Supercharge Your Innovation With Domain-Expert AI Agents!

Coated silicon-carbon negative electrode material, preparation method thereof and lithium ion battery

A negative electrode material and coating technology, which is applied in the field of battery negative electrode material preparation, can solve the problems of high cycle capacity and high cycle stability, and achieve high cycle capacity, improved cycle performance, and good cycle performance.

Pending Publication Date: 2021-04-06
NORTHERN ALTAIR NANOTECH CO LTD +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a coated silicon-carbon negative electrode material, its preparation method and lithium ion battery, so as to solve the problem that the existing coated silicon-carbon negative electrode material cannot meet the requirements of simple process, high cycle stability and cycle capacity at the same time. high 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
  • Coated silicon-carbon negative electrode material, preparation method thereof and lithium ion battery
  • Coated silicon-carbon negative electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] As described in the background art, the existing coated silicon-carbon anode materials cannot satisfy the problems of simple process, high cycle stability and high cycle capacity at the same time. In order to solve the above-mentioned technical problems, the application provides a method for preparing a coated silicon-carbon negative electrode material. The preparation method of the coated silicon-carbon negative electrode material includes: in a kneading device, silicon source, graphite and carbon source are Heating and mixing treatment to obtain a pretreated material; carbonizing the pretreated material to obtain a coated silicon-carbon negative electrode material.

[0020] In the above preparation method, before the carbonization process, a kneading device is used to heat and mix the silicon source, graphite and carbon source to form a pretreated material. Compared with conventional mixing methods, heating while mixing in a kneading device can greatly improve the deg...

Embodiment 1

[0034] A method for preparing a coated silicon-carbon negative electrode material comprises:

[0035] In the kneading pot, the silicon source (silicon powder, 60nm), artificial graphite, and sucrose are heated and mixed in a weight ratio of 1:8.5:16 to obtain the pretreated material. The heating temperature is 120°C, and the stirring blade of the kneading pot The rotation speed is 20r / min, and the stirring time is 3h.

[0036]Transfer the well-stirred silicon powder, artificial graphite, and carbon source into a quartz pot while hot, put the quartz pot into a high-temperature tube furnace, and carry out carbonization treatment according to the following roasting curve: heat up at a rate of 2°C / min to 860 After keeping warm for 3 hours at ℃, let it cool down to room temperature naturally. During the whole process, it is protected by argon gas at 50ml / min.

[0037] Put the carbonized product in the above-mentioned high-temperature tube furnace in a zirconium spherical tank and ...

Embodiment 2

[0040] The difference with Example 1 is: in the kneading pot, the silicon source (silicon powder, 60nm), artificial graphite, and sucrose are heated and mixed in a weight ratio of 1:2:20 to obtain a pretreated material, wherein the heating temperature is 120°C, the rotating speed of the stirring knife in the kneading pot is 10r / min, and the stirring time is 5h.

[0041] The initial capacity is 1405mAh / g, the initial efficiency is 85%, and the capacity retention rate of 50 cycles is 82%.

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
Granularityaaaaaaaaaa
Diameteraaaaaaaaaa
Lengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a coated silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. The preparation method of the coated silicon-carbon negative electrode material comprises the following steps: heating and mixing a silicon source, graphite and a carbon source in a kneading device to obtain a pretreated material; and carbonizing the pretreated material to obtain the coated silicon-carbon negative electrode material. Before a carbonization process, the kneading device is adopted to heat and mix the silicon source, graphite and the carbon source to form the pretreated material. Compared with a conventional mixing mode, the kneading and coating degrees of the silicon source, the carbon source and the graphite can be greatly improved by heating while mixing in the kneading device. After the carbonization process, the carbon source and the silicon coat the surface of the graphite, and the graphite has certain softness, so that the expansion rate of the silicon in the charging and discharging process can be reduced to a certain extent, and the cycle performance of the carbon-silicon material is further improved. Meanwhile, the preparation method is simple and easy to implement, low in cost and easy for industrial production.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for batteries, in particular to a coated silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] The gram capacity of the Si-based negative electrode material is as high as 3500mAh / g or more. Compared with the graphite negative electrode material, the theoretical energy density of the coated silicon carbon negative electrode material is more than 10 times higher. However, the coated silicon-carbon anode material has a natural defect, that is, the insertion of lithium into the silicon unit cell will cause serious expansion of the silicon material, which will cause a rapid decline in capacity. In order to improve the cycle stability of silicon-based negative electrode materials, the existing silicon-carbon materials mainly include coating type, embedded type and doped type, but their preparation metho...

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): C01B32/21C01B33/02C01B32/05B82Y30/00H01M4/62H01M4/36H01M4/38H01M10/0525
CPCB82Y30/00C01B33/02C01B32/05C01B32/21H01M4/366H01M4/386H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杜孟衣雷磊赵晓磊成信刚
Owner NORTHERN ALTAIR NANOTECH CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com