Electrode and method of manufacturing electrode

Patent metadata

Field	Value
Publication number	US-2016351885-A1
Application number	US-201615160693-A
Country	US
Kind code	A1
Filing date	May 20, 2016
Priority date	May 28, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

An electrode includes: a current collector that is made of a conductive material; a mixture layer that contains an active material and is arranged on one surface of the current collector; a thermoplastic resin particle layer in which a plurality of insulating thermoplastic resin particles are arranged on the mixture layer; and a porous inorganic oxide particle layer that contains plural insulating inorganic oxide particles and is arranged on an edge surface of a laminate including the current collector, the mixture layer, and the thermoplastic resin particle layer. A melting point of the inorganic oxide particles is higher than a melting point of the thermoplastic resin particles.

First claim

What is claimed is:

1 . An electrode comprising:
a current collector that is made of a conductive material; a mixture layer that contains an active material and is arranged on one surface of the current collector; a thermoplastic resin particle layer in which a plurality of insulating thermoplastic resin particles are arranged on the mixture layer; and a porous inorganic oxide particle layer that contains a plurality of insulating inorganic oxide particles having a higher melting point than the thermoplastic resin particles and is arranged on an edge surface of a laminate including the current collector, the mixture layer, and the thermoplastic resin particle layer.

2 . The electrode according to claim 1 , wherein
the electrode is a positive electrode.

3 . The electrode according to claim 1 , wherein
the inorganic oxide particle layer has a wall shape covering an entire region of the edge surface.

4 . The electrode according to claim 1 , wherein
the current collector has an exposure portion in which the mixture layer is not arranged, and in the laminate, the edge surface on a side opposite to a side where the exposure portion is present.

5 . A method of manufacturing an electrode comprising:
forming a first mixture layer by arranging a mixture, which contains an active material, on a first current collector made of a conductive material; forming a first thermoplastic resin particle layer by arranging a plurality of insulating thermoplastic resin particles on the first mixture layer; arranging a spacer at a position which is offset from a first edge surface of a first laminate including the first current collector, the first mixture layer, and the first thermoplastic resin particle layer so as not to protrude from the first edge surface; and performing the following (i) or (ii),
(i) laminating one portion of the first laminate on another portion of the first laminate with the spacer interposed therebetween, and arranging an inorganic oxide particle layer by applying inorganic oxide particles having a higher melting point than the thermoplastic resin particles to the first edge surface, and
(ii) laminating a second laminate laminating a second current collector, a second mixture layer and a second thermoplastic resin particle layer in this order on the first laminate with the spacer interposed therebetween, and
arranging an inorganic oxide particle layer by applying inorganic oxide particles having a higher melting point than the thermoplastic resin particles to the first edge surface and a second edge surface, which is on the same side of the first edge surface, of the second laminate.

6 . The method according to claim 5 , wherein
a thickness of the spacer is 5 μm to 20 μm.

7 . The method according to claim 5 , wherein
an offset amount of the spacer is 1 mm to 10 mm.

Assignees

• Toyota Motor Co Ltd

Inventors

• Umehara Masakazu

Classifications

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M10/39

  working at high temperature · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/04

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title