Negative electrode active material, negative electrode active material layer and lithium-ion battery, and method for producing negative electrode active material

Patent metadata

Field	Value
Publication number	US-2024021805-A1
Application number	US-202318351162-A
Country	US
Kind code	A1
Filing date	Jul 12, 2023
Priority date	Jul 15, 2022
Publication date	Jan 18, 2024
Grant date	—

Abstract

The present disclosure provides primarily a negative electrode active material with reduced volume change during charge-discharge. The negative electrode active material of the disclosure consists of clathrate-type Si particles comprising one or more metals selected from the group consisting of Mo, Fe, Zn, Mg, Pd, Zr, Ag, Co, Cr, Nb and V. A negative electrode active material layer according to the disclosure comprises the negative electrode active material of the disclosure, and a lithium-ion battery of the disclosure comprises the negative electrode active material layer of the disclosure.

First claim

1 . A negative electrode active material consisting of clathrate-type Si particles comprising one or more metals selected from the group consisting of Mo, Fe, Zn, Mg, Pd, Zr, Ag, Co, Cr, Nb and V.

2 . The negative electrode active material according to claim 1 , wherein the content of the metal with respect to the entire clathrate-type Si particles is 0.01 to 1.60 mass %.

3 . The negative electrode active material according to claim 1 , wherein the metal is interstitially doped in the clathrate-type Si particles.

4 . The negative electrode active material according to claim 1 , wherein the clathrate-type Si particles at least partially have a clathrate type II structure.

5 . The negative electrode active material according to claim 1 , which is for a lithium-ion battery.

6 . A negative electrode active material layer comprising a negative electrode active material according to claim 1 .

7 . A lithium-ion battery having a negative electrode collector layer, a negative electrode active material layer according to claim 6 , a solid electrolyte layer, a positive electrode active material layer and a positive electrode collector layer, in that order.

8 . A method for producing a negative electrode active material, wherein the method includes:
supplying a mixture of NaSi alloy powder, a Na trap agent, and one or more metals selected from the group consisting of Mo, Fe, Zn, Mg, Pd, Zr, Ag, Co, Cr, Nb and V, and heating the mixture at a heating temperature of 250 to 500° C. for a heating time of 30 to 200 hours.

9 . The production method according to claim 8 , which further includes mechanically milling a Si source, a NaH source and the metal, and heating them to obtain a mixture of the NaSi alloy powder and the metal.

Assignees

• Toyota Motor Co Ltd

Inventors

• Otaki Mitsutoshi
• Yoshida Jun
• Nakanishi Shinji
• Yamasaki Hisatsugu
• Kikuchi Natsuki
• Yamaguchi Yasuhiro
• Eguchi Tatsuya
• Harata Masanori
• Urabe Kota

Classifications

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• H01M10/0525

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

• H01M4/0409 Primary

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

• H01M2004/027

  Negative electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title