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A kind of silicon oxide composite material, preparation method and application thereof

A silicon oxide, composite material technology, applied in silicon oxide, electrochemical generators, structural parts, etc., can solve the problems of difficult to control the degree of pre-lithiation, poor electrical conductivity, poor kinetic performance, etc., to improve electron transport performance, improving charge and discharge performance, and prolonging charge and discharge life

Active Publication Date: 2022-03-11
江苏载驰科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its poor conductivity leads to poor kinetics during the reaction; and the silicon dioxide contained in the silicon oxide material will generate Li during the first discharge reaction. 4 SiO 4 , Li 2 Si 2 o 5 Equivalent phase (Quartz(SiO2): anew energy storage anode material for Li-ion batteries, Energy Environ. Sci., 2012, 5, 6895- 6899), consumes more lithium ions and leads to the first efficiency lower than 70%
[0004] In order to improve the conductivity of silicon oxide, usually those skilled in the art will choose some organic substances for pyrolytic carbon coating, but the room for improvement is very limited
In order to improve the first charge and discharge efficiency of silicon oxide, technicians have improved the first efficiency from 61.9% to 94.4% through the method of pre-lithiation (Facile approach to SiOx / Si / C compositeanode material from bulk SiO for lithium ion batteries , Phys. Chem. Chem.Phys., 2013, 15, 14420-14426), but its operating environment is relatively harsh, and the degree of pre-lithiation is difficult to control, so it is currently limited to laboratory applications

Method used

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  • A kind of silicon oxide composite material, preparation method and application thereof
  • A kind of silicon oxide composite material, preparation method and application thereof
  • A kind of silicon oxide composite material, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] The first step is to ultrasonically disperse graphite oxide in absolute ethanol at a concentration of 3%. The graphite oxide is prepared by the hummer method, and the ultrasonic dispersion time is 30 minutes;

[0039] The second step is to stir and ultrasonically disperse silicon oxide in absolute ethanol for 20 minutes, the concentration is 40%;

[0040] The third step is to stir and dissolve the water-based adhesive in absolute ethanol, the stirring time is 20 minutes, and the concentration is 1%;

[0041] In the fourth step, the graphene oxide dispersion obtained in the first step, the silicon oxide dispersion obtained in the second step and the aqueous adhesive solution obtained in the third step are mixed according to the volume ratio of 1:2:0.1, and the stirring time is 20 minutes, and stir;

[0042] In the fifth step, the system obtained in the fourth step is subjected to a hydrothermal reaction at 160° C. for 4 hours;

[0043] In the sixth step, the product in...

Embodiment 2

[0047] The first step is to ultrasonically disperse graphite oxide in absolute ethanol at a concentration of 8%. The graphite oxide is prepared by the hummer method, and the ultrasonic dispersion time is 80 minutes;

[0048] The second step is to stir and ultrasonically disperse silicon dioxide in absolute ethanol for 50 minutes, the concentration is 60%;

[0049] The third step is to stir and dissolve the water-based adhesive in absolute ethanol, the stirring time is 40 minutes, and the concentration is 2%;

[0050] In the fourth step, the graphene oxide dispersion obtained in the first step, the silicon oxide dispersion obtained in the second step and the aqueous adhesive solution obtained in the third step are mixed according to the volume ratio of 2:2:0.1, and the stirring time is 80 minutes, and stir;

[0051] In the fifth step, the system obtained in the fourth step is subjected to a hydrothermal reaction at 180° C. for 10 h;

[0052] In the sixth step, the product in ...

Embodiment 3

[0056] In the first step, graphite oxide is ultrasonically dispersed in absolute ethanol, the concentration is 5%, graphite oxide is prepared by the hummer method, and the ultrasonic dispersion time is 50 minutes;

[0057] The second step is to stir and ultrasonically disperse silicon dioxide in absolute ethanol for 40 minutes, the concentration is 50%;

[0058] The third step is to stir and dissolve the water-based adhesive in absolute ethanol, the stirring time is 30 minutes, and the concentration is 2%;

[0059] In the fourth step, the graphene oxide dispersion obtained in the first step, the silicon oxide dispersion obtained in the second step and the aqueous adhesive solution obtained in the third step are mixed according to the volume ratio of 4:2:0.1, and the stirring time is 20-80 minutes, and stir;

[0060] In the fifth step, the system obtained in the fourth step is subjected to a hydrothermal reaction at 170° C. for 4-10 hours;

[0061] In the sixth step, the produc...

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Abstract

The invention discloses a silicon oxide / graphene composite material and a preparation method thereof. The steps are as follows: adding graphene oxide, silicon oxide and an aqueous binder into absolute ethanol, stirring and dissolving, and ultrasonically dispersing, and then The three systems are mixed and stirred evenly, put into a hydrothermal kettle to react for a certain period of time, then taken out, washed, and freeze-dried to obtain a silicon oxide / graphene composite material. The present invention uses graphite as a base material to prepare a silicon oxide / graphene composite material by a hydrothermal method. The silicon oxide / graphene composite material prepared by applying the invention has good application prospect and economic benefit as a negative electrode of a lithium ion battery.

Description

technical field [0001] The invention relates to a silicon oxide composite material, a preparation method and an application thereof, and belongs to the technical field of battery materials. Background technique [0002] Silicon oxide (SiO) is a next-generation new anode material with low expansion and long life, which can effectively improve the battery life of consumer electronics and electric vehicles. [0003] However, silicon oxide materials are currently used in lithium battery materials, and there is still a demand for further improvement in capacitance. Although the silicon oxide material has a higher theoretical specific capacity>2000mAh / g, a lower reaction voltage platform and a lower cost. However, its poor conductivity leads to poor kinetics during the reaction; and the silicon dioxide contained in the silicon oxide material will generate Li during the first discharge reaction. 4 SiO 4 , Li 2 Si 2 o 5 Equivalent phase (Quartz(SiO2): a new energy storage a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B33/113H01M4/36H01M4/48H01M4/583H01M10/0525
CPCC01B32/184C01B33/113H01M4/362H01M4/583H01M4/48H01M10/0525H01M2004/027C01P2004/80C01P2002/72C01P2004/03Y02E60/10
Inventor 张娟徐旭昇赵明才汪炜
Owner 江苏载驰科技股份有限公司
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