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

Method for producing lithium battery silicon-carbon negative electrode active material by magnetic coating ball milling

A negative electrode active material, lithium battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as poor cycle performance and stability, poor silicon-carbon composite effect, and complexity, and achieve convenient operation and excellent performance. , the effect of simple preparation process

Inactive Publication Date: 2021-01-22
CHENDU NEW KELI CHEM SCI CO LTD
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the above, the silicon-based negative electrode materials used in lithium batteries in the existing schemes have the defects of poor cycle performance and stability, while the silicon-carbon negative electrodes obtained by carbon coating modification have better performance, but the current silicon-carbon Most of the negative electrode production schemes are relatively complicated, and usually require high-energy ball milling and high-temperature carbonization processes, and the effect of silicon-carbon compounding is relatively poor. The present invention proposes a method for producing silicon-carbon negative electrode active materials for lithium batteries by magnetically coated ball milling, which can effectively solve the above-mentioned problems. technical problem

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 producing lithium battery silicon-carbon negative electrode active material by magnetic coating ball milling
  • Method for producing lithium battery silicon-carbon negative electrode active material by magnetic coating ball milling
  • Method for producing lithium battery silicon-carbon negative electrode active material by magnetic coating ball milling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) First mix silicon powder and iron powder evenly, then add ball milling aids and place in a ball mill with a protective atmosphere of nitrogen, ball mill for 3 hours at a speed of 920r / min and a ball-to-material ratio of 2.6:1, and then ball mill The slurry is placed in a vacuum furnace for vacuum annealing, and the product is collected to obtain powder A; the average particle size of the silicon powder is 110nm; the average particle size of the iron powder is 250nm; The proportion is, by weight, 17 parts by weight of dispersant, 6 parts by weight of adhesive, and 160 parts by weight of solvent; wherein, the dispersant is NMP, the adhesive is SBR, and the solvent is absolute ethanol; the temperature of vacuum annealing at 130°C for 36 minutes;

[0048] The ratio of each raw material is, in parts by weight, 30 parts by weight of silicon powder, 40 parts by weight of iron powder, and 190 parts by weight of ball milling aid;

[0049] (2) First place the porous carbon p...

Embodiment 2

[0054] (1) Mix silicon powder and iron powder evenly first, then add ball milling aids and place in a ball mill with a protective atmosphere of nitrogen, ball mill for 5 hours at a speed of 60r / min and a ball-to-material ratio of 2:1, and then ball mill The slurry is placed in a vacuum furnace for vacuum annealing, and the product is collected to obtain powder A; the average particle size of the silicon powder is 100nm; the average particle size of the iron powder is 200nm; The proportion is, by weight, 16 parts by weight of dispersant, 5 parts by weight of adhesive, and 180 parts by weight of solvent; wherein, the dispersant is PVP, the adhesive is PVDF, and the solvent is NMP; the temperature of vacuum annealing is 1150 ℃, the time is 38min;

[0055] The ratio of each raw material is, in parts by weight, 10 parts by weight of silicon powder, 20 parts by weight of iron powder, and 250 parts by weight of ball milling aid;

[0056] (2) First place the porous carbon powder in a...

Embodiment 3

[0061] (1) First mix silicon powder and iron powder evenly, then add ball milling aids and place in a ball mill with a protective atmosphere of nitrogen, ball mill for 1 hour at a speed of 100r / min and a ball-to-material ratio of 3:1, and then ball mill The slurry is placed in a vacuum furnace for vacuum annealing, and the product is collected to obtain powder A; the average particle size of silicon powder is 150nm; the average particle size of iron powder is 400nm; ball milling aids include dispersant, binder, solvent, and various raw materials The proportion is, by weight, 19 parts by weight of dispersant, 9 parts by weight of adhesive, and 120 parts by weight of solvent; wherein, the dispersant is sodium hexametaphosphate, the adhesive is stearic acid, and the solvent is deionized water ;The temperature of vacuum annealing is 140℃, and the time is 33min;

[0062] The ratio of each raw material is, in parts by weight, 40 parts by weight of silicon powder, 40 parts by weight ...

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
Average particle sizeaaaaaaaaaa
Average particle sizeaaaaaaaaaa
Average particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of lithium battery negative electrodes, and discloses a method for producing a lithium battery silicon-carbon negative electrode active material by magnetic coatingball milling. The preparation method comprises the following steps of: (1) mixing and ball-milling silicon powder and iron powder, and carrying out vacuum annealing to obtain powder A; (2) modifying porous carbon powder by using an anionic surfactant, then mixing the modified porous carbon powder with a ferrite precursor, deionized water and anhydrous ethanol to prepare a turbid liquid, carrying out ultrasonic oscillation, performing filtering, collecting the filter residue, and carrying out vacuum sintering and magnetization to obtain powder B; and (3) adding the powder A, the powder B and aPTFE emulsion into deionized water to prepare turbid liquid, carrying out ultrasonic dispersion, then performing standing and settling, and granulating, annealing, grinding and screening settled substances to obtain the lithium battery silicon-carbon negative electrode active material. According to the preparation method, the uniformity and the compounding capacity of the silicon powder and the carbon powder are effectively improved through the metal adsorption capacity of the magnetic material, the obtained silicon-carbon negative electrode material has excellent cycle performance, meanwhile,the preparation process is simple, and the large-scale production potential is achieved.

Description

technical field [0001] The invention relates to the field of negative electrodes of lithium batteries, and discloses a method for producing silicon-carbon negative electrode active materials of lithium batteries by magnetically coated ball milling. Background technique [0002] In recent years, the rapid development of the field of new energy power generation has put forward new requirements for the matching energy storage system. In the replacement of energy storage batteries, lithium-ion batteries have become a key research field due to their various advantages, and have been practically applied in a large number of energy storage projects and achieved certain results. The capacity of a lithium-ion battery depends on the active lithium ions of the positive electrode material and the ability of the negative electrode material to intercalate and remove lithium. The stability of the positive and negative electrodes in various environments determines the performance of the bat...

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): H01M4/62H01M4/38H01M10/0525H01M10/04
CPCH01M4/386H01M4/628H01M10/0427H01M10/0525H01M2004/021H01M2004/027Y02E60/10Y02P70/50
Inventor 陈庆廖健淞白涛李钧
Owner CHENDU NEW KELI CHEM SCI 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