Active material, anode layer, battery, and methods for producing these

Patent metadata

Field	Value
Publication number	US-12300812-B2
Application number	US-202318370967-A
Country	US
Kind code	B2
Filing date	Sep 21, 2023
Priority date	Mar 27, 2020
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, including a void inside a primary particle, and a void amount of the void with a fine pore diameter of 100 nm or less is 0.05 cc/g or more and 0.15 cc/g or less.

First claim

The invention claimed is:

1. A method for producing an active material, the method comprising:
a preparing step of preparing an intermediate including a silicon clathrate II type crystal phase,
an alloying step of obtaining an alloy compound by alloying the intermediate and a Li based material so as a molar ratio (Li/Si) of Li included in the Li based material to Si included in the intermediate is 3 or less, and
a Li removing step of removing the Li from the alloy compound and forming a void inside a primary particle,
wherein the Li/Si is 0.5 or more.

2. The method for producing an active material according to claim 1 , wherein, in the Li removing step, the Li is removed from the alloy compound using an ethanol.

3. A method for producing an anode layer, the method comprising:
an active material producing step of producing an active material by the method for producing an active material according to claim 1 , and
an anode layer forming step of forming an anode layer using the active material.

4. A method for producing a battery, the method comprising:
an active material producing step of producing an active material by the method for producing an active material according to claim 1 , and
an anode layer forming step of forming an anode layer using the active material.

Assignees

• Toyota Motor Co Ltd

Inventors

• Otaki Mitsutoshi
• Yoshida Jun
• Suzuki Kazuhiro
• Harata Masanori

Classifications

• H01B1/04

  mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H01M10/0525

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

• H01M4/366

  as layered products · CPC title

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title