Silicon material and method for producing the same

Patent metadata

Field	Value
Publication number	US-2018179072-A1
Application number	US-201615735227-A
Country	US
Kind code	A1
Filing date	May 20, 2016
Priority date	Jun 12, 2015
Publication date	Jun 28, 2018
Grant date	—

Abstract

Provided is a method for producing a silicon material, the method including: a molten metal preparing step of preparing Ca-x at % Si alloy (42≤x≤75) molten metal; a solidifying step of cooling the molten metal by a rapid cooling device to solidify the Ca-x at % Si alloy; a synthesizing step of reacting the solidified Ca-x at % Si alloy with acid to obtain a layered silicon compound; and a heating step of heating the layered silicon compound at not less than 300° C.

First claim

1 - 6 . (canceled)

7 . A method for producing a silicon material, the method comprising:
a molten metal preparing step of preparing Ca-x at % Si alloy (42≤x≤75) molten metal; a solidifying step of cooling the molten metal by a rapid cooling device to solidify the Ca-x at % Si alloy; a synthesizing step of reacting the Ca-x at % Si alloy with acid to obtain a layered silicon compound, the Ca-x at % Si alloy having been solidified without performing grinding by a grinder; and a heating step of heating the layered silicon compound at not less than 300° C.

8 . The method for producing a silicon material according to claim 7 , wherein the rapid cooling device is selected from a cooling device that uses a cooling means of spraying the molten metal on a rotating cooling roll, or a cooling device that uses an atomizing method.

9 . The method for producing a silicon material according to claim 7 , wherein the rapid cooling device is selected from a liquid rapid solidifying device, a rapid cooling thin section producing device, a submerged spinning device, a gas atomizing device, a water atomizing device, a rotary disc device, a rotational electrode method device, or a centrifugal powder producing device.

10 . A method for producing a silicon material, the method comprising:
a preparing step of preparing a Ca-x at % Si alloy (42≤x≤75) containing CaSi 2 crystal particles having a mean diameter of 0.1 to 100 μm, without performing grinding by a grinder; a synthesizing step of reacting the Ca-x at % Si alloy with acid to obtain a layered silicon compound; and a heating step of heating the layered silicon compound at not less than 300° C.

11 . The method for producing a silicon material according to claim 10 , wherein the preparing step is the molten metal preparing step of preparing Ca-x at % Si alloy (42≤x≤75) molten metal and a solidifying step of cooling the molten metal by a rapid cooling device to solidify the Ca-x at % Si alloy.

12 . A method for producing a secondary battery, the method comprising the step of producing a secondary battery using a silicon material that is produced by the method for producing a silicon material according to claim 7 .

Assignees

• Toyota Jidoshokki Kk

Inventors

• Harata Masanori
• Mohri Takashi
• Goda Nobuhiro

Classifications

• C01B33/027 Primary

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

• H01M4/386

  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

• H01G11/30

  characterised by their material · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title