Preparation method of silicon and carbon composite microspheres and application thereof

A technology of silicon-carbon composites and microspheres, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of poor material uniformity, poor silicon-carbon interface contact, and poor silicon dispersion, and achieve simple and practical preparation methods High degree, the effect of improving poor circulation

Inactive Publication Date: 2011-01-12
INST OF CHEM CHINESE ACAD OF SCI
View PDF3 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in silicon-carbon composite materials. The pyrolysis method, ball milling method, vapor deposition method and polymerization-pyrolysis method are used in

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
  • Preparation method of silicon and carbon composite microspheres and application thereof
  • Preparation method of silicon and carbon composite microspheres and application thereof
  • Preparation method of silicon and carbon composite microspheres and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1. Preparation of silicon-carbon composite microspheres and testing of its electrochemical performance

[0031] Mix chitosan (weight average molecular weight 89000): silicon quantum dots = 50: 0.1 (mass ratio), use water as the solvent, and stir at room temperature for more than 24 hours to obtain the mass concentration of chitosan and silicon quantum dots The sum is 1% solution, spray drying, the inlet temperature is 120°C, and the outlet temperature is 110°C. The obtained microspheres are raised from room temperature to 800°C at a rate of 10°C / min under the protection of nitrogen, and are kept at a constant temperature for 6 hours and then naturally cooled to room temperature to obtain silicon-carbon composite microspheres.

[0032] Characterization of silicon-carbon composite microspheres:

[0033] The particle size and particle size distribution of the silicon-carbon composite microspheres obtained under the above conditions were tested with a Japanese electron sc...

Example Embodiment

[0038] Example 2: Preparation of silicon-carbon composite microspheres and testing of its electrochemical performance

[0039] Mix chitosan (weight average molecular weight 89000): silicon powder = 20: 0.1 (mass ratio), use water as solvent, stir at room temperature for more than 24 hours, to obtain the sum of the mass concentration of chitosan and silicon powder It is a 5% solution. The polymer solution was spray-dried with an inlet temperature of 150°C and an outlet temperature of 120°C. The obtained microspheres were raised from room temperature to 300°C at a rate of 15°C / min under the protection of nitrogen, and then dropped to room temperature at a rate of 10°C / min after being kept at a constant temperature for 6 hours to obtain silicon-carbon composite microspheres.

[0040] The positive electrode, negative electrode, electrolyte and battery assembly of the simulated battery are the same as in Example 1. The composition of the obtained silicon-carbon composite microspheres a...

Example Embodiment

[0041] Example 3 Preparation of silicon-carbon composite microspheres and testing of its electrochemical performance

[0042] Mix according to the ratio (mass ratio) of sodium carboxymethyl cellulose (weight average molecular weight is 250,000): silicon monoxide = 1:0.1, use water as the solvent and stir at room temperature for more than 24 hours to obtain sodium carboxymethyl cellulose and A solution in which the sum of the mass concentration of silicon monoxide is 50%. The polymer solution was spray dried with an inlet temperature of 180°C and an outlet temperature of 105°C. The obtained microspheres were raised from room temperature to 1000°C at a rate of 20°C / min under the protection of nitrogen, and then dropped to room temperature at a rate of 10°C / min after being kept at a constant temperature for 6 hours to obtain silicon-carbon composite microspheres.

[0043] The positive electrode, negative electrode, electrolyte and battery assembly of the simulated battery are the sam...

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
Discharge capacityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of silicon and carbon composite microspheres and an application thereof as a negative electrode material of a lithium ion battery. The preparation method of the silicon and carbon composite microspheres comprises the following steps: 1) spray drying is carried out on solution containing a silicon source and a carbon source, thus obtaining spherical particles, wherein the carbon source is carbon-containing high molecular polymer; and 2) the spherical particles are sintered under non-oxidizing atmosphere, thus obtaining the silicon and carbon composite microspheres. The preparation method is simple and practicable, can realize large-scale production and has high practicality degree, and the obtained silicon and carbon composite microspheres integrate the advantages of a silicon and carbon composite material and a porous material and improve the problems of poor cyclicity and low coulomb efficiency of a silicon-based material as the negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a silicon-carbon composite microsphere and its application as a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries are ideal for portable electronic devices such as mobile phones and notebook computers because of their outstanding advantages such as high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight, and small size. power supply. In order to meet the requirements of use, high-capacity and long-life lithium-ion batteries have become an important research direction for the development of lithium-ion batteries. Since the specific capacity of the positive electrode material is relatively low, there is not much room for capacity improvement, so the development of high-capacity lithium-ion batteries is mainly concentrated on the negative electrode material. The existin...

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): H01M4/139H01M4/38
CPCY02E60/122Y02E60/10
Inventor 郭玉国殷雅侠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap