Non-aqueous electrolyte secondary battery

• US 9,761,853 B2
• Filed: 04/11/2016
• Issued: 09/12/2017
• Est. Priority Date: 05/13/2015
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Umeyama, Hiroya, Fukumoto, Yusuke, Wada, Naoyuki, Yokoyama, Yuji, Hashimoto, Tatsuya, Onodera, Naoto
• Primary Examiner(s): Rhee, Jane
• Application Number:
  US15/095,349
• Publication Number:
  US 20160336568A1
• Time in Patent Office: 519 Days
• 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 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• 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 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• CPC Class Codes: H01M 50/44 Fibrous material
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/454 comprising a non-fibrous layer and a fibrous layer superimposed on one another
• CPC Class Codes: H01M 50/457 comprising three or more layers
• 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: H01M 50/491 Porosity
• 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

Provided is a non-aqueous electrolyte secondary battery in which an increase in resistance is suppressed when high rate pulsed charging and discharging is repeatedly carried out. The non-aqueous electrolyte secondary battery provided by the present disclosure is provided with: a positive electrode; a negative electrode; a separator; and a non-aqueous electrolyte solution. The separator is provided with a separator base made of a non-woven fabric; a first resin layer provided on a surface of the separator base that faces the positive electrode; and a second resin layer provided on a surface of the separator base that faces the negative electrode. In addition, a resin matrix of the first resin layer is constituted from polytetrafluoroethylene or a copolymer containing polytetrafluoroethylene as a primary component, and a resin matrix of the second resin layer is constituted from poly(vinylidene fluoride) or a copolymer containing poly(vinylidene fluoride) as a primary component.

Claims

1. A non-aqueous electrolyte secondary battery comprising:

a positive electrode;

a negative electrode;

a separator interposed between the positive electrode and negative electrode, the separator comprising;

a separator base made of a non-woven fabric;

a first resin layer provided on a surface of the separator base that faces the positive electrode; and

a second resin layer provided on a surface of the separator base that faces the negative electrode;

and

a non-aqueous electrolyte solution, wherein

a resin matrix of the first resin layer is constituted from at least one of polytetrafluoroethylene and a copolymer containing polytetrafluoroethylene as a primary component, and

a resin matrix of the second resin layer is constituted from at least one of poly(vinylidene fluoride) and a copolymer containing poly(vinylidene fluoride) as a primary component.

2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the separator base has a Gurley value, as determined using the Gurley test method, of not less than 40 sec/100 mL and not more than 55 sec/100 mL.

3. The non-aqueous electrolyte secondary battery according to claim 1, wherein at least one of the first resin layer and second resin layer contains insulating inorganic particles.

4. The non-aqueous electrolyte secondary battery according to claim 1, wherein an average thickness of the first resin layer and that of the second resin layer are each 7 μ

m or less.

5. The non-aqueous electrolyte secondary battery according to claim 1, wherein

the positive electrode includes a positive electrode active material layer having a porous structure on a surface of a positive electrode current collector,

the negative electrode includes a negative electrode active material layer having a porous structure on a surface of a negative electrode current collector, and

an average pore diameter in the negative electrode active material layer is greater than an average pore diameter in the positive electrode active material layer.

6. The non-aqueous electrolyte secondary battery according to claim 1, wherein the positive electrode, the negative electrode and the separator have an elongated shape, and a wound electrode body is constituted by overlaying and winding the positive electrode and the negative electrode in such a way as to be insulated from each other by the separator.