a secondary battery as claimed in claim 1, wherein said peelable material is a thermoplastic resin comprises at least one resin selected from the group consisting of polyethylene and polypropylene.

3. A process for producing an electrode plate for a secondary battery as claimed in claim 1, wherein said peelable material has a melting point in a range of 100 to 250°

C.

4. A process for producing an electrode plate for a secondary battery as claimed in claim 1, wherein said peelable material has a viscosity in a range of 100 to 50,000 cps in a molten state.

5. A process for producing an electrode plate for a secondary battery as claimed in claim 1, wherein said peeler sheet is a sheet made of thermoplastic resin.

6. A process for producing an electrode plate for a secondary battery as claimed in claim 1, wherein said peeler sheet comprises a substrate sheet and the thermoplastic resin layer disposed on the substrate sheet.

7. A process for producing an electrode plate for a secondary battery as claimed in claim 1, wherein said peeler sheet comprises a substrate sheet, the thermoplastic resin layer disposed on the substrate sheet and a wax layer disposed on the thermoplastic resin layer.