Lithium Ion Secondary Battery

• US 20080038631A1
• Filed: 12/12/2005
• Published: 02/14/2008
• Est. Priority Date: 12/13/2004
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nakura, Kensuke, Shimada, Mikinari
• Application Number:
  US11/658,143
• Publication Number:
  US 20080038631A1
• Time in Patent Office: Days
• US Class Current: 429/144
• 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 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• 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 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• 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 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/423 Polyamide resins
• CPC Class Codes: H01M 50/449 having a layered structure
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: H01M 50/489 Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• 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: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A lithium ion secondary battery includes a positive electrode comprising a composite lithium oxide; a negative electrode capable of charge and discharge; a separator; and a non-aqueous electrolyte including a non-aqueous solvent and a solute dissolved therein. The separator includes at least one heat-resistant porous film and at least one shut-down layer. A porous membrane is bonded to a surface of at least one selected from the positive electrode and the negative electrode, and the porous membrane comprises an inorganic oxide filler and a binder.

Claims

1. A lithium ion secondary battery comprising:

a positive electrode comprising a composite lithium oxide;

a negative electrode capable of charge and discharge;

a separator; and

a non-aqueous electrolyte comprising a non-aqueous solvent and a solute dissolved therein,

wherein said separator comprises at least one heat-resistant porous film and at least one shut-down layer,

a porous membrane is bonded to a surface of at least one selected from said positive electrode and said negative electrode, and

said porous membrane comprises an inorganic oxide filler and a binder.

2. The lithium ion secondary battery in accordance with claim 1, wherein said heat-resistant porous film comprises a heat-resistant resin with a heat deformation temperature of 200°

C. or more.

3. The lithium ion secondary battery in accordance with claim 2, wherein said heat-resistant resin comprises at least one selected from the group consisting of polyimide, aramid, and polyphenylene sulfide.

4. The lithium ion secondary battery in accordance with claim 1, wherein said shut-down layer comprises a thermoplastic porous film, and said thermoplastic porous film becomes substantially non-porous at a shut-down temperature of 80°

C. or more and 180°

C. or less.

5. The lithium ion secondary battery in accordance with claim 1, wherein a ratio of said filler to a total of said filler and said binder is 50% by weight or more and 99% by weight or less, and said filler comprises alumina or magnesia.