Cell electrode sheet with displaced electrode depolarizing mixes

• US 6,027,835 A
• Filed: 12/10/1997
• Issued: 02/22/2000
• Est. Priority Date: 12/11/1996
• Status: Expired due to Term

• Current Assignee: RYUJIN Patent & Licensing Ltd.
• Original Assignee: Fuji Film Celltec Co., Ltd, Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Fukumura, Kenichi, Tomiyama, Hideki, Tanaka, Mitsutoshi
• Primary Examiner(s): Nuzzolillo, Maria
• Assistant Examiner(s): TSANG FOSTER, SUSY N
• Application Number:
  US08/988,180
• Time in Patent Office: 804 Days
• Field of Search: 429/94, 429/164, 429/241, 429/242, 429/243, 429/209, 429/233, 29/2, 29/623.1, 29/623.3, 29/623.5
• US Class Current: 429/233
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 4/02 Electrodes composed of, or comprising, active material
• 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 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• 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

An electrode sheet having a current collector coated with electrode depolarizing mix on both upper and lower surfaces of the current collector, wherein: the electrode sheet has a portion of the current collector not coated with the electrode depolarizing mix; and the electrode depolarizing mix coated ends on both the upper and lower surfaces of the current collector are shifted by 0.3 mm or longer and 30 mm or shorter in a longitudinal direction of the electrode sheet.

Claims

1. An electrode sheet having a current collector coated with electrode depolarizing mix on both upper and lower surfaces of the current collector, wherein:

the electrode sheet has portions of the current collector not coated with the electrode depolarizing mix at both ends of the upper and lower surfaces of the current collector; and

the electrode depolarizing mix coated ends on both the upper and lower surfaces of the current collector are offset relative to one another and are shifted by 0.3 mm or longer and 30 mm or shorter in a longitudinal direction of the electrode sheet.

2. An electrode sheet according to claim 1, wherein cross sections of the electrode depolarizing mix coated first and second ends in the longitudinal direction of the electrode sheet are symmetrical on both upper and lower surfaces of the electrode sheet.

3. An electrode sheet according to claim 1, wherein a thickness of the current collector is 5 μ

m or more and 30 μ

m or less.

4. An electrode sheet according to claim 1, wherein a thickness of the electrode depolarizing mix coated on both upper and lower surfaces of the electrode sheet and dried is greater than a thickness of the current collector.

5. An electrode sheet according to claim 1, wherein the electrode depolarizing mix coated first and second ends on both the upper and lower surfaces have a shift of 0.5 mm or more and 10 mm or less in the longitudinal direction of the electrode sheet.

6. An electrode sheet according to claim 1, wherein first and second ends of the electrode depolarizing mix on both the upper and lower surfaces have a shift of 0.3 mm or more and 30 mm or less in the longitudinal direction of the electrode sheet.

7. An electrode sheet according to claim 1, wherein the first ends of the electrode depolarizing mix on both the upper and lower surfaces have a shift of 0.3 mm or more and 30 mm or less in the longitudinal direction of the electrode sheet, and the second ends of the electrode depolarizing mix have a shift of 0 or more and less than 0.3 mm.

8. An electrode sheet according to claim 1, wherein the current collector is made of aluminum or copper.

9. An electrode sheet according to claim 3, wherein a thickness of the electrode depolarizing mix coated on both upper and lower surfaces of the electrode sheet and dried is 30 μ

m or more and 400 μ

m or less.

10. An electrode sheet according to claim 5, wherein the electrode depolarizing mix coated first and second ends on both the upper and lower surfaces have a shift of 0.3 mm or more and 2 mm or less in the longitudinal direction of the electrode sheet.

11. An electrode sheet according to claim 5, wherein the electrode depolarizing mix coated first and second ends on both the upper and lower surfaces have a shift of 2 mm or more and 10 mm or less in the longitudinal direction of the electrode sheet.