Composition for non-aqueous secondary battery functional layer, functional layer for non-aqueous secondary battery, and non-aqueous secondary battery

• US 10,454,084 B2
• Filed: 07/21/2016
• Issued: 10/22/2019
• Est. Priority Date: 08/11/2015
• Status: Active Grant

• Current Assignee: ZEON Corporation
• Original Assignee: ZEON Corporation
• Inventors: Asai, Kazuki, Asano, Junichi
• Primary Examiner(s): Choi, Ling Siu
• Assistant Examiner(s): Grinsted, Ronald
• Application Number:
  US15/745,831
• Publication Number:
  US 20180212218A1
• Time in Patent Office: 1,188 Days
• Field of Search: 524404
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 2205/22 Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer
• CPC Class Codes: C08L 33/26 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 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 50/409 Separators, membranes or diaphragms characterised by the material
• CPC Class Codes: H01M 50/443 Particulate material
• 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

Provided is a composition for a non-aqueous secondary battery functional layer that has excellent redispersibility of non-conductive particles and enables formation of a functional layer for a non-aqueous secondary battery having excellent flexibility. Also provided are a functional layer for a non-aqueous secondary battery formed using this composition for a non-aqueous secondary battery functional layer and a non-aqueous secondary battery including this functional layer for a non-aqueous secondary battery. The composition for a non-aqueous secondary battery functional layer contains non-conductive particles, a water-soluble polymer that includes a (meth)acrylamide monomer unit in a proportion of 40 mass % or more and has a weight average molecular weight of less than 3.0×10⁵, and a particulate polymer.

Claims

1. A composition for a non-aqueous secondary battery functional layer comprising:

non-conductive particles;

a water-soluble polymer including a (meth)acrylamide monomer unit in a proportion of 40 mass % or more and having a weight average molecular weight of 5.0×

10³ or more and less than 3.0×

10⁵; and

a particulate polymer.

2. The composition for a non-aqueous secondary battery functional layer according to claim 1, wherein

the water-soluble polymer is contained in a proportion of at least 0.1 parts by mass and not more than 10 parts by mass per 100 parts by mass of the non-conductive particles.

3. A functional layer for a non-aqueous secondary battery formed using the composition for a non-aqueous secondary battery functional layer according to claim 1.

4. A non-aqueous secondary battery comprising the functional layer for a non-aqueous secondary battery according to claim 3.

5. A functional layer for a non-aqueous secondary battery formed using the composition for a non-aqueous secondary battery functional layer according to claim 2.

6. A non-aqueous secondary battery comprising the functional layer for a non-aqueous secondary battery according to claim 5.

7. The composition for a non-aqueous secondary battery functional layer according to claim 1, wherein

the water-soluble polymer includes the (meth)acrylamide monomer unit in a proportion of 40 mass % or more and 99 mass % or less.