# US 10,308,515 B2 · Method for producing CaSi2-containing composition and silicon material

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- Number: US 10,308,515 B2
- Document ID: US10308515B2
- Status: Granted
- Kind: B2
- Application number: 15/735,281
- Filed: 2016-05-20
- Published: 2018-06-21
- Granted: 2019-06-04
- Earliest claimed: 2015-06-12
- Assignees: Kabushiki Kaisha Toyota Jidoshokki
- Applicants: Kabushiki Kaisha Toyota Jidoshokki
- Inventors: Masanori Harata; Nobuhiro Goda; Takashi Mohri; Hiroki Oshima
- Web page: https://patentgrep.com/patent/US10308515B2

## CPC

- C01B 33/06: Metal silicides (alloys C22)
- C08L 27/04: containing chlorine atoms
- C08L 27/12: containing fluorine atoms
- H01M 4/381: {Alkaline or alkaline earth metals elements (H01M4/40 takes precedence)}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/625: {Carbon or graphite}
- H01M 10/052: Li-accumulators
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2004/03: obtained by SEM
- C08L 2203/20: use in electrical or conductive gadgets
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a method for producing a CaSi2-containing composition, the method including: a molten metal step of adding Ca and/or M (M is at least one element selected from elements of groups 3 to 9) to a CaSi2-containing composition containing crystalline silicon to prepare a molten metal containing Ca, M and Si that satisfy the following condition: when a molar ratio of Ca, M and Si is x:y:z (x+y+z=100), x, y and z satisfy 23<x≤100/3, 0<y<10 and 64<z≤200/3, respectively; and a cooling step of cooling the molten metal to obtain a CaSi2-containing composition containing a reduced amount of crystalline silicon.

## Claims

### Claim 1

A method for producing a CaSi2-containing composition, the method comprising:
a molten metal step of adding Ca and/or M (M is at least one element selected from elements of groups 3 to 9) to a CaSi2-containing composition containing crystalline silicon as an impurity to prepare a molten metal containing Ca, M and Si that satisfy the following condition:
when a molar ratio of Ca, M and Si is x:y:z (x+y+z=100), x, y and z satisfy 23<x≤100/3, 0<y<10 and 64<z≤200/3, respectively; and
a cooling step of cooling the molten metal to obtain the CaSi2-containing composition containing a reduced amount of crystalline silicon.

### Claim 2 (depends on 1)

A method for producing a silicon material, the method comprising:
a step of reacting the CaSi2-containing composition produced by the production method according to claim 1, with acid to obtain a layered silicon compound; and
a heating step of heating the layered silicon compound at not less than 300° C.

### Claim 3 (depends on 2)

A method for producing a secondary battery, the method comprising a secondary battery producing step using the silicon material produced by the production method according to claim 2.

### Claim 4 (depends on 1)

A method for producing a silicon material, the method comprising:
a step of mixing the CaSi2-containing composition produced by the production method according to claim 1 and a halogen-containing polymer, and heating the mixture at a temperature not less than a carbonization temperature of the halogen-containing polymer.