Secondary battery and method of producing the same

• US 20030175585A1
• Filed: 01/17/2003
• Published: 09/18/2003
• Est. Priority Date: 04/24/2001
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Ito, Shuji, Ugaji, Masaya, Iwamoto, Kazuya, Mino, Shinji, Matsuda, Hiromu, Higuchi, Hiroshi
• Granted Patent: US 7,094,500 B2
• Time in Patent Office: Days
• US Class Current: 429/162
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 4/0421 involving vapour deposition
• CPC Class Codes: H01M 4/0426 Sputtering
• 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 29/49115 including coating or impregnating

Abstract

A secondary battery comprising: a substrate; a first current collector; a first electrode; a solid electrolyte; a second electrode; and a second current collector; the first current collector being formed on the substrate and serving as a current collector of the first electrode, the first electrode being formed on the first current collector, the solid electrolyte being formed on the first electrode, the second electrode being formed on the solid electrolyte, the second current collector being formed on the second electrode and serving as a current collector of the second electrode, at least one electrode selected from the group consisting of the first electrode and the second electrode containing at least one material selected from the group consisting of an ion conductive material and an electron conductive material.

Claims

1. A secondary battery comprising:

a substrate;

a first current collector;

a first electrode;

a solid electrolyte;

a second electrode; and

a second current collector;

said first current collector being formed on said substrate and serving as a current collector of said first electrode,

said first electrode being formed on said first current collector,

said solid electrolyte being formed on said first electrode,

said second electrode being formed on said solid electrolyte,

said second current collector being formed on said second electrode and serving as a current collector of said second electrode,

at least one electrode selected from the group consisting of said first electrode and said second electrode containing at least one material selected from the group consisting of an ion conductive material and an electron conductive material.

2. The secondary battery in accordance with claim 1,

wherein the volume percentage of said material in said at least one electrode is not less than 5 vol % and not more than 50 vol %.

3. The secondary battery in accordance with claim 1,

wherein said at least one electrode has at least one groove formed along at least one of contact surfaces between said electrode and the current collector thereof and between said electrode and said solid electrolyte, said at least one material being filled inside said groove.

4. The secondary battery in accordance with claim 1, wherein said at least one electrode contains at least said ion conductive material, said ion conductive material extending in the thickness direction of said electrode to form at least one ion conducting path connected with said solid electrolyte.

5. The secondary battery in accordance with claim 1,

wherein said at least one electrode contains at least said electron conductive material, said electron conductive material extending in the thickness direction of said electrode to form at least one electron conducting path connected with the current collector thereof.

6. The secondary battery in accordance with claim 4,

wherein the amount of said ion conductive material forming said ion conducting path decreases from the solid electrolyte side toward the other side.

7. The secondary battery in accordance with claim 5,

wherein the amount of said electron conductive material forming said electron conducting path decreases from the current collector side to the other side.

11. The secondary battery in accordance with claim 1,

wherein said secondary battery is an all solid-state thin film lithium secondary battery.

8. A method of producing a secondary battery, comprising:

(1) a first step of forming a first current collector on a substrate;

(2) a second step of forming a first electrode on said first current collector;

(3) a third step of forming a solid electrolyte on said first electrode;

(4) a fourth step of forming a second electrode on said solid electrolyte; and

(5) a fifth step of forming a second current collector on said second electrode,

said first step through said fifth step each independently employing a chemical gas phase reaction process, a sputter process, an ion beam vapor deposition process, an electron beam vapor deposition process, a resistance heating vapor deposition process or a laser ablation process,

at least said second step being a step of alternately or simultaneously depositing a first electrode material and an ion conductive material and/or electron conductive material on said first current collector, thereby forming said first electrode, or at least said fourth step being a step of alternately or simultaneously depositing a second electrode material and an ion conductive material and/or electron conductive material on said solid electrolyte, thereby forming said second electrode.

9. The method of producing a secondary battery in accordance with claim 8,

wherein at least said second step comprises a step (2a) of depositing said first electrode material on said first current collector so as to form a groove and a subsequent step (2b) of filling, inside said groove, said ion conductive material and/or electron conductive material, or at least said fourth step comprises a step (4a) of depositing said second electrode material on said solid electrolyte so as to form a groove and a subsequent step (4b) of filling, inside of said groove, said ion conductive material and/or electron conductive material.

10. The method of producing a secondary battery in accordance with claim 9, further comprising a step of planarizing each surface of said electrodes, after said step (2b) and/or said step (4b).

12. The method of producing a secondary battery in accordance with claim 8,

wherein said secondary battery is an all solid-state thin film lithium secondary battery.