Nonaqueous electrolytic secondary battery

• US 20030091892A1
• Filed: 08/06/2002
• Published: 05/15/2003
• Est. Priority Date: 12/28/2000
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Ohira, Noriyuki, Watanabe, Shoichiro
• Granted Patent: US 7,201,994 B2
• Time in Patent Office: Days
• US Class Current: 429/62
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 2010/4292 Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
• CPC Class Codes: H01M 2200/106 PTC
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/624 Electric conductive fillers
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 4/66 Selection of materials
• 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: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A non-aqueous electrolyte secondary battery comprising: a positive electrode comprising a positive electrode current collector and a positive electrode material mixture layer formed thereon; a negative electrode comprising a negative electrode current collector and a negative electrode material mixture layer formed thereon; and a non-aqueous electrolyte, characterized in that at least one of said positive and negative electrodes has a positive temperature coefficient of resistance; and said non-aqueous electrolyte contains an additive which is stable in the normal operating voltage range of said battery and is able to polymerize at the voltage exceeding the maximum value of said operating voltage range.

Claims

1. A non-aqueous electrolyte secondary battery comprising:

a positive electrode comprising a positive electrode current collector and a positive electrode material mixture layer formed thereon;

a negative electrode comprising a negative electrode current collector and a negative electrode material mixture layer formed thereon; and

a non-aqueous electrolyte, characterized in that

(1) at least one of said positive and negative electrodes has a positive temperature coefficient of resistance,

(2) said non-aqueous electrolyte contains an additive which is stable at the normal operating voltage range of said battery and is able to polymerize at the voltage exceeding the maximum value of said operating voltage range.

2. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein a resistance value at 110 to 130°

C. of at least one of said positive and negative electrodes is 100 times or greater than a resistance value at 25°

C. of the same electrode.

3. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein a resistivity at 120°

C. of at least one of said positive and negative electrodes is 10⁷ Ω

·

cm or more.

4. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said additive is at least one selected from the group consisting of biphenyl, 3-chlorothiophene, furan, o-terphenyl, m-terphenyl, p-terphenyl, diphenyl ether, 2,3-benzofuran, bis(p-tolyl)ether, diallyl ether, allyl butyl ether, 3-phenoxy toluene and cyclohexyl benzene.

5. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein a resistance layer having a positive temperature coefficient of resistance is formed on the surface of at least one of said positive electrode current collector and said negative electrode current collector.

6. The non-aqueous electrolyte secondary battery in accordance with claim 5, wherein said positive electrode current collector comprises aluminum and said resistance layer comprises a mixture of a conductive particulate material and a binder polymer.

7. The non-aqueous electrolyte secondary battery in accordance with claim 6, wherein said particulate material comprises a carbon material.

8. The non-aqueous electrolyte secondary battery in accordance with claim 6, wherein said binder polymer is at least one selected from the group consisting of polyethylene, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, ethylene-propylene-vinyl acetate copolymer, polypropylene, polyacrylonitrile and aromatic hydrocarbon having vinyl group-conjugated diene copolymer.

9. The non-aqueous electrolyte secondary battery in accordance with claim 5, wherein said negative electrode current collector comprises copper or nickel and said resistance layer comprises a mixture of a conductive particulate material and a binder polymer.

10. The non-aqueous electrolyte secondary battery in accordance with claim 9, wherein said particulate material comprises copper or nickel.

11. The non-aqueous electrolyte secondary battery in accordance with claim 9, wherein said binder polymer is at least one selected from the group consisting of polyethylene, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, ethylene-propylene-vinyl acetate copolymer, polypropylene, polyacrylonitrile and aromatic hydrocarbon having a vinyl group-conjugated diene copolymer.

12. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein a ratio of battery capacity C (mAh) to facing area A (cm²) of said positive and negative electrodes:

C/A value is 0.2 to 6.0 mAh/cm².

13. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein a ratio of battery capacity C (mAh) to facing area A (cm²) of said positive and negative electrodes:

C/A value is 0.2 to 4.5 mAh/cm².