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A carbon-coated silicon oxide/g-c 3 n 4 Composite material, preparation method and application thereof

A silicon oxide, composite material technology, applied in nanotechnology, electrochemical generator, nanotechnology and other directions for materials and surface science, can solve the problem of battery capacity and cycle performance decline, material powder falling off, low conductivity and other problems, to achieve the effect of enhancing electron cloud density, improving conductivity, and low cost of raw materials

Active Publication Date: 2022-07-05
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon oxide also has some defects, such as low electrical conductivity, severe polarization
In addition, there is a large volume expansion in the process of deintercalating lithium, which easily leads to material powdering and falling off, resulting in a significant decrease in battery capacity and cycle performance.

Method used

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  • A carbon-coated silicon oxide/g-c <sub>3</sub> n <sub>4</sub> Composite material, preparation method and application thereof
  • A carbon-coated silicon oxide/g-c <sub>3</sub> n <sub>4</sub> Composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A carbon-coated silicon oxide / g-C 3 N 4 The preparation method of composite material comprises the following steps:

[0036] S1. Take 10g of urea powder and put it in an alumina crucible, then add 1mL of ammonia water to mix evenly, put it in a muffle furnace with a cover, heat it to 550°C at a speed of 1°C / min, keep calcined for 5h, and take it out after natural cooling Grind to get light yellow powder which is g-C 3 N 4 ;

[0037] S2. Add silicon oxide and glucose into a mortar at a mass ratio of 4:1 for full grinding for 30 minutes, then pour it into a porcelain boat, transfer it to a tube furnace, and feed N 2 , and heated to 600°C at a rate of 10°C / min, kept calcined for 6h, and then naturally cooled to obtain carbon-coated silicon oxide;

[0038] S3, the g-C 3 N 4 Add the carbon-coated silicon oxide to deionized water at a mass ratio of 1:3, stir and mix at 80 °C, then add polyethylene glycol, stir magnetically for 30 min to mix evenly, then suction filter,...

Embodiment 2

[0040] A carbon-coated silicon oxide / g-C 3 N 4 The preparation method of composite material comprises the following steps:

[0041] S1. Take 10g of melamine powder and put it in an alumina crucible, then add 2mL of ammonia water to mix evenly, put it in a muffle furnace with a cover, heat it to 550°C at a speed of 2°C / min, keep calcined for 3 hours, and take it out after natural cooling Grind to get light yellow powder which is g-C 3 N 4 ;

[0042] S2. Add silicon oxide and chitosan into a mortar at a mass ratio of 4:3 for full grinding for 30 minutes, then pour it into a porcelain boat, transfer it to a tube furnace, and feed N 2 , and heated to 600°C at a rate of 10°C / min, kept calcined for 6h, and then naturally cooled to obtain carbon-coated silicon oxide;

[0043] S3, the g-C 3 N 4 Add the carbon-coated silicon oxide to deionized water at a mass ratio of 1:3, stir and mix at 80 °C, then add polyethylene glycol, stir magnetically for 30 min to mix evenly, then sucti...

Embodiment 3

[0047] A carbon-coated silicon oxide / g-C 3 N 4 The preparation method of composite material comprises the following steps:

[0048] S1. Take 10g of melamine powder and put it in an alumina crucible, then add 3mL of ammonia water to mix evenly, put it in a muffle furnace with a cover, heat it to 550°C at a speed of 2°C / min, keep it calcined for 3h, and take it out after natural cooling Grind to get light yellow powder which is g-C 3 N 4 ;

[0049] S2. Add silicon oxide and glucose into a mortar at a mass ratio of 3:1 for full grinding for 30 minutes, then pour it into a porcelain boat, transfer it to a tube furnace, and feed N 2 , and heated to 600°C at a rate of 10°C / min, kept calcined for 6h, and then naturally cooled to obtain carbon-coated silicon oxide;

[0050] S3, the g-C 3 N 4 Add the carbon-coated silicon oxide to deionized water at a mass ratio of 1:3, stir and mix at 80 °C, then add polyethylene glycol, stir magnetically for 30 min to mix evenly, then suction ...

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Abstract

The invention discloses a carbon-coated silicon oxide / g-C 3 N 4 A composite material, the raw materials of which include: carbon-coated silica and g‑C 3 N 4 , wherein, in the composite material, the content of silicon oxide is 50-85%, g-C 3 N 4 The content is 10-45%, and the balance is coated carbon; silicon oxide, g-C 3 N 4 The sum of the content of coating carbon is 100%. The invention also discloses the above carbon-coated silicon oxide / g-C 3 N 4 Method for preparing composite materials. The invention also discloses the above carbon-coated silicon oxide / g-C 3 N 4 Application of composite materials in lithium-ion battery anode materials. The invention can significantly improve the ionic conductivity and electronic conductivity of the silicon oxide, and can buffer the volume change of the silicon oxide in the process of lithium deintercalation, reduce the volume expansion, and improve the capacity retention rate and cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a carbon-coated silicon oxide / g-C 3 N 4 Composite material, preparation method and application thereof. Background technique [0002] Since its commercialization, lithium-ion batteries have been highly respected for their long cycle life, high safety, and high specific energy, and have been widely used in portable devices such as mobile phones, notebook computers, and digital products. The vigorous promotion of lithium-ion batteries has put forward higher requirements for the energy density and power density of lithium-ion batteries. The traditional lithium-ion battery anode materials are mostly graphite anode materials, and their theoretical reversible specific capacity is only 372mAh / g, and the battery energy density is difficult to exceed 300Wh / kg. Therefore, there is an urgent need to develop anode materials that can replace graphite. [0003] Silicon oxide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/483H01M4/62H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 薛安
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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