COATING FLUID, LAMINATED POROUS FILM, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

• US 20150140439A1
• Filed: 06/17/2013
• Published: 05/21/2015
• Est. Priority Date: 06/20/2012
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Hasegawa, Hirohiko
• Granted Patent: US 10,177,361 B2
• Time in Patent Office: Days
• US Class Current: 429/254
• CPC Class Codes: C08K 3/38 Boron-containing compounds
• CPC Class Codes: C08L 1/286 substituted with acid radicals, e.g. carboxymethyl cellulose [CMC] C08L1/282 takes precedence
• CPC Class Codes: C09D 129/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C09D 7/65 macromolecular C09D7/41-C09D7/48 take precedence
• CPC Class Codes: H01M 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• 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

Abstract

A coating liquid according to the present invention comprises polyvinyl alcohol (PVA), boric acid and/or an organometallic compound having the ability of cross-linking PVA, an inorganic filler, a water-soluble compound having a carboxyl group and/or a sulfonic group, and water. According to the present invention, a coating liquid can be obtained which is useful in the preparation of a laminated porous film having suppressed powder fall-off and excellent heat shape stability.

Claims

1. A coating liquid comprising polyvinyl alcohol (PVA), boric acid and/or an organometallic compound having the ability of cross-linking PVA, an inorganic filler, a water-soluble compound having a carboxyl group and/or a sulfonic group, and water.

2. The coating liquid according to claim 1, wherein the organometallic compound having the ability of cross-linking PVA is an organic titanium compound having the ability of cross-linking PVA.

3. The coating liquid according to claim 2, wherein the organic titanium compound is titanium lactate.

4. The coating liquid according to claim 1, wherein the water-soluble compound is a polymer compound.

5. The coating liquid according to claim 1, wherein the water-soluble compound is one or more compounds selected from the group consisting of carboxymethyl cellulose, polyacrylic acid and salts thereof.

6. The coating liquid according to claim 1, wherein the coating liquid comprises boric acid and/or an organometallic compound having the ability of cross-linking PVA in an amount of 10 parts by weight or more and 40 parts by weight or less with respect to 100 parts by weight of polyvinyl alcohol.

7. The coating liquid according to claim 1, wherein the inorganic filler is alumina.

8. The coating liquid according to claim 1, wherein the coating liquid comprises the water-soluble compound in an amount of 0.2 parts by weight or more and 2 parts by weight or less with respect to 100 parts by weight of the inorganic filler.

9. The coating liquid according to claim 1, wherein a total amount of polyvinyl alcohol and the water-soluble compound is 2 parts by weight or more and 8 parts by weight or less with respect to 100 parts by weight of the inorganic filler.

10. A laminated porous film having a heat-resistant layer formed by applying the coating liquid according to claim 1 onto one side or both sides of a substrate material porous film and removing a medium.

11. A non-aqueous electrolyte secondary battery using the laminated porous film according to claim 10 used as a separator.