Cathode mixture, cathode, solid battery and method for producing cathode mixture, cathode and solid battery

Patent metadata

Field	Value
Publication number	US-9780360-B2
Application number	US-201514843186-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	Sep 10, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

Provided is a cathode mixture which can have both ion conductivity and electron conductivity and with which a solid battery having an excellent output characteristic can be obtained.
The cathode mixture includes a plurality of cathode active material particles, a fibrous electroconductive material, a particulate electroconductive material, and a solid electrolyte, wherein setting the total number of the plurality of cathode active material particles as 100%, the number of the cathode active material particles in contact with the fibrous electroconductive material via the particulate electroconductive material is 40% or more.

First claim

The invention claimed is:

1. A solid battery comprising:
a solid electrolyte layer;
an anode; and
a cathode that includes a layer formed of a cathode mixture comprising:
a plurality of cathode active material particles;
a fibrous electroconductive material;
a particulate electroconductive material; and
a solid electrolyte,

wherein setting a total number of the plurality of cathode active material particles as 100%, number of the cathode active material particles in contact with the fibrous electroconductive material via the particulate electroconductive material is 40% or more,
wherein setting a total amount of the cathode active material particles, the fibrous electroconductive material, the particulate electroconductive material, and the solid electrolyte as 100 mass %, the fibrous electroconductive material and the particulate electroconductive material are included in an amount of no less than 0.5 mass % and no more than 2.5 mass % in total.

2. The cathode mixture according to claim 1 , wherein setting a total amount of the fibrous electroconductive material and the particulate electroconductive material as 100 mass %, the particulate electroconductive material is included in an amount of no less than 20 mass % and no more than 60 mass % in total.

3. The cathode mixture according to claim 1 , further comprising a binder.

4. A method for producing a solid battery, the solid battery including a solid electrolyte layer, an anode, and a cathode that includes a layer formed of a cathode mixture comprising a plurality of cathode active material particles, a fibrous electroconductive material, a particulate electroconductive material, and a solid electrolyte, the method comprising:
a first step of mixing the fibrous electroconductive material and the particulate electroconductive material to obtain a first mixture;
a second step of mixing the first mixture and the plurality of cathode active material particles to obtain a second mixture; and
a third step of mixing the second mixture and the solid electrolyte to obtain a third mixture,
wherein mixing ratios in the first step and second step are adjusted so that in the second mixture a total number of the plurality of cathode active material particles as 100%, number of the cathode active material particles in contact with the fibrous electroconductive material via the particulate electroconductive material is 40% or more,
wherein mixing ratios in the first step, second step, and third step are adjusted so that in the third mixture a total amount of the cathode active material particles, the fibrous electroconductive material, the particulate electroconductive material, and the solid electrolyte as 100 mass %, the fibrous electroconductive material and the particulate electroconductive material are included in an amount of no less than 0.5 mass % and no more than 2.5 mass % in total.

5. The method according to claim 4 , wherein a mixing ratio in the first step is adjusted so that in the first mixture, the particulate electroconductive material is included in an amount of no less than 20 mass % and no more than 60 mass %, setting a total amount of the fibrous electroconductive material and the particulate electroconductive material as 100 mass %.

6. The method according to claim 4 , further comprising a fourth step of mixing the third mixture and a binder to obtain a fourth mixture.

7. The method according to claim 4 , further comprising a step of forming the cathode mixture from the third mixture.

8. The method according to claim 7 , further comprising a step of laminating the cathode, the solid electrolyte layer, and the anode.

Assignees

• Toyota Motor Co Ltd

Inventors

• Mizutani Satoshi

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M10/0525

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

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/625

  Carbon or graphite · CPC title