Method for producing silicon nanowires

Patent metadata

Field	Value
Publication number	US-10676818-B2
Application number	US-201515316913-A
Country	US
Kind code	B2
Filing date	Jun 12, 2015
Priority date	Jun 13, 2014
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A method for producing a material based on silicon nanowires is provided. The method includes the steps of: i) bringing into contact, in an inert atmosphere, a sacrificial support based on a halogenide, a carbonate, a sulfate or a nitrate of an alkali metal, an alkaline earth metal or a transition metal having metal nanoparticles, with the pyrolysis vapours of a silicon source having a silane compound, by which silicon nanowires are deposited on the sacrificial support; and optionally ii) eliminating the sacrificial support and recovering the silicon nanowires produced in step ii).

First claim

The invention claimed is:

1. A process for the preparation of a material based on silicon nanowires, comprising the stages of:
i) bringing a sacrificial support based on an alkali metal or alkaline earth metal halide, carbonate, sulfate or nitrate, comprising metal nanoparticles, into contact, under an inert atmosphere, with the pyrolysis vapors from a silicon source comprising a silane compound, whereby silicon nanowires deposited on the sacrificial support are obtained, the sacrificial support being obtained by mixing alkali metal or alkaline earth metal halide, carbonate, sulfate, or nitrate particles in an anhydrous nonpolar solvent, with the metal nanoparticles; and optionally
ii) removing the sacrificial support and recovering the silicon nanowires obtained in stage i).

2. The process as claimed in claim 1 , in which the sacrificial support is based on sodium chloride.

3. The process as claimed in claim 1 , in which stage ii) comprises a stage of washing with water the silicon nanowires deposited on the sacrificial support.

4. The process as claimed in claim 1 , in which stage i) is carried out in the presence of a doping agent.

5. The process as claimed in claim 4 , in which the doping agent is chosen from organophosphines, organoarsines, organoboranes and aromatic amines.

6. The process as claimed in claim 1 , in which the sacrificial support is a powder of an alkali metal or alkaline earth metal halide, carbonate, sulfate or nitrate, the diameter of the particles which is between 10 nm and 50 μm.

7. The process as claimed in claim 1 , in which the silicon nanowires resulting from stages i) or ii) are deposited on a support which is a conductor or semiconductor.

Assignees

• Commissariat Energie Atomique

Inventors

• Chenevier Pascale
• Reiss Peter
• Burchak Olga

Classifications

• H01M10/0525

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

• C01B33/027 Primary

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

• C01P2006/40

  Electric properties · CPC title

• C23C16/24 Primary

  Deposition of silicon only · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title