SECONDARY-BATTERY POROUS MEMBRANE COMPOSITION, SECONDARY-BATTERY POROUS MEMBRANE AND SECONDARY BATTERY

• US 20160344007A1
• Filed: 02/03/2015
• Published: 11/24/2016
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: ZEON Corporation
• Original Assignee: ZEON Corporation
• Inventors: TAKAMATSU, Hiromi, TOYODA, Yujiro
• Granted Patent: US 9,917,287 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C08J 2323/06 Polyethene
• CPC Class Codes: C08J 2333/26 Homopolymers or copolymers of acrylamide or methacrylamide
• CPC Class Codes: C08J 2433/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C08J 2433/26 Homopolymers or copolymers of acrylamide or methacrylamide
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 9/0066 Use of inorganic compounding ingredients
• CPC Class Codes: C09D 133/26 Homopolymers or copolymers of acrylamide or methacrylamide
• 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 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/423 Polyamide resins
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• 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

Abstract

A composition for a porous membrane of a secondary battery including a non-conductive particle and a water-soluble polymer, wherein the water-soluble polymer contains 80% by weight or more of a (meth)acrylamide monomer unit, and the water-soluble polymer has a storage modulus at 150° C. of 2.0×10⁵ Pa or more; and a porous membrane manufactured therefrom and a secondary battery including the same.

Claims

1. A composition for a porous membrane of a secondary battery, comprising a non-conductive particle and a water-soluble polymer, wherein

the water-soluble polymer contains 80% by weight or more of a (meth)acrylamide monomer unit, and

the water-soluble polymer has a storage modulus at 150°

C. of 2.0×

10⁵ Pa or more.

2. The composition for a porous membrane of a secondary battery according to claim 1, wherein a glass transition temperature obtained by measuring dynamic viscoelasticity of the water-soluble polymer is 150 to 200°

C.

3. The composition for a porous membrane of a secondary battery according to claim 1, wherein the water-soluble polymer has a weight average molecular weight of 2.0×

10⁵ to 1.00×

10⁶.

4. The composition for a porous membrane of a secondary battery according to claim 1, wherein the water-soluble polymer contains an acid group-containing monomer unit.

5. A porous membrane for a secondary battery, obtained by forming a layer of the composition for a porous membrane of a secondary battery according to claim 1, and drying the formed layer.

6. A secondary battery comprising the porous membrane for a secondary battery according to claim 5.