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

Silicon monoxide-graphite composite anode material for lithium ion battery and preparation method thereof

A technology of silicon oxide and negative electrode materials, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of limited expansion of silicon oxide particles, shedding of the coating layer, and poor cycle performance of materials, so as to improve the first-time efficiency , shorten the transmission distance, overcome the effect of low first effect

Inactive Publication Date: 2020-02-21
TIANJIN B&M SCI & TECH
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the existing coated modified materials, the outermost coating layer has a very limited effect on inhibiting the expansion of silicon oxide particles, and the coating layer is easy to fall off from the particle surface after several charge-discharge cycles, resulting in material The cycle performance is very poor, and it does not essentially solve the problem of silicon oxide materials

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
  • Silicon monoxide-graphite composite anode material for lithium ion battery and preparation method thereof
  • Silicon monoxide-graphite composite anode material for lithium ion battery and preparation method thereof
  • Silicon monoxide-graphite composite anode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing a silicon oxide-graphite composite negative electrode material, comprising the following steps:

[0042]1) Mix 120g of silicon oxide raw material with 1kg of absolute ethanol evenly and perform ball milling until the median particle size is 0.5um to obtain silicon oxide slurry 1;

[0043] 2) Mix 1 kg of natural graphite raw material with 2 kg of absolute ethanol evenly and perform ball milling until the median particle size is 1.5 μm to obtain graphite slurry 2;

[0044] 3) Mix silicon oxide slurry 1, graphite slurry 2, 100g medium-temperature coal tar pitch, 20g polyvinylpyrrolidone, and 1g aluminum isopropoxide in a ball mill tank for 4 hours;

[0045] 4) Spray-dry the slurry with an inlet temperature of 150° C. to obtain powder 1;

[0046] 5) The powder 1 was raised to 980° C. at a heating rate of 2° C. / min under a nitrogen atmosphere, and subjected to a constant temperature heat treatment for 2 hours to obtain the spherical silicon oxide-grap...

Embodiment 2

[0066] A method for preparing a spherical silicon oxide-graphite composite negative electrode material, comprising the following steps:

[0067] 1) Mix 90g of silicon oxide raw material with 1kg of absolute ethanol evenly and perform ball milling until the median particle size is 0.5um to obtain silicon oxide slurry 1;

[0068] 2) Mix 1 kg of natural graphite raw material with 2 kg of absolute ethanol evenly and perform ball milling until the median particle size is 1.5 μm to obtain graphite slurry 2;

[0069] 3) Mix silicon oxide slurry 1, graphite slurry 2, 95g medium-temperature coal tar pitch, 20g polyvinylpyrrolidone, and 0.9g aluminum isopropoxide in a ball mill tank for 4 hours;

[0070] 4) Spray-dry the slurry with an inlet temperature of 150° C. to obtain powder 1;

[0071] 5) Put the powder 1 into an appropriate amount of absolute ethanol solution for washing, then pour out the ethanol solution, and then replace it with a new absolute ethanol solution for washing ag...

Embodiment 3

[0074] A method for preparing a spherical silicon oxide-graphite composite negative electrode material, comprising the following steps:

[0075] 1) Mix 120g of silicon oxide raw material with 1kg of absolute ethanol evenly and perform ball milling until the median particle size is 0.5um to obtain silicon oxide slurry 1;

[0076] 2) Mix 1 kg of natural graphite raw material with 2 kg of absolute ethanol evenly and perform ball milling until the median particle size is 1.5 μm to obtain graphite slurry 2;

[0077] 3) Mix silicon oxide slurry 1, graphite slurry 2, 100g medium-temperature coal tar pitch, 20g polyethylene glycol 2000, and 1g aluminum isopropoxide in a ball mill tank for 4 hours;

[0078] 4) Spray-dry the slurry with an inlet temperature of 150° C. to obtain powder 1;

[0079] 5) Put the powder 1 into an appropriate amount of absolute ethanol solution for washing, then pour out the ethanol solution, and then replace it with a new absolute ethanol solution for washin...

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a spherical monoxide-graphite composite anode material for a lithium ion battery and a preparation method thereof. The preparation method comprises the steps of: performing ball-milling treatment of silicon monoxide raw materials and natural graphite raw materials, then performing spray drying of the mixture with asphalt, aluminum isopropoxide and other organic carbon sources, and finally, performing high-temperature disproportionation reaction and carbonization treatment in an inert atmosphere to finally obtain the spherical silicon monoxide-graphite composite anode material coated with amorphous carbon and mutually fused with silicon monoxide particles and the graphite particles. The synthesis process is simple, the process conditions are easy to control, and industrialization is easy to implement; the prepared spherical silicon monoxide-graphite composite anode material is good in circulation and small in expansion coefficient, and can be used as the new generation of the lithium ion power battery anode material.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a silicon oxide-graphite composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] The theoretical capacity of graphite anode material is 372mAh / g, which cannot meet the high energy density requirements of new lithium-ion batteries. Therefore, it is very important to develop new anode materials for high-capacity lithium-ion batteries. [0003] At present, the main technical way to increase the energy density of batteries at home and abroad is to use silicon-carbon anode materials to replace traditional graphite anode materials. Silicon-based materials have the highest theoretical specific capacity (4200mAh / g) among anode materials for lithium-ion batteries, and are currently the best choice for anode materials for high-energy-density lithium-ion batteries. [0004] However, there is a problem of e...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 马倩倩徐宁吕菲宋英杰伏萍萍
Owner TIANJIN B&M 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