Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing high-energy-density lithium ion battery negative electrode material based on silicon waste alloy method

A high-energy-density, lithium-ion battery technology with applications in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc.

Inactive Publication Date: 2020-10-20
KUNMING UNIV OF SCI & TECH
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no method of using silicon waste combined with graphene to prepare battery anode materials with high energy density and high specific capacity.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing high-energy-density lithium ion battery negative electrode material based on silicon waste alloy method
  • Method for preparing high-energy-density lithium ion battery negative electrode material based on silicon waste alloy method
  • Method for preparing high-energy-density lithium ion battery negative electrode material based on silicon waste alloy method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: a kind of method based on silicon scrap alloy method to prepare high energy density lithium ion battery negative electrode material, concrete steps are as follows:

[0024] (1) Diamond wire cutting silicon waste is vacuum-dried, naturally cooled and crushed, and ground to obtain waste silicon powder (see figure 1 ), the waste silicon powder is compressed to obtain the waste silicon material;

[0025] (2) Mix the waste silicon material and magnesium particles in step (1) evenly, place the temperature in an argon atmosphere at a constant rate of 5°C / min to a temperature of 1500°C and react at a constant temperature for 180min, cool to room temperature, and Ball milling in the atmosphere for 10 minutes to obtain micro-nano Si@Mg powder; the particle size of the magnesium particles is 5mm, the molar ratio of silicon and magnesium in the waste silicon material is 10:1, and the ball milling rate is 400r / min;

[0026] (3) Add the micro-nano Si@Mg powder in step ...

Embodiment 2

[0028] Embodiment 2: a kind of method based on silicon scrap alloy method to prepare high energy density lithium-ion battery anode material, concrete steps are as follows:

[0029] (1) The silicon waste material cut by diamond wire is vacuum-dried, naturally cooled, crushed, and ground to obtain waste silicon powder, and the waste silicon powder is pressed into tablets to obtain waste silicon material;

[0030] (2) Mix the waste silicon material and aluminum particles in step (1) evenly, place the temperature in an argon atmosphere at a constant rate of 10°C / min to a temperature of 1700°C and react at a constant temperature for 200 minutes, cool to room temperature, and place in an argon atmosphere. Ball milling in the atmosphere for 15 minutes to obtain micro-nano Si@Al powder; the particle size of the aluminum particles is 500 μm, the molar ratio of silicon and aluminum in the waste silicon material is 5:1, and the ball milling rate is 800r / min;

[0031] (3) Add the micro-na...

Embodiment 3

[0033] Embodiment 3: A kind of method based on silicon scrap alloy method to prepare high energy density lithium-ion battery anode material, concrete steps are as follows:

[0034] (1) The silicon waste material cut by diamond wire is vacuum-dried, naturally cooled, crushed, and ground to obtain waste silicon powder, and the waste silicon powder is pressed into tablets to obtain waste silicon material;

[0035] (2) Mix the waste silicon material and copper particles in step (1) evenly, place the temperature in an argon atmosphere at a constant rate of 5°C / min to a temperature of 1455°C and react at a constant temperature for 200min, cool to room temperature, and place in an argon atmosphere. Ball milling in the atmosphere for 30 minutes to obtain micro-nano Si@Cu powder; wherein the particle size of the copper particles is 500nm, the molar ratio of silicon and copper in the waste silicon material is 10:1, and the ball milling rate is 1000r / min;

[0036] (3) Add the micro-nano ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Reversible capacityaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing a high-energy-density lithium ion battery negative electrode material based on a silicon waste alloy method, and belongs to the technical field of new energy materials and electrochemistry. On the basis of an alloy method, diamond wire cutting silicon waste and metal particles are mixed and heated to be in a molten state in a protective atmosphere; the heat is preserved to realize a full alloy state; ball milling is carried out in a protective atmosphere to obtain micro-nano Si@M powder; the micro-nano Si @ M powder is mixed with a graphene oxidesolution, graphene oxide is directly reduced by adopting reducing gas, oxygen-containing functional groups among carbon atom layers are removed effectively, and graphene oxide is reduced into graphene to obtain the graphene-coated Si@M high-performance lithium ion battery negative electrode material Si@M@C. Silicon waste and metal are effectively combined through an alloy method, and the conductivity difference of a silicon material is improved; meanwhile, a compact graphene coating layer is introduced to the Si@M surface of the material, the problem of volume expansion of silicon in the charging and discharging process can be effectively solved, and the material has the beneficial effects of being high in energy density, specific capacity and stability.

Description

technical field [0001] The invention relates to a method for preparing a high-energy-density lithium-ion battery negative electrode material based on a silicon waste alloy method, and belongs to the fields of new energy materials and electrochemical technology. Background technique [0002] At present, the relatively mature Si anode materials are carbon-coated SiO, nano-SiC composite materials, and Si alloys. However, silicon also has disadvantages as an anode material for lithium-ion batteries. Silicon is a semiconductor material with low electrical conductivity. During the electrochemical cycle, the intercalation and extraction of lithium ions will cause the volume of the material to expand and shrink by more than 300%, and the mechanical force generated will gradually pulverize the material, causing the structure to collapse, and eventually lead to the electrode active material and current collector. Detachment, loss of electrical contact, resulting in greatly reduced b...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/38H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCH01M4/386H01M4/626H01M4/625H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 马文会张钊李绍元王雷张嘉昆魏奎先陈正杰谢克强伍继君雷云杨斌戴永年
Owner KUNMING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com