ELECTRODE ACTIVE MATERIAL Si PARTICLES, ELECTRODE COMPOUND MATERIAL, LITHIUM-ION BATTERY AND METHOD FOR PRODUCING ELECTRODE ACTIVE MATERIAL Si PARTICLES

Patent metadata

Field	Value
Publication number	US-2024030422-A1
Application number	US-202318352665-A
Country	US
Kind code	A1
Filing date	Jul 14, 2023
Priority date	Jul 20, 2022
Publication date	Jan 25, 2024
Grant date	—

Abstract

The main object of the disclosure is to provide electrode active material Si particles that can inhibit fluctuation in constraining pressure of a battery during charge-discharge. The electrode active material Si particles have clathrate-type Si and diamond-type Si in the same particles. The electrode active material Si particles preferably comprise diamond-type Si at an area % of 0.05 to 11.00 with respect to the entire electrode active material Si particles. Preferably, the clathrate-type Si at least partially has a clathrate type II structure. The electrode active material Si particles preferably have a porous structure.

First claim

1 . Electrode active material Si particles having clathrate-type Si and diamond-type Si in the same particles.

2 . The electrode active material Si particles according to claim 1 , which comprise diamond-type Si at an area % of 0.05 to 11.00 with respect to the entire electrode active material Si particles.

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

4 . The electrode active material Si particles according to claim 1 , which have a porous structure.

5 . An electrode compound material comprising electrode active material Si particles according to claim 1 .

6 . A lithium-ion battery having a negative electrode layer comprising an electrode compound material according to claim 5 , an electrolyte layer and a positive electrode layer, in that order.

7 . The lithium-ion battery according to claim 6 , wherein the separator layer is a solid electrolyte layer.

8 . A method for producing electrode active material Si particles, which comprises:
mixing NaSi alloy powder and a Na trap agent and heating them at a heating temperature of 250 to 500° C. for a heating time of 30 to 200 hours, to obtain Si particles having a clathrate structure.

9 . The method according to claim 8 , wherein the mean particle diameter (D50) of the Na trap agent is 60 to 80 μm.

10 . The method according to claim 8 , which includes mechanically milling Si powder and NaH powder and heating them at a heating temperature of 250 to 350° C. for a heating time of 1 to 20 hours, or at a heating temperature of 400 to 800° C. for a heating time of 30 to 100 hours, to obtain the NaSi alloy powder.

Assignees

• Toyota Motor Co Ltd

Inventors

• Mashimo Naohiro
• Otaki Mitsutoshi
• Yoshida Jun
• Harata Masanori
• Yamaguchi Yasuhiro
• Urabe Kota
• Eguchi Tatsuya

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

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• C01B33/027 Primary

  by decomposition or reduction of gaseous or vaporised silicon compounds other than silica or silica-containing material · CPC title

• H01M2004/021

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