Method for manufacturing lithium ion secondary cell

• US 20070226990A1
• Filed: 03/29/2007
• Published: 10/04/2007
• Est. Priority Date: 03/31/2006
• Status: Abandoned Application

• Current Assignee: Arisawa Manufacturing Company Limited
• Original Assignee: Arisawa Manufacturing Company Limited
• Inventors: Morimoto, Shozo
• Application Number:
  US11/730,169
• Publication Number:
  US 20070226990A1
• Time in Patent Office: Days
• US Class Current: 29/623.100
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/667 in the form of layers, e.g. coatings
• CPC Class Codes: H01M 6/40 Printed batteries , e.g. thin film batteries
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

The present invention provides a method for manufacturing a lithium ion secondary cell which has very good practical utility, is safe to use, is less expensive in comparison with conventional cells, and has high energy density. The present invention is a method for manufacturing a lithium ion secondary cell in which a positive electrode 1 and a negative electrode 2 are disposed via an interposed inorganic solid electrolyte 3, the method comprising forming into a three-dimensional shape the surface of an electrode selected from the positive electrode 1 and negative electrode 2 using a nanoimprint method; subsequently providing an inorganic solid electrolyte 3 on the electrode whose surface has been formed into a three-dimensional shape; and providing the other electrode on the inorganic solid electrolyte 3.

Claims

1. A method for manufacturing a lithium ion secondary cell in which a positive electrode and a negative electrode are disposed via an interposed inorganic solid electrolyte, the method comprising:

forming into a three-dimensional shape the surface of an electrode selected from the positive electrode and negative electrode using a nanoimprint method;

subsequently providing an inorganic solid electrolyte to the electrode whose surface has been formed into a three-dimensional shape; and

providing the other electrode to the inorganic solid electrolyte.

2. The method for manufacturing a lithium ion secondary cell according to claim 1, wherein the inorganic solid electrolyte in the form of a thin film is layered on the electrode whose surface has been formed into a three-dimensional shape.

3. The method for manufacturing a lithium ion secondary cell according to claim 1, wherein silicon is adopted as the active material comprising the electrode whose surface has been formed into a three-dimensional shape.

4. The method for manufacturing a lithium ion secondary cell according to claim 2, wherein silicon is adopted as the active material comprising the electrode whose surface has been formed into a three-dimensional shape.

5. The method for manufacturing a lithium ion secondary cell according to claim 3, wherein amorphous silicon or polysilicon is adopted as the silicon.

6. The method for manufacturing a lithium ion secondary cell according to claim 4, wherein amorphous silicon or polysilicon is adopted as the silicon.

7. The method for manufacturing a lithium ion secondary cell according to any of claims 1 to 6, wherein the three-dimensional shape is a shape obtained by aligning several fine columnar bodies.

8. The method for manufacturing a lithium ion secondary cell according to claim 7, wherein the height to diameter (or width) ratio of the fine columnar bodies is set to be 2:

1 or higher.

9. The method for manufacturing a lithium ion secondary cell according to any of claims 1 to 6, comprising:

providing the inorganic solid electrolyte to the electrode whose surface has been formed into a three-dimensional shape so that the three-dimensional shape is not lost;

subsequently providing the other electrode so that the three-dimensional shape on the inorganic solid electrolyte is not lost; and

subsequently filling the remaining three-dimensional shape with a filler.

10. The method for manufacturing a lithium ion secondary cell according to claim 7, wherein

the inorganic solid electrolyte is disposed on the electrode whose surface has been formed into a three-dimensional shape so that the three-dimensional shape is not lost;

the other electrode is subsequently disposed so that the three-dimensional shape on the inorganic solid electrolyte is not lost; and

the remaining three-dimensional shape is subsequently filled with a filler.

11. The method for manufacturing a lithium ion secondary cell according to claim 8, wherein

the inorganic solid electrolyte is disposed on the electrode whose surface has been formed into a three-dimensional shape so that the three-dimensional shape is not lost;

the other electrode is subsequently disposed so that the three-dimensional shape on the inorganic solid electrolyte is not lost; and

the remaining three-dimensional shape is subsequently filled with a filler.