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

A kind of lithium-ion battery high-capacity silicon oxide composite negative electrode material and preparation method thereof

A silicon oxide and negative electrode material technology, applied in battery electrodes, electrode manufacturing, non-aqueous electrolyte battery electrodes, etc., can solve the problem that the Coulombic efficiency is less than 70%, achieve improved cycle stability, good application prospects, and improve the first effective effect

Active Publication Date: 2022-02-08
郑州中科新兴产业技术研究院 +1
View PDF23 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cycle and conductivity have been improved in this invention patent, the reversible capacity is 650mAh / g, and the first Coulombic efficiency is less than 70%.

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
  • A kind of lithium-ion battery high-capacity silicon oxide composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery high-capacity silicon oxide composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery high-capacity silicon oxide composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of the lithium-ion battery high-capacity silicon oxide composite negative electrode material of this embodiment is as follows:

[0035] (1) Dissolve a certain amount of chitosan in deionized water, stir magnetically for 2 hours, add hydrochloric acid, adjust the pH to 2, continue magnetically stirring for 2 hours, then add silicon oxide according to 10 times the mass of chitosan, and stir magnetically. Slurry A was obtained after ultrasonic and ball milling;

[0036] (2) Spray-drying and calcining the slurry A to obtain a carbon-coated silicon oxide material. The spray-drying conditions are as follows: inlet temperature is 180°C, outlet temperature is 90°C, calcination conditions are protective gas, low temperature 200°C, heat preservation 1h, high temperature 750°C, heat preservation 2.5h, and the heating rate is 5°C / min;

[0037] (3) The above-mentioned carbon-coated silicon oxide material, carbon nanotubes, and lithium carbonate were mixed in ...

Embodiment 2

[0045] The preparation method of the lithium-ion battery high-capacity silicon oxide composite negative electrode material of this embodiment is as follows:

[0046] (1) Dissolve a certain amount of chitosan in deionized water, stir magnetically for 2 hours, add acetic acid to adjust the pH to 3, continue magnetically stirring for 2 hours, then add silicon oxide according to 13 times the mass of chitosan, and stir magnetically. Slurry A was obtained after ultrasonic and ball milling;

[0047] (2) Spray-drying and calcining the slurry A to obtain a carbon-coated silicon oxide material. The spray drying conditions are as follows: inlet temperature is 195°C, outlet temperature is 85°C, calcination conditions are protective gas, low temperature 250°C, heat preservation for 0.5h, high temperature 650°C, heat preservation for 4 hours, and the heating rate is 5°C / min;

[0048] (3) The above-mentioned carbon-coated silicon oxide material, graphene, and lithium hydroxide were mixed in a...

Embodiment 3

[0052] The preparation method of the lithium-ion battery high-capacity silicon oxide composite negative electrode material of this embodiment is as follows:

[0053] (1) Dissolve a certain amount of chitosan in deionized water, stir magnetically for 2 hours, add sulfuric acid, adjust the pH to 4, continue magnetically stirring for 2 hours, then add silicon oxide according to 8 times the mass of chitosan, and stir magnetically. Slurry A was obtained after ultrasonic and ball milling;

[0054] (2) Spray-drying and calcining the slurry A to obtain a carbon-coated silicon oxide material. The spray drying conditions are as follows: inlet temperature is 190°C, outlet temperature is 95°C, calcination conditions are protective gas, low temperature 150°C, heat preservation for 2 hours, high temperature 800°C, heat preservation for 2.5 hours, and the heating rate is 5°C / min;

[0055] (3) Mix the above-mentioned carbon-coated silicon oxide material, carbon nanofibers, and lithium oxide ...

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
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a high-capacity silicon oxide composite negative electrode material for a lithium ion battery and a preparation method thereof. The high-capacity silicon oxide composite negative electrode material is a multi-layer composite network cross-linked structure, the innermost layer is silicon oxide SiOx, the middle layer is coated carbon, and the outer layer is lithium salt pre-lithiated by chemical additives. The structural particles are connected to each other by the conductive network formed by conductive carbon. The invention improves the structural stability of the material and enhances the reaction kinetics process through the electrostatic adsorption coating effect of the protonated carbon source, the pre-lithiation treatment process of the material and the internal structure of the conductive network of the material. Secondary granulation is achieved by means of spray drying and solid-liquid phase high-energy mixing to construct a silicon-carbon composite negative electrode material with a multi-layer composite network cross-linked structure. The high-capacity silicon oxide composite negative electrode material provided by the invention has narrow particle size distribution, high conductivity, high coulombic efficiency, low expansion, high cycle retention rate, etc., simple preparation process, and easy industrial production.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a high-capacity silicon oxide composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Due to the rapid development and wide application of various portable electronic devices, electric vehicles, and energy storage systems in recent years, the demand for lithium-ion batteries with high energy density and long cycle life has become increasingly urgent. At present, the negative electrode material of commercial lithium-ion batteries is mainly graphite, but due to the low theoretical specific capacity, the further improvement of the energy density of lithium-ion batteries is limited. At present, silicon-based anode materials are considered to be a very effective material for increasing the energy density of lithium-ion batteries, and their theoretical spec...

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 Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/13H01M4/04
CPCH01M4/366H01M4/483H01M4/625H01M4/13H01M4/0471H01M2004/027H01M2004/021Y02E60/10
Inventor 刘艳侠阮晶晶万爽刘凡柴丰涛张锁江
Owner 郑州中科新兴产业技术研究院
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