MSix-containing silicon material (M is at least one element selected from group 3 to 9 elements. ⅓<=x<=3) and method for producing same

Patent metadata

Field	Value
Publication number	US-10135067-B2
Application number	US-201515511746-A
Country	US
Kind code	B2
Filing date	Sep 4, 2015
Priority date	Sep 19, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

An MSix-containing silicon material contains MSix (M is at least one element selected from the group 3 to 9 elements. 1/3≤x≤3) in a silicon matrix.

First claim

The invention claimed is:

1. A method for producing an MSix-containing silicon material containing MSix in a silicon matrix, the method comprising:
a molten metal step of heating Ca, M (M is at least one element selected from the group 3 to 9 elements), and Si to form a molten metal;
a step of cooling the molten metal to obtain an MSix-containing calcium silicide containing MSix (1/3≤x≤3) in a calcium silicide matrix;
a step of reacting the MSix-containing calcium silicide with an acid to obtain an MSix-containing polysilane containing the MSix in a polysilane matrix; and
a heating step of heating the MSix-containing polysilane at 300° C. or higher.

2. A method for producing an MSix-containing silicon material containing MSix in a silicon matrix, the method comprising:
a melting step of heating and melting CaSi 2 containing M (M is at least one element selected from the group 3 to 9 elements);
a step of adding Ca to the molten CaSi 2 to obtain a molten metal;
a step of cooling the molten metal to obtain an MSix-containing calcium silicide containing MSix (1/3≤x≤3) in a calcium silicide matrix;
a step of reacting the MSix-containing calcium silicide with an acid to obtain an MSix-containing polysilane containing the MSix in a polysilane matrix; and
a heating step of heating the MSix-containing polysilane at 300° C. or higher.

3. A method for producing an MSix-containing silicon material containing MSix in a silicon matrix, the method comprising:
a step of cooling a molten metal containing Ca, M (M is at least one element selected from the group 3 to 9 elements), and Si to obtain an MSix-containing calcium silicide containing MSix (1/3≤x≤3) in a calcium silicide matrix;
a step of reacting the MSix-containing calcium silicide with an acid to obtain an MSix-containing polysilane containing the MSix in a polysilane matrix; and
a heating step of heating the MSix-containing polysilane at 300° C. or higher.

4. The method for producing the MSix-containing silicon material according to claim 1 , wherein the MSix is FeSi and/or FeSi 2 .

5. An MSix-containing silicon material containing MSix (M is at least one element selected from the group 3 to 9 elements, 1/3≤x≤3) in a silicon matrix, the MSix-containing silicon material being articles each having a structure in which a plurality of plate-like silicon bodies are laminated in a thickness direction, wherein the MSix-containing silicon material contains a fiber body including the MSix.

6. The MSix-containing silicon material according to claim 5 , wherein the fiber body is located over a plurality of layers in each of the particles.

7. An MSix-containing silicon material containing MSix (M is at least one element selected from the group 3 to 9 elements, 1/3≤x≤3) in a silicon matrix, the MSix-containing silicon material being particles each having a structure in which a plurality of plate-like silicon bodies are laminated in a thickness direction, wherein the MSix is fibrous and located over a plurality of layers in each of the particles.

8. The MSix-containing silicon material according to claim 5 , wherein the MSix is FeSi and/or FeSi 2 , or TiSi 2 .

9. A lithium ion secondary battery including the MSix-containing silicon material according to claim 5 as a negative electrode active material.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Harata Masanori

Classifications

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• C01B33/04

  Hydrides of silicon · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• C01B33/06

  Metal silicides (alloys C22) · CPC title

• C01B33/021 Primary

  Preparation (chemical coating from the vapour phase C23C16/00) · CPC title