Porous silicon/titanium dioxide/graphene composite material as well as preparation method and application thereof

A technology of titanium dioxide and composite materials, applied in the direction of titanium dioxide, titanium oxide/hydroxide, graphene, etc., can solve the problems of SEI cracking, high catalyst cost, particle pulverization, etc., to ensure stability, ensure structural stability and Integrity effect

Active Publication Date: 2021-09-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) Silicon particles themselves will be powdered due to their inability to withstand the huge stress caused by volume deformation during the repeated lithium deintercalation process;
[0007] 2) The huge volume deformation makes the electrical contact between the silicon particles or between the particles and the current collector be lost, and even the active material directly falls off from the current collector;
[0008] 3) The huge volume deformation will cause the SEI on the silicon surface to break and form continuously, consume a large amount of electro...

Method used

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  • Porous silicon/titanium dioxide/graphene composite material as well as preparation method and application thereof
  • Porous silicon/titanium dioxide/graphene composite material as well as preparation method and application thereof
  • Porous silicon/titanium dioxide/graphene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1. Weigh 240ml of absolute ethanol and pour it into a flask with a stirring bar, weigh 1g of aluminum-silicon alloy (particle size 1-2μm), pour it into it, and stir magnetically at medium and low speed (500 rpm) for 10 minutes. Then put it into a constant temperature magnetic stirrer for heating and stirring in a water bath (adjust the temperature to 45°C, adjust the stirring speed to a medium and low speed of 500 rpm), measure 0.8ml of ammonia water (mass fraction 28%, density 0.9g / cm 3 ) was slowly added dropwise into the flask with a pipette gun, and then 0.416ml of tetrabutyl titanate was slowly added dropwise into the flask with a pipette gun, and stirred for 16 hours.

[0060] 2. Take it out again and evaporate most of the solution with a rotary evaporator, wash with deionized water, centrifuge (centrifugal speed is 6500-8000 rpm), and then vacuum-dry at 80°C for 12 hours. After that, Grind it with an agate mortar, put it into a high-temperature tube furnace and s...

Embodiment 2

[0068] 1. Weigh 240ml of absolute ethanol and pour it into a flask with a stirring bar, weigh 1g of aluminum-silicon alloy (particle size 1-2μm), pour it into it, and stir it with a medium-low speed (500 rpm) for ten Minutes, then put it into a constant temperature magnetic stirrer and heat and stir in a water bath (adjust the temperature to 45°C, adjust the stirring speed to medium and low speed (500 rpm)), measure 0.8ml of ammonia water and slowly add it dropwise to the flask with a pipette, and then measure Take 0.832ml of butyl titanate and slowly drop it into the flask with a pipette gun, and stir the reaction for 16h.

[0069] 2. Take it out and evaporate most of the solution with a rotary evaporator, then wash it with deionized water, centrifuge (the speed can be 6500-8000 rpm), and then carry out vacuum drying. The drying temperature is 80 ° C, and the drying time is 12 hours. After that, Grinding with an agate mortar, then sintering in a high-temperature tube furnace ...

Embodiment 3

[0074] 1. Weigh 240ml of absolute ethanol and pour it into a flask with a stirring bar, weigh 1g of aluminum-silicon alloy (1-2μm), pour it into it, and stir magnetically at medium and low speed (500 rpm) for ten minutes, then Put it into a constant temperature magnetic stirrer, heat and stir in a water bath (adjust the temperature to 45°C, adjust the stirring speed to medium-low speed (500 rpm)), measure 0.8ml of ammonia water and slowly drop it into the flask with a pipette gun, and then measure 0.208ml The butyl titanate was slowly added dropwise into the flask with a pipette gun, and the reaction was stirred for 16h.

[0075]2. Take it out and evaporate most of the solution with a rotary evaporator, then wash it with deionized water, centrifuge (the speed can be 6500-8000 rpm), and then carry out vacuum drying. The drying temperature is 80 ° C, and the drying time is 12 hours. After that, Grind it with an agate mortar, put it into a high-temperature tube furnace and sinter...

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Abstract

The invention relates to the technical field of batteries, in particular to a porous silicon/titanium dioxide/graphene composite material and a preparation method and application thereof. The invention discloses a porous silicon/titanium dioxide/graphene composite material. The porous silicon/titanium dioxide/graphene composite material comprises a titanium dioxide coated porous silicon composite material and reduced graphene oxide for supporting the titanium dioxide coated porous silicon composite material; the reduced graphite oxide is doped with a strong electronegative element. The composite material has the high lithium storage characteristic of a silicon material and the high cycle stability of a carbon material, and has the characteristics of high specific capacity, good cycle stability, excellent rate capability and safety performance, and the preparation raw materials are low in price.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a porous silicon / titanium dioxide / graphene composite material and a preparation method and application thereof. Background technique [0002] With the progress of the times, the rapid development of portable electronic products such as smartphones, tablets, bracelets, and electric vehicles has naturally derived higher requirements for battery performance. Traditional batteries have been unable to keep up with the status quo of technology and people's needs. Therefore, it is particularly urgent to develop batteries with higher performance. In the past few years, lithium-ion batteries have achieved great success in commercialization because of their high energy density, no memory effect, small self-discharge effect and Mature manufacturing technology and other advantages. Lithium-ion batteries are currently used as the main energy storage technology for portable electronic devic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M4/13H01M10/0525C01B32/184C01B33/021C01G23/047
CPCH01M4/366H01M4/386H01M4/483H01M4/625H01M4/13H01M10/0525C01B33/021C01G23/047C01B32/184C01P2004/80Y02E60/10
Inventor 罗文刘包平曾辉龙刘家兴方称辉黄金李新喜夏浩涛
Owner GUANGDONG UNIV OF TECH
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