Electrode for solid-state batteries and solid-state battery

Patent metadata

Field	Value
Publication number	US-2020036009-A1
Application number	US-201916513806-A
Country	US
Kind code	A1
Filing date	Jul 17, 2019
Priority date	Jul 27, 2018
Publication date	Jan 30, 2020
Grant date	—

Abstract

An electrode for solid-state batteries, comprising a PTC resistor layer, and a solid-state battery comprising the electrode. The electrode may be an electrode for solid-state batteries, wherein the electrode comprises an electrode active material layer, a current collector and a PTC resistor layer which is disposed between the electrode active material layer and the current collector and which is in contact with the electrode active material layer; wherein the PTC resistor layer contains an electroconductive material, an insulating inorganic substance and a polymer.

First claim

1 . An electrode for solid-state batteries,
wherein the electrode comprises an electrode active material layer, a current collector and a PTC resistor layer which is disposed between the electrode active material layer and the current collector and which is in contact with the electrode active material layer; wherein the PTC resistor layer contains an electroconductive material, an insulating inorganic substance and a polymer; and wherein, when the PTC resistor layer is divided into an A layer and a B layer in order from nearest to furthest from the electrode active material layer so that, at any point of the PTC resistor layer, a ratio of a thickness of the A layer to a thickness of the B layer is 1:2 in a thickness direction of the PTC resistor layer, a volume ratio V A of the insulating inorganic substance in the A layer when a total volume of the electroconductive material, the insulating inorganic substance and the polymer in the A layer is determined as 100 volume %, is smaller than a volume ratio V B of the insulating inorganic substance in the B layer when a total volume of the electroconductive material, the insulating inorganic substance and the polymer in the B layer is determined as 100 volume %.

2 . The electrode for solid-state batteries according to claim 1 , wherein a value obtained by dividing the volume ratio V A by the volume ratio V B (V A /V B ) is from 0.08 to 0.5.

3 . The electrode for solid-state batteries according to claim 1 ,
wherein the PTC resistor layer contains a carbon-containing electroconductive material as the electroconductive material and a fluorine-containing polymer as the polymer, and wherein a value obtained by dividing an atomic percentage of carbon atoms contained in the A layer by an atomic percentage of fluorine atoms contained in the A layer, is from 2.4 to 3.9.

4 . The electrode for solid-state batteries according to claim 1 , wherein the insulating inorganic substance is a metal oxide.

5 . The electrode for solid-state batteries according to claim 1 , wherein the electroconductive material is carbon black.

6 . A solid-state battery comprising a cathode, an anode and an electrolyte layer disposed between the cathode and the anode,
wherein at least one of the cathode and the anode is the electrode for solid-state batteries defined by claim 1 .

Assignees

• Toyota Motor Co Ltd

Inventors

• Ose Norihiro
• Suzuki Tomoya
• Hasegawa Hajime
• Yaso Kazuo
• Nishimura Hideaki
• Matsushita Yuki

Classifications

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M4/13 Primary

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

• H01M2200/106

  PTC · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/623 Primary

  fluorinated polymers · CPC title