Solid-state battery and method for producing solid-state battery

Patent metadata

Field	Value
Publication number	US-2025293285-A1
Application number	US-202519069335-A
Country	US
Kind code	A1
Filing date	Mar 4, 2025
Priority date	Mar 13, 2024
Publication date	Sep 18, 2025
Grant date	—

Abstract

A main object of the present disclosure is to provide a solid-state battery in which an increase in battery resistance caused by peeling of an electrode layer is suppressed. The present disclosure achieves the object by providing a solid-state battery comprising: a cathode current collector; a first cathode active material layer, a first solid electrolyte layer, a first anode active material layer and a first anode current collector that are laminated in this order from a first surface of the cathode current collector; and a second cathode active material layer, a second solid electrolyte layer, a second anode active material layer and a second anode current collector that are laminated in this order from a second surface opposed to the first surface of the cathode current collector, wherein each of the cathode current collector, the first anode current collector and the second anode current collector is a metal current collector, and a resin layer is disposed at least either between the first anode active material layer and the first anode current collector or between the second anode active material layer and the second anode current collector.

First claim

What is claimed is:

1 . A solid-state battery comprising:
a cathode current collector; a first cathode active material layer, a first solid electrolyte layer, a first anode active material layer and a first anode current collector that are laminated in this order from a first surface of the cathode current collector; and a second cathode active material layer, a second solid electrolyte layer, a second anode active material layer and a second anode current collector that are laminated in this order from a second surface opposed to the first surface of the cathode current collector, wherein each of the cathode current collector, the first anode current collector and the second anode current collector is a metal current collector, and a resin layer is disposed at least either between the first anode active material layer and the first anode current collector or between the second anode active material layer and the second anode current collector.

2 . A method for producing a solid-state battery, the method comprising:
a preparing step of preparing a layered body including a cathode active material layer, a solid electrolyte layer and an anode active material layer, and, a current collecting material including a metal current collector and a resin layer; a first pressing step of densifying the layered body by pressing; and a second pressing step of attaching the resin layer to at least either the cathode active material layer or the anode active material layer by placing the layered body upon the current collecting material and applying a heat pressing, after the first pressing step, wherein a press pressure in the second pressing step is smaller than that of the first pressing step.

3 . The method for producing a solid-state battery according to claim 2 , wherein the press pressure (linear pressure) in the first pressing step is 40 kN/cm or more, and the press pressure (linear pressure) in the second pressing step is 5 kN/cm or less.

4 . The method for producing a solid-state battery according to claim 2 , wherein the resin layer contains a thermoplastic resin and a conductive material, and a softening temperature of the thermoplastic resin is 170° C. or less.

5 . The method for producing a solid-state battery according to claim 2 , wherein the layered body comprises:
a cathode current collector; a first cathode active material layer, a first solid electrolyte layer and a first anode active material layer that are laminated in this order from a first surface of the cathode current collector; and a second cathode active material layer, a second solid electrolyte layer and a second anode active material layer that are laminated in this order from a second surface opposed to the first surface of the cathode current collector, wherein the metal current collector in the current collecting material is an anode current collector; and wherein the resin layer is attached to the first anode active material layer and the second anode active material layer in the second pressing step.

Assignees

• Toyota Motor Co Ltd

Inventors

• Masumura Kento
• Kawakami Masatsugu

Classifications

• H01M10/0562

  Solid materials · 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

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title