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Graphene/silicone/carbon nano tube composite material and preparation method and application thereof

A technology of carbon nanotube composite and silicon-carbon composite materials, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that hinder industrialization, low intrinsic conductivity, poor cycle stability, etc. problem, to achieve the effect of improving conductivity, high capacity and high efficiency

Inactive Publication Date: 2016-05-11
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the physical and chemical characteristics of the silicon material itself, there are also some problems when it is used as an anode material for lithium-ion batteries: First, the silicon material is accompanied by a larger volume change during the intercalation and deintercalation of lithium, resulting in its cycle stability. poor
Secondly, the low intrinsic conductivity of silicon powder also easily leads to the polarization of electrodes.
These problems directly hinder its industrial application

Method used

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  • Graphene/silicone/carbon nano tube composite material and preparation method and application thereof
  • Graphene/silicone/carbon nano tube composite material and preparation method and application thereof
  • Graphene/silicone/carbon nano tube composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add 0.15g of graphene and 0.45g of carbon nanotube powder into 300ml of NMP solution, and ultrasonically vibrate for 1h until the dispersion is uniform. Add 2.4g of nano-silica powder into the above solution, and ultrasonically stir to disperse evenly. Then the mixed solution was spray-dried by a spray-drying method, and moved to a vacuum oven at 100° C. for drying and grinding to obtain a graphene / silicon / carbon nanotube (carbon fiber) composite negative electrode material.

[0025] The anode material prepared above, the binder CMC, and the conductive agent acetylene black were mixed in a ratio of 70:15:15 and ball-milled, evenly coated on the surface of copper foil, and dried at 80°C to obtain an electrode sheet. The above-mentioned electrode sheet is made of a lithium sheet as a counter electrode, ethyl carbonate (EC) and dimethyl carbonate (DMC) are dissolved in 1mol / LLiPF6 with a volume ratio of 1:1, and 10% FEC is added as an electrolyte to make a button battery. ...

Embodiment 2

[0027] Add 0.3g of graphene and 0.3g of carbon nanotube powder into 300ml of NMP solution, and ultrasonically vibrate for 1h until the dispersion is uniform. Add 2.4g of nano-silica powder into the above solution, and ultrasonically stir to disperse evenly. Then the mixed solution was spray-dried by a spray-drying method, and moved to a vacuum oven at 100° C. for drying and grinding to obtain a graphene / silicon / carbon nanotube (carbon fiber) composite material. Referring to Example 1, lithium-ion battery preparation and electrochemical performance testing were carried out.

Embodiment 3

[0029] Add 0.15g of graphene and 0.15g of carbon nanotube powder into 300ml of NMP solution, and ultrasonically vibrate for 1h until the dispersion is uniform. Add 2.7g of nano-silica powder into the above solution, and ultrasonically stir to disperse evenly. Then the mixed solution was spray-dried by a spray-drying method, and moved to a vacuum oven at 100° C. for drying and grinding to obtain a graphene / silicon / carbon nanotube (carbon fiber) composite material. Referring to Example 1, lithium-ion battery preparation and electrochemical performance testing were carried out.

[0030] The invention uses graphene to compound silicon material, carbon nanotube or carbon fiber. Graphene, carbon nanotubes or carbon fibers and silicon originate from water or organic solution (such as N-methyl dipyrrolidone, NMP) and disperse them evenly with ultrasonic stirring, then carry out spray drying to obtain the described graphene / silicon / carbon nanotubes ( carbon fiber) composite anode mat...

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Abstract

The invention discloses a graphene / silicone / carbon nano tube composite material and a preparation method and application thereof and relates to lithium ion battery silicone cathode materials. The graphene / silicone / carbon nano tube composite material is a silicone-carbon composite material compositing graphene, a silicone material and carbon nano tubes. The preparation method includes: adding graphene powder and the carbon nano tubes into an NMP solution, adopting ultrasonic oscillation to enable uniform dispersion of the graphene powder and the carbon nano tubes, adding nano silicone powder, and adopting ultrasonic oscillation to enable uniform dispersion; drying, stoving and grinding a mixed solution obtained to obtain the graphene / silicone / carbon nano tube composite material. The graphene / silicone / carbon nano tube composite material can serve as a cathode material to be applied in lithium ion batteries and has characteristics of high capacity, high efficiency and good circulating performance. Graphene, the silicone material and the carbon nano tubes are composited through simple steps, volume effect of the silicone material in the process of charging and discharging is improved through graphene and special structure of a novel material, and electroconductivity of the silicone material is improved.

Description

technical field [0001] The invention relates to a silicon negative electrode material for a lithium ion battery, in particular to a graphene / silicon / carbon nanotube composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are increasingly in demand as power sources for portable electronic devices, electric vehicles, and hybrid vehicles due to their high energy density and stable cycle performance. The main idea of ​​developing a power lithium-ion battery with higher power density and energy density, suitable for fast charging and discharging, and a lithium-ion battery with longer battery life is to find new positive and negative electrode materials, so that the battery has a higher lithium-ion capacity. Intercalation volume and better delithiation reversibility to ensure high voltage, large capacity and long cycle life of the battery. The current commercial lithium-ion battery negative electrode material uses g...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/386H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 龚正良高天一汪琰聂飞燕方崇卿赵立平
Owner XIAMEN UNIV
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