Electrode mixture, battery, and method for producing electrode

Patent metadata

Field	Value
Publication number	US-11876216-B2
Application number	US-202217744202-A
Country	US
Kind code	B2
Filing date	May 13, 2022
Priority date	Jan 31, 2018
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

An electrode mixture includes a sulfide solid electrolyte and a carbon-containing material having contact with the sulfide solid electrolyte. An intensity ratio C/S determined from a spectrum obtained by analyzing the electrode mixture by Auger electron spectroscopy satisfies 0.2≤C/S≤1, where C is an intensity of a peak in the spectrum which corresponds to carbon included in the carbon-containing material, and S is an intensity of a peak in the spectrum which corresponds to sulfur included in the sulfide solid electrolyte.

First claim

What is claimed is:

1. A method for producing an electrode, the method comprising:
preparing a slurry including a sulfide solid electrolyte, an electrode active material, a carbon-containing material, and a solvent, by
stirring a first mixture including the sulfide solid electrolyte, the carbon-containing material, and the solvent, using an ultrasound homogenizer,
adding the electrode active material to the first mixture to prepare a second mixture, and
stirring the second mixture;

applying the slurry to a current collector to form a coating film on the current collector; and
removing the solvent from the coating film to form an electrode mixture layer,
[wherein the slurry is prepared by stirring a first mixture including the sulfide solid electrolyte, the carbon-containing material, and the solvent, using an ultrasound homogenizer, adding the electrode active material to the first mixture to prepare a second mixture, and stirring the second mixture,] and
wherein an intensity ratio C/S determined from a spectrum obtained by analyzing the electrode mixture layered by Auger electron spectroscopy satisfies 0.2≤C/S≤1, where C is an intensity of a first peak in the spectrum, the first peak corresponding to carbon included in the carbon-containing material, and S is an intensity of a second peak in the spectrum, the second peak corresponding to sulfur including in the sulfide solid electrolyte.

2. The method for producing an electrode according to claim 1 ,
wherein the stirring the second mixture is performed by using a ball mill, a rotary mixer, a double-arm mixer, a kneader or an ultrasound homogenizer.

3. The method for producing an electrode according to claim 1 ,
a mass of the carbon-containing material is from 0.01% to 5% of a total mass of the electrode active material and the sulfide solid electrolyte.

4. The method for producing an electrode according to claim 1 ,
a thin film composed of the carbon-containing material covers at least a part of a surface of the sulfide solid electrolyte, a thickness of the thin film composed of the carbon-containing material is on the order of nanometers.

5. The method for producing an electrode according to claim 1 , wherein the carbon-containing material includes one or more of a thermoplastic resin, a thermosetting resin, carboxymethyl cellulose, ethyl cellulose or a cellulose nanofiber derivative.

6. The method for producing an electrode according to claim 1 , wherein the carbon-containing material includes an acid-modified styrene-ethylene-butadiene-styrene resin.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Sugawara Ryo
• Kouzaki Takashi

Classifications

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• H01M4/0409

  by a doctor blade method, slip-casting or roller coating · CPC title

• H01M4/13

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

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title