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

Silicon-based negative electrode material and preparation method and application thereof

A technology of silicon-based negative electrode materials and silicon materials, which is applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low initial charge and discharge efficiency of lithium-ion batteries, poor cycle performance, and volume changes of silicon materials, etc. Effects of initial charge and discharge efficiency, buffering stress, and improving cycle performance

Inactive Publication Date: 2020-11-06
ZHUHAI COSMX BATTERY CO LTD
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a silicon-based negative electrode material and a preparation method thereof, which are used to solve the problems of low initial charge and discharge efficiency and poor cycle performance of lithium-ion batteries caused by volume changes of silicon 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-based negative electrode material and preparation method and application thereof
  • Silicon-based negative electrode material and preparation method and application thereof
  • Silicon-based negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The silicon-based negative electrode material provided in this example includes silicon oxide and a polymer coated on the surface of silicon oxide, wherein the silicon oxide is in the form of irregular particles, and its Dv50 is 20 μm; the polymer has the structure shown in formula 1 , the average degree of polymerization n is 1000, R 1 and R 2 Both are -Cl, and the mass of the polymer is 0.01% of the total mass of the silicon-based negative electrode material.

[0037] The preparation method of the silicon-based negative electrode material provided in this embodiment includes:

[0038] Dissolve 0.02 parts by mass of hexachlorocyclotriphosphazene and 100 parts by mass of silicon oxide in 200 parts by mass of toluene, fully stir with a mechanical stirrer for 4 hours and mix evenly. 10 Pa) and heated for 48 hours. After the reaction, the obtained material was washed with toluene, filtered to remove the solvent, and dried at 150° C. to obtain a silicon-based negative ele...

Embodiment 2

[0042] The silicon-based negative electrode material provided in this example includes silicon oxide and a polymer coated on the surface of silicon oxide, wherein the silicon oxide is in the form of irregular particles, and its Dv50 is 20 μm; the polymer has the structure shown in formula 1 , the average degree of polymerization n is 1000, R 1 and R 2 Both are -Cl, and the mass of the polymer is 0.11% of the total mass of the silicon-based negative electrode material.

[0043] The preparation method of the silicon-based negative electrode material and the negative electrode sheet provided in this example may refer to Example 1, except that the mass fraction of hexachlorocyclotriphosphazene is 0.21.

Embodiment 3

[0045] The silicon-based negative electrode material provided in this example includes silicon oxide and a polymer coated on the surface of silicon oxide, wherein the silicon oxide is in the form of irregular particles, and its Dv50 is 20 μm; the polymer has the structure shown in formula 1 , the average degree of polymerization n is 1000, R 1 and R 2 Both are -Cl, and the mass of the polymer is 1.31% of the total mass of the silicon-based negative electrode material.

[0046] The preparation method of the silicon-based negative electrode material and the negative electrode sheet provided in this example can refer to Example 1, except that the mass fraction of hexachlorocyclotriphosphazene is 2.01.

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
particle sizeaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a silicon-based negative electrode material as well as a preparation method and application thereof. A first aspect of the invention provides a silicon-based negative electrodematerial. The silicon-based negative electrode material comprises a silicon material and a polymer coating the surface of the silicon material. The polymer coating the surface of the silicon materialcan well conduct lithium ions, so that the defect of low initial charge-discharge efficiency of the silicon material is overcome; meanwhile, the polyphosphazene polymer has high elasticity, so that the stress caused by volume change of the silicon material can be well buffered, the SEI film is prevented from being broken, and the cycle performance of the lithium ion battery is improved; besides, the polyphosphazene polymer also has a certain flame retardant property, so that the safety performance of the lithium ion battery can be effectively improved, and therefore, the silicon-based negativeelectrode material can effectively improve the initial charge-discharge efficiency, cycle performance and safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a silicon-based negative electrode material, a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental friendliness. Therefore, lithium-ion batteries have been widely used. At present, graphite is the most commonly used negative electrode material in lithium-ion batteries, and its theoretical specific capacity is 372mAh / g, which limits the development of lithium-ion batteries to higher energy density, while the theoretical specific capacity of silicon materials can reach 4200mAh / g , when it replaces graphite as the negative electrode material of lithium-ion batteries, it can significantly increase the energy density of lithium-ion batteries, and is a very promising next-generation negative electrode material. [0003] However, the huge volume change ...

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): H01M4/36H01M4/38H01M4/60H01M10/0525H01M10/44H01M4/1399H01M4/137H01M4/02
CPCH01M4/137H01M4/1399H01M4/366H01M4/386H01M4/602H01M10/0525H01M10/44H01M2004/021H01M2004/027Y02E60/10
Inventor 赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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