JPWO2019161288A5

JPWO2019161288A5 -

Info

Publication number: JPWO2019161288A5
Application number: JP2020543643A
Authority: JP
Publication date: 2022-02-21
Anticipated expiration: 2039-02-15

Claims

A method for producing silicon-carbon nanocomposites,
Preparing silicon nanoparticles coated with silicon oxide (hereinafter referred to as silicon oxide-coated silicon nanoparticles);
Forming silicon oxide-coated silicon nanoparticles coated with carbon material, where the carbon material thickness is 0.3-20 nm;
Forming a cluster of silicon oxide-coated silicon nanoparticles coated with a carbon material; and removing all or substantially all silicon oxide from the cluster of silicon oxide-coated silicon nanoparticles coated with a carbon material. A method comprising forming a silicon-carbon nanocomposite material.

The first aspect of claim 1, further comprising isolating the silicon-carbon nanocomposite and / or cleaning the silicon-carbon nanocomposite and / or drying the silicon-carbon nanocomposite. the method of.

The method of claim 1, further comprising lithium-forming the silicon-carbon nanocomposite.

The method of claim 1, wherein the silicon oxide-coated silicon nanoparticles coated with a carbon material are sintered while forming clusters of silicon oxide-coated silicon nanoparticles coated with a carbon material.

The method of claim 1, wherein the conductive carbon material is added to the silicon oxide-coated silicon nanoparticles coated with the carbon material before forming clusters of silicon oxide-coated silicon nanoparticles.

The method of claim 1, wherein the silicon nanoparticles of the silicon-carbon nanocomposite are crystalline, polycrystalline, amorphous, or a combination thereof, and / or have a maximum dimension of 5 to 150 nm.

The method according to claim 1, wherein the silicon nanoparticles are spherical, pseudo-spherical, irregularly shaped, or a combination thereof.

The forming process uses a die set and a hydraulic press to apply pressure to the carbon material-coated silicon oxide-coated silicon nanoparticles to compress clusters of carbon material-coated silicon oxide-coated silicon nanoparticles. The first aspect of the present invention comprises forming a cluster of silicon oxide-coated silicon nanoparticles by grinding compressed clusters of silicon oxide-coated silicon nanoparticles coated with a carbon material. Method.

Silicon Oxide Coated with Carbon Material-Oxidation Coated with Carbon Material After Pressure on Coated Silicon Nanoparticles and Before Crushing Compressed Carbon Material-Silicon Coated Silicon Oxide-Coated Silicon Nanoparticles The method of claim 8, wherein the silicon-coated silicon nanoparticles are sintered.

The method of claim 1, wherein the formation of carbon material coated clusters of silicon oxide-coated silicon nanoparticles is performed using chemical vapor deposition.

The method of claim 1, further comprising one or more additional carbon coating steps.

A method for producing silicon-carbon nanocomposites,
Forming silicon nanoparticles coated with carbon material;
Optionally, include performing one or more carbon coating steps and removing at least a portion of the silicon from the silicon nanoparticles coated with the carbon material to form a silicon-carbon nanocomposite. Method.

12. The method of claim 12, wherein the silicon nanoparticles of the silicon-carbon nanocomposite are crystalline, polycrystalline, amorphous, or a combination thereof, and / or have a maximum dimension of 5 to 250 nm.

12. The method of claim 12, wherein the silicon nanoparticles are spherical, pseudo-spherical, irregularly shaped, or a combination thereof.

25. The method of claim 12, wherein the formation of carbon material coated clusters of silicon oxide-coated silicon nanoparticles is performed using chemical vapor deposition.

12. The method of claim 12, wherein the silicon oxide-coated silicon nanoparticles coated with a carbon material are sintered.

Silicon nanoparticles;
A silicon-carbon nanocomposite material in which silicon nanoparticles are encapsulated in a continuous carbon shell, including a continuous carbon shell; and interstitial spaces within the carbon shell.

The silicon-carbon nanocomposite contains multiple particles, each particle
Silicon nanoparticles;
17. The silicon-carbon nanocomposite of claim 17, wherein the silicon nanoparticles are encapsulated in a continuous carbon shell, including a continuous carbon shell; and interstitial spaces within the carbon shell.

The silicon-carbon nanocomposite has at least 75% by weight of silicon based on the total weight of the silicon-carbon nanocomposite, and / or the silicon nanoparticles of the silicon-carbon nanocomposite are 5 to 150 nm. The silicon-carbon nanocomposite of claim 18, which has the longest dimensions.

17. The silicon-carbon nanocomposite of claim 17, wherein the continuous carbon shell has a thickness of 0.3-20 nm.

17. The silicon-carbon nanocomposite of claim 17, wherein the continuous carbon shell is not 100% amorphous and / or defect-free graphene.

17. The silicon-carbon nanocomposite of claim 17, wherein the continuous carbon shell comprises a carbon material exhibiting a Raman spectrum with a D (sp ³ carbon) / G (sp ² carbon) ratio of 0.7-2.

22. The silicon-carbon nanocomposite of claim 22, wherein the continuous carbon shell comprises a carbon material exhibiting a Raman spectrum that also exhibits an observable G'peak and a G'/ G ratio of 0.1-0.7. ..

The silicon-carbon material according to claim 17, wherein the volume ratio of the gap space to the volume of silicon nanoparticles ([gap volume + volume of silicon nanoparticles] / volume of silicon) is 3 to 5.

An anode for an ion conductive battery comprising the silicon nanocomposite of claim 17.

25. The anode according to claim 25, further comprising one or more binders and / or one or more carbon additives.

The anode has an anode capacity of at least 1,000 mAh / g at a current of 3,500 mA / g for at least 1,000 cycles, or at least 50 cycles or at least 250 cycles at a current of 400 mA / g. 25. The anode according to claim 25, which exhibits an anode capacity of 2,000 mAh / g.

Ionic conductivity comprising the silicon nanocomposite of claim 17, and optionally one or more electrolytes and / or one or more current collectors and / or one or more additional components. battery.

1 to 500 cells, each cell having one or more anodes according to claim 25, and optionally one or more cathodes, one or more electrolytes, and one or more current collectors. Includes an ion conductive battery.