Preparation method and application of silicon dioxide/biochar composite material

A technology of silica and composite materials, which is applied in nanotechnology, electrochemical generators, secondary batteries, etc. for materials and surface science, can solve the problems of conversion reaction volume expansion, etc., and achieve high cycle specific capacity, effective Good for large-scale preparation and low price

Active Publication Date: 2019-04-23
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the key issues at present are how to improve the efficiency of the conversion reaction and how to solve the problem of volume expansion after the conversion reaction occurs.

Method used

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  • Preparation method and application of silicon dioxide/biochar composite material
  • Preparation method and application of silicon dioxide/biochar composite material
  • Preparation method and application of silicon dioxide/biochar composite material

Examples

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preparation example Construction

[0030] A preparation method of silicon dioxide / biochar composite lithium-ion battery negative electrode material, comprising the steps of:

[0031] Step 1: Take out an egg yolk, put it in a beaker and stir it mechanically (the speed is controlled at 500r min throughout the process) -1 ) under the action of adding water and ethanol in order to dilute (water and ethanol were added 50-100mL, and the volume ratio was controlled at 1:1), and after stirring for 15min, 2-6mL (2mL, 3mL, 6mL) ammonia water was added dropwise to Provide an alkaline environment, then add 2-6mLTEOS (2mL, 3mL, 4mL, 5mL, 6mL) dropwise, keep stirring at room temperature for 3-12h (3h, 6h, 12h), and finally freeze the obtained light yellow viscous liquid Drying gave an intermediate product.

[0032] Step 2: Get 0.5g of the intermediate obtained in step 1 and put it into a crucible, put the crucible into a tube furnace, and feed 5% hydrogen-argon gas mixture into the tube furnace (nitrogen, argon, helium, A ...

Embodiment 1

[0038] Take out the yolk of an egg and put it in a beaker, at 500r min -1 Under the action of mechanical stirring, add 35mL water and 35mL ethanol next time, after stirring for 15min, add 3mL ammonia water with a mass fraction of 25-28% dropwise, and then add 4mLTEOS dropwise, and keep stirring at room temperature for 3h after the dropwise addition.

[0039]The obtained pale yellow viscous liquid was freeze-dried for 24 hours, weighed 0.5 g of the precursor, put it into a crucible, and calcined it in a tube furnace with a mixed atmosphere of hydrogen and argon. The heating rate was set at 5 °C min -1 , the calcination temperature was 800°C, and the calcination time was 4h to obtain a silica / biochar composite material.

[0040] The black powder obtained by calcining was mixed with 4mL 0.1g mL -1 Diluted with NaOH to 100mL and soaked for 12 to obtain a porous structure, after centrifugation, washed with water and ethanol three times respectively, and dried in a vacuum oven at 8...

Embodiment 2

[0045] Take out the yolk of an egg and put it in a beaker, at 500r min -1 Under the action of mechanical stirring, add 35mL water and 35mL ethanol at a time. After stirring for 15min, add 3mL concentrated ammonia water dropwise, and then add 4mL TEOS dropwise. After the dropwise addition, keep stirring at room temperature for 6h.

[0046] The obtained pale yellow viscous liquid was freeze-dried for 24 hours, weighed 0.5 g of the precursor, put it into a crucible, and calcined it in a tube furnace with a mixed atmosphere of hydrogen and argon. The heating rate was set at 5 °C min -1 , the calcination temperature was 800°C, and the calcination time was 4h to obtain a silica / biochar composite material.

[0047] The black powder obtained by calcining was mixed with 4mL 0.1g mL -1 The KOH was diluted to 100mL and soaked for 12 hours to obtain a porous structure. After centrifugation, it was washed three times with water and ethanol and placed in a vacuum oven at 80°C for 8 hours t...

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Abstract

The invention provides a preparation method and the application of a silicon dioxide / biochar composite material. The preparation method comprises the following steps: mixing raw egg yolk with a water / ethanol mixed solution, uniformly stirring to form an egg yolk solution, dropwise adding ammonia water into the egg yolk solution, fully stirring, dropwise adding tetraethyl orthosilicate, and stirring to react at room temperature after dropwise adding is completed to obtain a silicon dioxide / egg yolk mixed solution; carrying out freeze drying on the silicon dioxide / egg yolk mixed solution to obtain silicon dioxide / biochar composite material precursor powder; putting the silicon dioxide / biochar composite material precursor powder into a tubular furnace, carrying out programmed heating to a calcination temperature in a protective atmosphere, calcining, and naturally cooling to room temperature after the calcination is finished; soaking the calcined material in a NaOH solution and a KOH solution respectively, centrifuging, washing and drying to obtain the silicon dioxide / biochar negative electrode material. The preparation method is simple, easy to operate and beneficial to large-scale preparation.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy materials, and discloses a preparation method and application of a silicon dioxide / bio-char composite material. Background technique [0002] With the depletion of fossil energy and the seriousness of environmental pollution, electrochemical energy storage has received more and more attention. Gasoline-electric hybrid vehicles, pure electric vehicles, and plug-in hybrid vehicles have been vigorously developed and applied. Lithium-ion batteries have high output voltage, high capacity, light weight, no memory effect and many other advantages, and have been widely used in power batteries. However, the currently used intercalation graphite negative electrode material (theoretical capacity 372mAh g -1 ) can no longer meet the requirements of high cruising range of electric vehicles. Therefore, it is imminent to develop anode materials for lithium-ion batteries with high energy density....

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/48H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 邱静霞王广祁莹丁华瑞包健连加彪
Owner JIANGSU UNIV
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