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Silicon-carbon composite material as well as preparation method and application thereof

A technology of silicon-carbon composite materials and carbon nanometers, which is applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of easy falling off, broken, low mechanical strength, etc.

Active Publication Date: 2021-11-05
重庆锦添翼新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene foam has low mechanical strength and smooth surface, which makes other materials easy to fall off and break when it is loaded on its surface.

Method used

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  • Silicon-carbon composite material as well as preparation method and application thereof
  • Silicon-carbon composite material as well as preparation method and application thereof
  • Silicon-carbon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing a silicon-carbon composite material, comprising the following steps:

[0053] Step 1: Foam Nickel Pretreatment

[0054] Thickness 2mm, bulk density 5g / cm 3 , soak nickel foam with a purity ≥ 90% in 2M hydrochloric acid, 100W ultrasonic cleaning for 20 minutes, and then clean the residual hydrochloric acid with deionized water;

[0055] Step 2: Loading of carbon nano toughening agent

[0056] Disperse carbon nanotubes with a diameter of 10-50nm, a length of 1-50μm, and a carbon content ≥ 95% in an aqueous solution of cetyltrimethylammonium bromide with a concentration of 3g / L to form a carbon nanotube with a concentration of 3g / L Solution A, then evenly coat solution A on the nickel foam treated in step 1, then dry at -0.1MPa for 6h, the loading of carbon nanotubes on the nickel foam is 0.1-5mg / cm 2 ;

[0057] Step 3: CVD growth graphene foam

[0058] The nickel foam obtained in step 2 is fed into a tube furnace at -0.1-0.15MPa to raise the te...

Embodiment 2

[0072] A method for preparing a silicon-carbon composite material, comprising the following steps:

[0073] Step 1: Foam Copper Pretreatment

[0074] Thickness 2mm, bulk density 5g / cm 3 , soak copper foam with a purity ≥ 90% in 2M hydrochloric acid, 100W ultrasonic cleaning for 20min, and then clean the residual hydrochloric acid with deionized water;

[0075] Step 2: Loading of carbon nano toughening agent

[0076] Disperse graphene nanobelts with a diameter of 10-50nm, a length of 1-50μm, and a carbon content ≥ 95% in an aqueous solution of sodium dodecyl sulfate with a concentration of 3g / L to form a solution A with a concentration of 2g / L of graphene nanobelts , and then uniformly coat solution A on the copper foam treated in step 1, then dry at -0.1MPa for 5h, and the loading capacity of graphene nanoribbons on the copper foam is 2mg / cm 2 ;

[0077] Step 3: CVD growth graphene foam

[0078] Put the copper foam obtained in step 2 into a tube furnace at -0.1-0.15MPa an...

Embodiment 3

[0092] A method for preparing a silicon-carbon composite material, comprising the following steps:

[0093] Step 1: Foam Iron Pretreatment

[0094] Thickness 5mm, bulk density 5g / cm 3 , Foam iron with a purity ≥ 90% is soaked in 2M hydrochloric acid, 100W ultrasonic cleaning for 20min, and then the residual hydrochloric acid is cleaned with deionized water;

[0095] Step 2: Loading of carbon nano toughening agent

[0096] Disperse carbon nanofibers with a diameter of 10-50nm, a length of 1-50μm, and a carbon content ≥ 95% in an aqueous solution of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer with a concentration of 3g / L , form a solution A with a carbon nanofiber concentration of 3g / L, and then uniformly coat solution A on the iron foam treated in step 1, and then dry at -0.1MPa for 6h, and the loading of carbon nanofibers on the iron foam is 0.1 -5mg / cm 2 ;

[0097] Step 3: CVD growth graphene foam

[0098] Put the iron foam obtained in s...

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Abstract

The invention discloses a silicon-carbon composite material and a preparation method and application thereof. A chemical vapor deposition method is adopted for preparing a graphene foam body which is subjected to in-situ toughening through a carbon nano toughening agent and has carbon nano tubes growing on the surface of the graphene foam body, and then the Si powder or SiOx powder with the carbon nano tubes or carbon nano sheets growing on the surface of the Si powder or SiOx powder is loaded in the graphene foam body, so that a flexible electrode based on the silicon-carbon composite material with a novel structure is prepared and is used as a negative electrode of a semi-solid, quasi-solid or all-solid-state battery. The silicon-carbon composite material prepared by the invention has the characteristics of high capacity and high cycle stability, has excellent interface wettability, stability and ion / electron conductivity with solid electrolyte, does not need a current collector, and remarkably improves the energy density and power density of the solid-state battery.

Description

technical field [0001] The present invention relates to the cross technical field of lithium-ion batteries and graphene materials, and more specifically relates to a silicon-carbon composite material and its preparation method and application. Background technique [0002] As a secondary battery with high energy density, lithium-ion batteries are widely used in mobile phones, digital, 3C and other product fields. In recent years, in order to get rid of the excessive dependence on the oil energy structure and actively deal with environmental pollution and other issues, my country has vigorously supported and encouraged the development of electric vehicles. Lithium-ion batteries, as the core power components of electric vehicles, have ushered in vigorous development. However, in order to achieve a higher cruising range of electric vehicles, the safety, energy density, and power density of lithium-ion batteries need to be improved. As the electrode material is a key factor det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 李新禄王雲锴
Owner 重庆锦添翼新能源科技有限公司
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