Electrode for lithium ion secondary battery and production method therefor

Patent metadata

Field	Value
Publication number	US-10700345-B2
Application number	US-201716079392-A
Country	US
Kind code	B2
Filing date	Feb 14, 2017
Priority date	Feb 24, 2016
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

To provide an electrode for a lithium ion secondary battery capable of enhancing a charge and discharge cycle durability of an electrode that uses a resin current collector. An electrode for a lithium ion secondary battery provided with a resin current collector including a polyolefin resin matrix and a conductive filler A, and an electrode active material layer provided on the resin current collector, in which a crosslinked resin thin-film layer, which contains an Ni filler as a conductive filler B that does not alloy with Li and which has impermeability to the electrolyte solution, is arranged between the resin current collector and a negative electrode active material layer.

First claim

The invention claimed is:

1. An electrode for a lithium ion secondary battery comprising:
a resin current collector including a polyolefin resin matrix and a conductive filler A;
a negative electrode active material layer provided on the resin current collector,
a crosslinked resin thin-film layer, which contains an Ni filler as a conductive filler B that does not alloy with Li and which has impermeability to an electrolyte solution, arranged between the resin current collector and the negative electrode active material layer; and
an intermediate layer having an electric conductivity arranged between the resin current collector and the thin-film layer,
wherein a content of the Ni filler is from 50 to 90% by mass relative to 100% by mass of a total amount of the thin-film layer.

2. The electrode for a lithium ion secondary battery according to claim 1 , wherein the thin-film layer contains a crosslinked epoxy resin as the crosslinked resin, and the conductive filler B.

3. The electrode for a lithium ion secondary battery according to claim 1 , wherein the intermediate layer is an epoxy resin layer A containing a carbon-based conductive filler.

4. The electrode for a lithium ion secondary battery according to claim 1 , wherein an epoxy resin layer B containing a carbon-based conductive filler is arranged on a resin current collector surface that is opposite to the surface on which the negative electrode active material layer is formed.

5. A power source obtained by laminating a plurality of single battery layers having the electrode for a lithium ion secondary battery according to claim 1 .

6. A method for producing an electrode for a lithium ion secondary battery comprising:
a step of forming a resin current collector by using a composition for forming a resin current collector which contains a polyolefin resin matrix and a conductive filler A,
a step of forming an intermediate layer by coating a slurry for intermediate layer containing a conductive filler on top of the resin current collector on the side proximate to a negative electrode active material layer followed by drying,
a step of forming a thin-film layer which has conductivity and has impermeability to an electrolyte solution by coating a slurry for thin-film layer containing an Ni filler as a conductive filler B that does not alloy with Li and a crosslinked resin on top of the intermediate layer followed by drying, wherein a content of the Ni filler is from 50 to 90% by mass relative to 100% by mass of a total amount of the thin-film layer, and
a step of forming an electrode active material layer by coating an electrode slurry containing an electrode active material on top of the thin-film layer followed by drying.

7. The method for producing an electrode for a lithium ion secondary battery according to claim 6 , wherein the crosslinked resin is an epoxy resin.

8. The method for producing an electrode for a lithium ion secondary battery according to claim 6 , wherein the step of forming the intermediate layer is to form an epoxy resin layer A as the intermediate layer, and the slurry contains a carbon-based conductive filler and an epoxy resin followed by drying.

9. The method for producing an electrode for a lithium ion secondary battery according to claim 6 , further comprising a step of forming an epoxy resin layer B by coating, on a surface side of the resin current collector that is opposite to the side proximate to the negative electrode active material layer, a slurry containing a carbon-based conductive filler and an epoxy resin followed by drying.

Assignees

• Nissan Motor

Inventors

• Ohsawa Yasuhiko
• Kusachi Yuki
• Satou Hajime
• Akama Hiroshi
• Horie Hideaki
• Shoji Naofumi
• Okura Masatoshi

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title