Graphene/silicon composite material, preparation method thereof and lithium ion battery

A silicon composite material and graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high initial discharge specific capacity and poor cycle performance of porous graphene/silicon composite materials, and achieve tap density And the specific surface area is improved, the liquid absorption and liquid retention capacity is improved, and the liquid retention capacity is high.

Active Publication Date: 2018-04-20
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous graphene / silicon composite material obtained by this patented method has a high initial discharge specific capacity, but its cycle performance is not good

Method used

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  • Graphene/silicon composite material, preparation method thereof and lithium ion battery
  • Graphene/silicon composite material, preparation method thereof and lithium ion battery
  • Graphene/silicon composite material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the graphene / silicon composite material of the present embodiment comprises the following steps:

[0037] 1) Preparation of hydrogel

[0038] Add 20g of 3-aminopropyltriethoxysilane to 1000mL of graphene oxide solution with a concentration of 5mg / mL. After stirring evenly, add 3g of melamine and ultrasonically disperse it evenly. React for 3h, then filter to obtain block hydrogel A;

[0039] 2) vacuum freeze drying

[0040] Place the bulk hydrogel A in a vacuum freeze dryer, evacuate to 20Pa, then cool down the vacuum drying oven to -40°C and keep it warm for 24 hours, then rise to room temperature, crush the material, and briquette to obtain material B;

[0041] 3) Thermal reduction

[0042]Place the material B in a tube furnace, under the protection of argon, raise the temperature to 350°C at a rate of 5°C / min and keep it for 3 hours, then raise the temperature to 850°C at a rate of 5°C / min and keep it for 3 hours, then naturally Cool dow...

Embodiment 2

[0046] The preparation method of the graphene / silicon composite material of the present embodiment comprises the following steps:

[0047] 1) Preparation of hydrogel

[0048] Add 10g of diethylenetriaminopropyltrimethoxysilane to 1000mL of graphene oxide solution with a concentration of 1mg / mL, stir evenly, then add 1g of ammonia water and ultrasonically disperse evenly, then transfer to an autoclave, and React at a temperature of 120°C for 1 hour, and then filter to obtain block hydrogel A;

[0049] 2) vacuum freeze drying

[0050] Put the bulk hydrogel A in a vacuum freeze dryer, evacuate to 5Pa, then cool down the vacuum drying oven to -60°C and keep it warm for 6 hours, then raise the temperature to room temperature, and then crush and briquette the material to obtain the material B;

[0051] 3) Thermal reduction

[0052] Put material B in a tube furnace, under the protection of argon, raise the temperature to 300°C at a rate of 1°C / min and keep it for 1 hour, and then...

Embodiment 3

[0056] The preparation method of the graphene / silicon composite material of the present embodiment comprises the following steps:

[0057] 1) Preparation of hydrogel

[0058] Add 30g of phenyltris(methyl ethyl ketone oxime) silane to 1000mL of graphene oxide solution with a concentration of 10mg / mL, stir evenly, add 5g of pyrrole and ultrasonically disperse evenly, then transfer to the autoclave, And react at a temperature of 150°C for 6 hours, and then filter to obtain block hydrogel A;

[0059] 2) vacuum freeze drying

[0060] Place the bulk hydrogel A in a vacuum freeze dryer, evacuate to 50Pa, then cool down the vacuum drying oven to -20°C and keep it warm for 48 hours, and finally raise the temperature to room temperature, crush the material, briquette the material, and obtain the material B;

[0061] 3) Thermal reduction

[0062] Put material B in a tube furnace, and under the protection of argon, raise the temperature to 400°C at a rate of 10°C / min and keep it for 6...

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Abstract

The invention relates to a graphene / silicon composite material, a preparation method thereof and a lithium ion battery, and belongs to the field of preparation of a lithium ion battery material. The preparation method of the graphene / silicon composite material comprises the following steps of 1) performing reaction of a silane compound, a graphene oxide solution and a nitrogen source for 1-6 hoursunder 120-150 DEG C to obtain hydrogel A, wherein the mass ratio of the silane compound, the graphene oxide solution and the nitrogen source is (10-30):(1-10):(1-5); 2) performing vacuum freezing anddrying on the hydrogel A to obtain a material B; and 3) performing heat preservation on the material B for 1-6 hours under an inert atmosphere, and performing heat preservation for 1-6 hours at 800-900 DEG C, and performing cooling, thereby obtaining the graphene / silicon composite material. In the graphene / silicon composite material obtained by the preparation method, the tap density and the specific area are obviously improved, and the graphene / silicon composite material has a good application prospect in the field of lithium battery preparation.

Description

technical field [0001] The invention relates to a graphene / silicon composite material, a preparation method thereof, and a lithium ion battery, belonging to the field of lithium ion battery material preparation. Background technique [0002] As the market's requirements for the mileage of electric vehicles increase, the lithium-ion batteries equipped with electric vehicles are required to have higher energy density to meet market requirements, and the negative electrode material is the key material for lithium-ion batteries. The energy density, safety performance and service life of lithium-ion batteries have an important impact. At present, the anode materials of lithium-ion batteries used in the market are mainly graphite materials, but their low gram capacity limits the improvement of the energy density of lithium-ion batteries. Silicon-carbon anode materials have attracted the attention of researchers due to their high gram capacity and abundant resources, and have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 赵晓锋李利淼怀永建仝俊利支岩辉
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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