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

Silicon/carbon composite microsphere negative electrode material as well as preparation method and application for same

A negative electrode material and carbon composite technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of high delithiation potential, poor cycle performance of silicon-based negative electrode materials, high cost of Si nanowires, etc., and achieve high electronic conductivity and ionization Conductivity, improved structural stability and rate performance, good electronic conductance and ion transport channels

Active Publication Date: 2013-09-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF11 Cites 44 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, among the negative electrode materials used for lithium-ion batteries, graphite negative electrode capacity is low; silicon-based negative electrode materials have poor cycle performance, low reversible capacity, high delithiation potential, and low Coulombic efficiency. SiH4 vapor deposition is used to prepare Si nanometers. Line cost is high
However, the preparation process of silicon / carbon composite negative electrode materials is complicated, the cost of raw materials is high, the sphericity of the material is poor, the requirements for equipment are high, the pollution is serious, it is difficult to obtain products with uniform performance, and there are defects such as difficulties in large-scale production, which lead to The manufacturing cost of silicon / carbon composite anode materials is too high to affect its practicability and industrialization

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/carbon composite microsphere negative electrode material as well as preparation method and application for same
  • Silicon/carbon composite microsphere negative electrode material as well as preparation method and application for same
  • Silicon/carbon composite microsphere negative electrode material as well as preparation method and application for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A method for preparing a silicon / carbon composite microsphere negative electrode material, comprising the steps of:

[0083] (1) Dissolve 3 grams of phenolic resin in 20 grams of ethanol to prepare solution A, mix 10 grams of needle coke treated at 2800°C, 0.5 grams of silicon powder, and 3 grams of tank black treated at 2800°C with 80 grams of water To prepare solution B, mix solution A and solution B and stir at 40°C for 2h;

[0084] (2) Use a spray dryer to dry and granulate the solution to obtain initial microspheres; the inlet temperature of the spray drying is 230°C, and the outlet temperature is 70-150°C;

[0085] (3) The obtained initial microspheres were carbonized at 800°C for 24 hours under a nitrogen atmosphere to obtain silicon / carbon composite microsphere anode materials;

[0086] Wherein, in the prepared silicon / carbon composite microsphere negative electrode material, the mass percentages of silicon powder, soft carbon, carbon black, and hard carbon are...

Embodiment 2

[0092] A method for preparing a silicon / carbon composite microsphere negative electrode material, comprising the steps of:

[0093] (1) Mix 10 grams of oil-based needle coke treated at 2500°C, 0.5 grams of silicon powder, 2 grams of gas black treated at 2500°C, 5 grams of glucose and 200 grams of water, and stir at 40°C for 2 hours;

[0094] (2) Use a spray dryer to dry and granulate the solution to obtain initial microspheres; the inlet temperature of the spray drying is 230°C, and the outlet temperature is 70-150°C;

[0095] (3) The obtained initial microspheres were carbonized at 1200°C for 5 hours under a nitrogen atmosphere to obtain a silicon / carbon composite microsphere anode material;

[0096] Wherein, in the prepared silicon / carbon composite microsphere negative electrode material, the mass percentages of silicon powder, soft carbon, carbon black, and hard carbon are 3wt%, 67wt%, 13wt%, and 17wt%, respectively. Among them, glucose is calculated as 50% converted to ha...

Embodiment 3

[0098] A method for preparing a silicon / carbon composite microsphere negative electrode material, comprising the steps of:

[0099] (1) Mix 20 grams of petroleum coke treated at 2100°C, 1.4 grams of silicon powder, 8 grams of furnace black treated at 2100°C, 20 grams of cornstarch and 800 grams of water, and stir at 30°C for 2 hours;

[0100] (2) Use a spray dryer to dry and granulate the solution to obtain initial microspheres with a particle size of about 3-50 μm; the inlet temperature of the spray drying is 230°C, and the outlet temperature is 70-150°C;

[0101] (3) Carbonize the obtained initial microspheres at 900°C for 2 hours under an argon atmosphere to obtain silicon-carbon composite microsphere anode materials;

[0102] (4) Treat the silicon / carbon composite microsphere anode material in an atmosphere of benzene as the carbon source and argon as the carrier gas at a temperature of 900 ° C and a pressure of 0.2 MPa for 12 hours to obtain a surface coated with a thickn...

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
Sizeaaaaaaaaaa
Sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a silicon / carbon composite microsphere negative electrode material as well as a preparation method and an application for the same. The silicon / carbon composite microsphere negative electrode material is silicon / carbon composite microspheres internally provided with pore structures; and each microsphere comprises a matrix material of hard carbon, and an active material of silicon powder. The preparation method for the silicon / carbon composite microsphere negative electrode material comprises the following steps of: uniformly mixing silicon powder, soft carbon, carbon black, a soluble carbon-containing organic adhesive and a solvent with formula amounts to obtain a slurry; and performing spray-drying and carbonization on the slurry to obtain the silicon / carbon composite microsphere negative electrode material. The silicon / carbon composite microsphere negative electrode material provided by the invention has the advantages of being high in tap density, high in reversible capacity, good in cyclicity, good in rate capability, safe and reliable, and high in first-week coulombic efficiency; the preparation method provided by the invention is simple in process, environment-friendly, low in energy consumption and cost, and easy to realize large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode materials, and relates to a lithium battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery silicon / carbon composite microsphere negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of equipment portability and various electronic components, the demand for high-energy-density secondary batteries is increasing. Among them, lithium-ion secondary batteries have become the future development of chemical power sources due to their high specific energy, light weight, and high operating voltage. direction. [0003] At present, the negative electrodes of lithium-ion secondary batteries mainly use carbon materials, such as petroleum coke, carbon fiber, pyrolytic carbon, natural graphite, artificial graphite, etc., which were originally patented by SONY Corpor...

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): H01M4/38H01M4/583H01M4/62
CPCY02E60/10
Inventor 苏发兵王艳红张美菊张在磊翟世辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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