Non-aqueous electrolyte secondary battery

• US 8,367,245 B2
• Filed: 09/14/2006
• Issued: 02/05/2013
• Est. Priority Date: 09/14/2005
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Fukumoto, Yusuke, Inoue, Kaoru
• Primary Examiner(s): RHEE, JANE J
• Application Number:
  US11/520,571
• Publication Number:
  US 20100227207A1
• Time in Patent Office: 2,336 Days
• Field of Search: 429/215, 429/224
• US Class Current: 429/215
• 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 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• 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 50/446 Composite material consisting of a mixture of organic and inorganic materials
• 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 having a high negative electrode energy density, good safety and high discharge characteristics is provided without damaging manufacturing facilities. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a porous heat-resistant layer interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The negative electrode comprises a negative electrode current collector and a negative electrode mixture layer on a surface of the negative electrode current collector, and the negative electrode mixture layer has an active material density of 1.5 g/ml to 1.8 g/ml. The porous heat-resistant layer is carried on the negative electrode, and the porous heat-resistant layer comprises magnesium oxide particles having a mean particle size of 0.5 μm to 2 μm.

Claims

1. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator interposed between said positive electrode and said negative electrode, a porous heat-resistant layer interposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte, said positive and negative electrodes being wound with said separator and said porous heat-resistant layer,

said negative electrode comprising a negative electrode current collector and a negative electrode mixture layer on a surface of said negative electrode current collector,

said negative electrode mixture layer having an active material density of 1.5 g/ml to 1.8 g/ml,

said porous heat-resistant layer being carried on said negative electrode, and said porous heat-resistant layer comprising magnesium oxide particles having a mean particle size of 0.5 μ

m to 2 μ

m,

wherein said porous heat-resistant layer contains 1 to 5 parts by weight of a binder per 100 parts by weight of said magnesium oxide particles, and said porous heat-resistant layer has a thickness of 1 μ

m to 5 μ

m.

3. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said magnesium oxide particles have a BET specific surface area of 3 m²/g to 15 m²/g.

4. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said porous heat-resistant layer has a porosity of 30% to 70%.

2. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a porous heat-resistant layer interposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte, said positive and negative electrodes being wound with said porous heat-resistant layer,

said negative electrode comprising a negative electrode current collector and a negative electrode mixture layer on a surface of said negative electrode current collector,

said negative electrode mixture layer having an active material density of 1.5 g/ml to 1.8 g/ml,

said porous heat-resistant layer being carried on said negative electrode, and said porous heat-resistant layer comprising magnesium oxide particles having a mean particle size of 0.5 μ

m to 2 μ

m,

wherein a separator is not provided between said positive electrode and said negative electrode, said porous heat-resistant layer contains 1 to 5 parts by weight of a binder per 100 parts by weight of said magnesium oxide particles, and said porous heat-resistant layer has a thickness of 2 μ

m to 15 μ

m.

5. The non-aqueous electrolyte secondary battery in accordance with claim 2, wherein said magnesium oxide particles have a BET specific surface area of 3 m²/g to 15 m²/g.

6. The non-aqueous electrolyte secondary battery in accordance with claim 2, wherein said porous heat-resistant layer has a porosity of 30% to 70%.