High-performance anodes for lithium ion batteries

Patent metadata

Field	Value
Publication number	US-11926680-B2
Application number	US-202017060187-A
Country	US
Kind code	B2
Filing date	Oct 1, 2020
Priority date	Oct 2, 2019
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

This invention provides a method whereby Si microparticles (“Si MP”) with low cost and nitrogen-abundant chitin fibers from crustacean shells are used as raw materials to produce Si nanoparticles and nitrogen doped carbon composite via a scalable ball milling method. During the ball-milling process, Si MP are downsized, and the chitin fibers are wrapped around the particles. The milled product is then post-thermally treated to obtain Si and nitrogen doped carbon composites.

First claim

The invention claimed is:

1. A method for making a nitrogen doped carbon composite comprising:
grinding an exoskeleton from a crawfish to make a crawfish powder;
washing the crawfish powder with an acid to reduce a mineral content of the crawfish powder;
washing the demineralized crawfish powder with a base to reduce a protein content of the crawfish powder;
contacting the crawfish powder and silicon microparticles to make a mixture;
grinding the mixture to reduce a size of the silicon microparticles to silicon nanoparticles to make a first composite;
carbonizing the first composite to make a nitrogen doped carbon composite, wherein the nitrogen doped carbon composite comprises silicon nanoparticles.

2. The method of claim 1 wherein the acid is hydrochloric acid.

3. The method of claim 1 wherein the base is potassium hydroxide.

4. The method of claim 1 further comprising the step of removing the pigment of said first composite.

Assignees

• Univ Louisiana At Lafayette

Inventors

• Fei Ling

Classifications

• C08B37/003 Primary

  Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof · CPC title

• C08J3/12

  Powdering or granulating · CPC title

• C08J7/04

  Coating · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/608

  containing heterocyclic rings · CPC title