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

• US 10,586,966 B2
• Filed: 11/16/2015
• Issued: 03/10/2020
• Est. Priority Date: 11/28/2014
• Status: Active Grant

• Current Assignee: ZEON Corporation
• Original Assignee: ZEON Corporation
• Inventors: Takamatsu, Hiromi
• Primary Examiner(s): Pak, Hannah J
• Application Number:
  US15/527,067
• Publication Number:
  US 20180130987A1
• Time in Patent Office: 1,576 Days
• Field of Search: 523201
• CPC Class Codes: C08L 2207/53 Core-shell polymer
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 2004/028 Positive electrodes
• 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 4/622 being polymers
• CPC Class Codes: H01M 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/44 Fibrous material
• CPC Class Codes: H01M 50/443 Particulate material
• 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

Abstract

To provide a technique of trapping transition metal ions such as cobalt ions dissolved from positive electrode active material in a secondary battery to prevent deposition of transition metal on the negative electrode. Disclosed is a composition for non-aqueous secondary battery functional layer which contains organic particles containing an aliphatic conjugated diene monomer unit at an amount of 5% by mass or more based on the total monomer units in the organic particles, wherein the composition comprises the organic particles at an amount of 50% by mass or more in terms of solid content.

Claims

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

organic particles containing an aliphatic conjugated diene monomer unit at an amount of 5% by mass or more based on the total monomer units in the organic particles, wherein

the composition comprises the organic particles at an amount of 70% by mass or more in terms of solid content,

wherein the composition further comprises organic particles having a core-shell structure with a core and a shell that partially covers an outer surface of the core, wherein

the core is made of a polymer having a degree of swelling in electrolysis solution of 5 times to 30 times, and

the shell is made of a polymer having a degree of swelling in electrolysis solution greater than 1 time to 4 times.

2. The composition for non-aqueous secondary battery functional layer of claim 1, wherein the organic particles have a degree of swelling in electrolysis solution of 4 times to 30 times.

3. The composition for non-aqueous secondary battery functional layer of claim 1, wherein the organic particles have a volume-average particle diameter D50 of 250 nm to 1,000 nm.

4. A functional layer for non-aqueous secondary battery, wherein the functional layer is formed from the composition for non-aqueous secondary battery functional layer of claim 1.

5. A non-aqueous secondary battery comprising:

the functional layer for non-aqueous secondary battery of claim 4; and

a positive electrode mixed material layer containing a transition metal-containing positive electrode active material.

6. A composition for non-aqueous secondary battery functional layer, comprising:

organic particles containing an aliphatic conjugated diene monomer unit at an amount of 5% by mass or more based on the total monomer units in the organic particles, wherein

the composition comprises the organic particles at an amount of 50% by mass or more in terms of solid content,

wherein the composition further comprises organic particles having a core-shell structure with a core and a shell that partially covers an outer surface of the core,

the core is made of a polymer having a degree of swelling in electrolysis solution of 5 times to 30 times, and

the shell is made of a polymer having a degree of swelling in electrolysis solution greater than 1 time to 4 times.