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A kind of porous silicon/titania/graphene composite material and its preparation method and application

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 The effect of completeness

Active Publication Date: 2022-08-05
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 electrolyte and active lithium, and also increase the polarization of the battery
However, these methods have more or less shortcomings of one kind or another, such as the high cost of nano-silicon, and in the existing silicon-carbon anode materials, it is difficult to maintain the structural stability of the active silicon material during the lithium ion deintercalation process, resulting in cycle The stability, rate performance and safety performance are not ideal, and the cost of using noble metals as catalysts is high, and the cost of silicon monoxide is also high, etc.

Method used

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  • A kind of porous silicon/titania/graphene composite material and its preparation method and application
  • A kind of porous silicon/titania/graphene composite material and its preparation method and application
  • A kind of porous silicon/titania/graphene composite material and its preparation method and application

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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-low speed (500 rpm) for 10min. Then put it into a constant temperature magnetic stirrer for heating and stirring in a water bath (the temperature is adjusted to 45°C, and the stirring speed is adjusted to a medium and low speed of 500 rpm / min), and 0.8ml of ammonia water (mass fraction 28%, density is 0.9g / cm) is measured. 3 ) was slowly added dropwise to the flask with a pipette, and then 0.416ml of tetrabutyl titanate was slowly added dropwise to the flask with a pipette, and the reaction was stirred for 16h.

[0060] 2. Take it out and evaporate most of the solution in a rotary evaporator, wash it with deionized water, centrifuge (the centrifugal speed is 6500-8000 rpm), and then vacuum dry it at 80°C and 12h for drying time. Grind with an agate mortar, and then put it into a high-t...

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 is 1-2μm), pour it into it, and stir magnetically at medium-low speed (500 rpm) for ten times. Then put it into a constant temperature magnetic stirrer for heating and stirring in a water bath (adjust the temperature to 45°C, and adjust the stirring speed to medium and low speed (500 rpm)), measure 0.8ml of ammonia water and slowly drop it into the flask with a pipette, and then measure Take 0.832ml of butyl titanate slowly dropwise into the flask with a pipette, and stir the reaction for 16h.

[0069] 2. Take it out and evaporate most of the solution in a rotary evaporator, wash it with deionized water, centrifuge (the rotation speed can be 6500-8000 rpm), and then vacuum dry it. The drying temperature is 80°C, and the drying time is 12h. It was ground with an agate mortar, then put into a high-temperature tube furnace for sintering at 450 ...

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, stir magnetically at medium-low speed (500 rpm) for ten minutes, and then Put it into a constant temperature magnetic stirrer, heat and stir in a water bath (adjust the temperature to 45°C, and adjust the stirring speed to medium and low speed (500 rpm)), measure 0.8ml of ammonia water and slowly drop it into the flask with a pipette, and then measure 0.208ml The butyl titanate was slowly added dropwise to the flask with a pipette, and the reaction was stirred for 16 h.

[0075]2. Take it out and evaporate most of the solution in a rotary evaporator, wash it with deionized water, centrifuge (the rotation speed can be 6500-8000 rpm), and then vacuum dry it. The drying temperature is 80°C, and the drying time is 12h. Grind with an agate mortar, and then put it into a high-temperature tube furnace for sintering at 450° C. for 2 hours...

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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, comprising: a titanium dioxide-coated porous silicon composite material and a reduced graphene oxide supporting the titanium dioxide-coated porous silicon composite material; the reduced graphite oxide is doped with Strong electronegativity element. The composite material has both the high lithium storage properties of silicon-based materials and the high cycle stability of carbon materials, and has the characteristics of high specific capacity, good cycle stability, excellent rate performance and safety performance, and low cost of preparation raw materials.

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, wristbands and electric vehicles has naturally derived higher requirements for battery performance. Traditional batteries have been unable to keep up with the current state 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 commercial promotion 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 primary energy storage technology in portable electron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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