Negative electrode body, lithium ion battery, and method of producing active material for lithium ion battery

Patent metadata

Field	Value
Publication number	US-2024014388-A1
Application number	US-202318219363-A
Country	US
Kind code	A1
Filing date	Jul 7, 2023
Priority date	Jul 8, 2022
Publication date	Jan 11, 2024
Grant date	—

Abstract

A negative electrode body of the present disclosure is a negative electrode body for a lithium ion battery having a negative electrode current collector layer and a negative electrode active material layer, wherein the negative electrode active material layer contains Si particles having a clathrate type structure as a negative electrode active material, wherein the negative electrode active material layer contains 0.850 mass % to 5.000 mass % of Al with respect to a mass of the negative electrode active material layer, and wherein the Si particles contain 0.040 mass % to 0.250 mass % of Al with respect to a mass of the Si particles.

First claim

What is claimed is:

1 . A negative electrode body for a lithium ion battery having a negative electrode current collector layer and a negative electrode active material layer,
wherein the negative electrode active material layer contains Si particles having a clathrate type structure as a negative electrode active material, wherein the negative electrode active material layer contains 0.850 mass % to 5.000 mass % of Al with respect to a mass of the negative electrode active material layer, and wherein the Si particles contain 0.040 mass % to 0.250 mass % of Al with respect to a mass of the Si particles.

2 . The negative electrode body according to claim 1 ,
wherein the negative electrode body contains 1.500 mass % or more of Al with respect to a total mass of the negative electrode active material layer, and wherein the Si particles contain 0.080 mass % or more of Al with respect to a mass of the Si particles.

3 . The negative electrode body according to claim 1 ,
wherein the negative electrode active material layer contains Al-containing particles that are electrochemically inactive under a working voltage of a lithium ion battery.

4 . The negative electrode body according to claim 3 ,
wherein the Al-containing particles contain F or O.

5 . The negative electrode body according to claim 3 ,
wherein the Al-containing particles are AlF 3 or Al 2 O 3 .

6 . The negative electrode body according to claim 1 ,
wherein the Si particles have a porous structure.

7 . The negative electrode body according to claim 1 ,
wherein the Si particles have a clathrate type II structure.

8 . A lithium ion battery in which the negative electrode body according to claim 7 , a solid electrolyte layer, and a positive electrode body are laminated in this order.

9 . A method of producing an active material for a lithium ion battery, comprising:
mixing and heating a NaSi alloy and AlF 3 to obtain a mixture containing Si particles having a clathrate type structure, NaF, and Al-containing particles; and washing the mixture with an aqueous HNO 3 solution, and then performing filtering and drying.

10 . The production method according to claim 9 , comprising
mechanically milling a Si powder and a NaH powder and then heating to obtain the NaSi alloy.

Assignees

• Toyota Motor Co Ltd

Inventors

• Otaki Mitsutoshi
• Yoshida Jun
• Nakanishi Shinji
• Yamaguchi Yasuhiro
• Eguchi Tatsuya
• Harata Masanori
• Urabe Kota
• Niimi Tomohiro
• Yukawa Kayoko

Classifications

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/582

  Halogenides · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M10/0525

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