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Polysiloxane nanosheet-coated graphene sponge composite as well as preparation method and application thereof

A graphene sponge, polysiloxane technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as low reversible capacity, and achieve the effects of improving lithium battery performance, simple methods, and easy-to-control conditions

Active Publication Date: 2019-06-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Sun et al. (Sun H., et al.Science, 2017,356(6338):599.) prepared 3D-GNS / Nb using a two-step method 2 o 5 Composite electrode materials have achieved extremely high rate performance, and still have a capacity retention rate of more than 60% at 10°C, but their reversible capacity is still low

Method used

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  • Polysiloxane nanosheet-coated graphene sponge composite as well as preparation method and application thereof
  • Polysiloxane nanosheet-coated graphene sponge composite as well as preparation method and application thereof
  • Polysiloxane nanosheet-coated graphene sponge composite as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Step 1, use natural graphite powder as raw material, prepare graphene oxide by hummus method, add water and mix evenly, obtain 2.0mg / ml graphene oxide aqueous solution, and configure the concentration of ammonia water to be 1.0mol / L;

[0024] Step 2, take 17ml of graphene oxide aqueous solution (2.0mg / ml), 3ml of dilute ammonia solution (1.0mol / L), magnetically stir for 30min, mix them evenly and put them into the reactor for hydrothermal reaction at 120°C for 7h, until the reaction is over Then the box was cooled to room temperature; the obtained product was further freeze-dried for 48 hours to obtain an elastic 3D-graphene sponge (3D-GNS);

[0025] Step 3, take 1.5g hydrogen-containing silicone oil (PHMS) and 1.5g tetramethyltetravinyl cyclotetrasiloxane (D 4 Vi) Dissolve in 7g of absolute ethanol solution, add 1wt% chloroplatinic acid as a catalyst at the same time, mix evenly through magnetic stirring, and obtain a PSO solution with a PSO content of 30%;

[0026] S...

Embodiment 2

[0031] Step 1, use natural graphite powder as raw material, prepare graphene oxide by hummus method, add water and mix evenly, obtain 4.0mg / ml graphene oxide aqueous solution, and configure the concentration of ammonia water to be 5.0mol / L;

[0032] Step 2: Take 20ml of graphene oxide aqueous solution (4.0mg / ml) and 2ml of dilute ammonia solution (5.0mol / L), stir them magnetically for 20min, mix them evenly, put them into the reaction kettle together for hydrothermal reaction at 200°C for 12h, and wait for the reaction to end Then the box was cooled to room temperature; the obtained product was further freeze-dried for 48 hours to obtain an elastic 3D-graphene sponge (3D-GNS);

[0033] Step 3, get 1.2g hydrogen-containing silicone oil (PHMS) and 12g tetramethyltetravinyl cyclotetrasiloxane (D 4After vi), add 1wt% chloroplatinic acid as a catalyst therein, and mix uniformly by magnetic stirring to obtain a PSO solution;

[0034] Step 4, first treat the 3D-GNS obtained in step ...

Embodiment 3

[0037] Step 1, use natural graphite powder as raw material, prepare graphene oxide by hummus method, add water and mix evenly, obtain 1.0mg / ml graphene oxide aqueous solution, and configure the concentration of ammonia water to be 0.5mol / L;

[0038] Step 2: Take 10ml of graphene oxide aqueous solution (1.0mg / ml) and 10ml of dilute ammonia aqueous solution (0.5mol / L), stir it magnetically for 30min, mix them evenly, put them into the reactor together, and conduct a hydrothermal reaction at 150°C for 9h, until the reaction is over Then the box was cooled to room temperature; the obtained product was further freeze-dried for 60 hours to obtain an elastic 3D-graphene sponge (3D-GNS);

[0039] Step 3, take 0.3g hydrogen-containing silicone oil (PHMS) and 0.2g tetramethyltetravinyl cyclotetrasiloxane (D 4 Vi) Dissolve in 10g of absolute ethanol solution, add 1.5wt% chloroplatinic acid as a catalyst at the same time, and mix evenly by magnetic stirring to obtain a PSO solution;

[0...

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Abstract

The invention provides a polysiloxane nanosheet-coated graphene sponge composite as well as a preparation method and application thereof. The preparation method comprises the following steps: taking hydrothermally prepared 3D-GNS as an impregnation preform and polysiloxane as precursor solution, and realizing an effect that PSO is adsorbed on the surfaces of nano graphene sheets through vacuum impregnation; and performing crosslinking and pyrolysis, thus a SiOC nano layer-coated 3D-GNS composite electrode material is obtained. The invention provides a simple method for preparing a 3D-GNS / SiOCcomposite electrode material, cost is low, and conditions are easy to control; the prepared 3D-GNS / SiOC composite electrode material can be used for preparing a SiOC electrode material with a three-dimensional communicated graphene conductive network and a 'sandwich' structure (SiOC / GNS / SiOC); three-dimensional graphene sponge modification is adopted, thereby having great significance in preparation of other high-performance composite electrode materials; and 3D-GNS / SiOC has relatively high capacity and rate performance when being taken as a lithium battery anode material, and the current highenergy demand development trend is met.

Description

technical field [0001] The invention relates to the technical field of synthesis of graphene and inorganic nano-composite materials, and more specifically relates to a vacuum impregnation method for preparing SiOC nanosheet-coated graphene sponge composite materials and its preparation method and application. Background technique [0002] With the development of power systems and the miniaturization of electronic devices, there is an urgent need to develop lightweight and efficient energy storage devices. Lithium-ion batteries are known for their high discharge voltage, high specific energy, large specific power, stable discharge and long service life. And other advantages, widely used in portable electronic equipment, such as electric vehicles, implanted medical equipment and other fields. At present, the commonly used anode material for commercial lithium batteries is graphite, but its theoretical capacity is only 372mAh / g, and the graphite sheets are easily damaged and pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCY02E60/10
Inventor 苏冬桑志远苗培霜张峰瑞季惠明李晓雷
Owner TIANJIN UNIV
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