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A kind of nano-silicon particle-graphite nano-sheet-carbon fiber composite material and its preparation method and application

A technology of graphite nanosheets and composite materials, applied in the field of nano silicon particles-graphite nanosheets-carbon fiber composite materials and their preparation, can solve the problems of low electrical conductivity, high cost, complicated process, etc. Low mechanical strength and capacity fading

Active Publication Date: 2017-08-29
湖北新南化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has serious volume effect (~300%) and low conductivity (6.7×10 -4 S / cm) caused by cycle stability bottleneck and low first coulombic efficiency, as well as difficulty in controlling the synthesis of Si, complex process, low yield, and high cost are the main problems hindering its industrial application and promotion.

Method used

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  • A kind of nano-silicon particle-graphite nano-sheet-carbon fiber composite material and its preparation method and application
  • A kind of nano-silicon particle-graphite nano-sheet-carbon fiber composite material and its preparation method and application
  • A kind of nano-silicon particle-graphite nano-sheet-carbon fiber composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of nano-silicon particle-graphite nanosheet-carbon fiber composite material, comprising the following steps:

[0042] Carry out amino modification on the surface of nano-silicon particles; ultrasonically disperse the nano-silicon particles in xylene to form a uniform solution of 50 mg / ml, and then add 10% of the mass of nano-silicon particles 3-aminopropyltriethoxy dropwise while stirring Silane, and then under the protection of an inert gas, reflux at 80°C for 12h, cool, filter, and dry.

[0043] Acid treatment of carbon materials composed of graphite nanosheets and carbon fibers (the mass ratio of graphite nanosheets and carbon fibers is 95:5): add nanographite sheets and carbon fibers to 1~3 mol / L nitric acid, and heat at 80°C , reflux for 0.5 ~ 3h.

[0044] Disperse 4 g of acid-treated graphite nanosheets in water, adjust the pH to 5, then add 1 g of amino-modified nano-silicon particles, stir for 12 h to obtain a mixed solution, filter the mix...

Embodiment 2

[0052] A preparation method of nano-silicon particle-graphite nanosheet-carbon fiber composite material, comprising the following steps:

[0053] Carry out amino modification on the surface of nano-silicon particles; ultrasonically disperse nano-silicon particles in xylene to form a uniform solution of 50mg / ml, and then add 10% N-aminoethyl-3-ammonia of the mass of nano-silicon particles dropwise while stirring Propyltriethoxysilane, and then under the protection of an inert gas, reflux at 80°C for 12h, cool, filter, and dry.

[0054] Acid treatment of carbon materials composed of graphite nanosheets and carbon fibers (the mass ratio of graphite nanosheets and carbon fibers is 95:5): add nanographite sheets and carbon fibers to 1~3 mol / L nitric acid, and heat at 80°C , reflux for 0.5 ~ 3h.

[0055] Put 4 g of acid-treated carbon materials in dispersing water, adjust the pH to 5, then add 1 g of modified nano-silicon particles to obtain a mixed solution, add 1-(3-dimethylamino...

Embodiment 3

[0062] Mix the carbon-coated nano-silicon particles-graphite nano-sheets-carbon fiber composite material prepared in Implementation 2 with carbon nano-fibers to obtain a multi-scale composite material, in which the nano-silicon particles-graphite nano-sheets-carbon fiber composite The material accounts for 90% of its weight, and carbon nanofibers account for 10% of its weight.

[0063] SEM or TEM characterization of the above multi-scale composite materials, such as figure 2 Shown:

[0064] The above-mentioned multi-scale composite material is used to make a lithium-ion battery, and the preparation method is the same as that in Embodiment 2.

[0065] test

[0066] Test conditions: the same as in Example 1.

[0067] After testing, the lithium-ion battery prepared in this example has a capacity of 847.5 mAh / g. The time required for the charge-discharge cycle of the battery with a current density of 2.5 A / g is 0.56h. During fast charge-discharge (when the charge-discharge r...

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Abstract

The invention provides a nanometer silicon particle-graphite flake-carbon nanotube composite material and a preparation method and application thereof. The preparation method comprises the following steps of uniformly loading nanometer silicon particles onto the surfaces of graphite flakes and the surfaces of carbon fibers through a coupling connection method or an electrostatic absorption method by taking the graphite flakes and the carbon fibers as substrates; uniformly coating the surface of the nanometer silicon particle-graphite flake-carbon nanotube composite material; and carrying out high-temperature thermal treatment to lead the surface coating layer to be completely carbonized so as to form a (the graphite flakes and nanotubes or carbon nanotubes)-silicon (nanometer particles)-carbon (carbon coating layer) composite structural material. According to the preparation method, the carbon fiber-nanometer silicon particle-graphite flake composite material has high mechanical strength; moreover, a lithium battery prepared from the composite material is high in capacity, good in cycle performance and few in charging / discharging time; and on the condition of fast charging-discharging, the capacity fading is low compared with the normal charging and discharging rate.

Description

technical field [0001] The invention relates to the field of lithium-ion battery negative electrode active materials, and more specifically, to a nano-silicon particle-graphite nano-sheet-carbon fiber composite material and a preparation method and application thereof. Background technique [0002] With the miniaturization of various portable electronic devices and the extensive demand for large-capacity and high-power chemical power sources for electric vehicles, exploring high specific capacity, long cycle life, and low-cost lithium-ion battery anode materials has become a research hotspot. At present, the 350mAh / g capacity of graphite anode materials for commercial lithium-ion batteries is close to the theoretical capacity (372mAh / g), and there is not much room for improvement. It is imperative to explore new anode materials. [0003] Compared with the traditional graphite negative electrode, silicon (theoretical capacity 4200mAh / g) has ten times the theoretical capacity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M10/0525Y02E60/10
Inventor 李家晓李钧方岳平
Owner 湖北新南化科技有限公司
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