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A kind of graphene-silicon-based composite negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as large-scale preparation of difficult materials, impact on material conductivity, and danger, and achieve structural stability and cycle performance. Improve conductivity and ensure continuous effect

Active Publication Date: 2021-02-19
SHAANXI COAL & CHEM TECH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concentrated sulfuric acid and potassium permanganate are used to expand the graphite of this material. There is a certain risk in the experiment, and it is difficult to realize the large-scale preparation of the material; the dispersion of silicon and graphite adopts the traditional ultrasonic treatment method, which affects the dispersion of silicon to a certain extent. effect; the entire material preparation process does not add conductive agents, which will inevitably have a certain impact on the conductivity of the material

Method used

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  • A kind of graphene-silicon-based composite negative electrode material for lithium ion battery and preparation method thereof

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preparation example Construction

[0025] The preparation method of graphene-silicon-based composite negative electrode material for lithium ion battery of the present invention comprises the following steps:

[0026] Step 1, adding nano-silicon, graphene, and graphite into a ball mill tank according to a certain proportion and milling for a certain period of time to obtain uniformly mixed material 1;

[0027] Step 2: Add the material 1 and the organic carbon source into the organic solvent, stir and mix, and disperse evenly, then place in a water bath and heat to 70-90°C, heat and stir until the organic solvent evaporates to dryness, and then vacuum-dry at 60-100°C Overnight, material 2 was obtained.

[0028] Step 3: Extrude and granulate the obtained material 2 with a tablet machine, then heat to 150-300°C to maintain a constant temperature, and then heat up to 700-950°C for high-temperature carbonization after the organic carbon source is completely melted to obtain organic cracked carbon Coated graphene-si...

Embodiment 1

[0037] A preparation method of graphene-silicon-based composite negative electrode material of the present invention, comprises the following steps:

[0038] Nano-silicon, graphene, and artificial graphite with a particle size of less than 300nm and a particle size of about 5 μm are added to a ball mill tank according to a certain proportion and ball milled for 300 minutes. The ball-to-material ratio is 10:1, the speed is 500 rpm, and the solid content is 50%. Stir and mix with pitch in ethanol and disperse evenly for 2h afterwards (wherein pitch residual carbon rate is 41%, nano-silicon: graphene: graphite: pitch cracking carbon mass ratio is 45.5:4.5:25:25), in water bath, heat to 70 ℃, heated and stirred until the ethanol evaporated to dryness, and dried under vacuum at 60 ℃ overnight. The mixture is extruded and granulated with a tablet machine, heated to 200°C to maintain a constant temperature for 2 hours, and the heating rate is 5°C / min. After the asphalt is completely ...

Embodiment 2

[0041] A preparation method of graphene-silicon-based composite negative electrode material of the present invention, comprises the following steps:

[0042]Nano-silicon, graphene, and artificial graphite with a particle size of less than 300nm and a particle size of about 5 μm are added to a ball mill tank according to a certain proportion and milled for 180 minutes. The ball-to-material ratio is 6:1, the speed is 500 rpm, and the solid content is 50%. Stir and mix with pitch in ethanol and disperse evenly for 2h afterwards (wherein pitch residual carbon rate is 41%, nano-silicon: graphene: graphite: pitch cracking carbon mass ratio is 45.5:4.5:25:25), heated to 70 in water bath ℃, heated and stirred until the ethanol evaporated to dryness, and dried under vacuum at 60 ℃ overnight. The mixture is extruded and granulated with a tablet machine, heated to 200°C to maintain a constant temperature for 2 hours, and the heating rate is 5°C / min. After the asphalt is completely melted...

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Abstract

The invention provides a graphene-silicon-based composite negative electrode material for lithium ion batteries and a preparation method thereof, comprising the following steps: step 1, ball milling nano-silicon, graphene and graphite to obtain uniformly mixed material 1; step 2, Add material 1 and organic carbon source into the organic solvent, stir to disperse evenly, then heat to 70-90°C, stir until the organic solvent is evaporated, and dry to obtain material 2; step 3, granulate the obtained material 2 , and then heated to 150-300°C and kept at a constant temperature. After the organic carbon source was completely melted, the temperature was raised to 700-950°C for high-temperature carbonization to obtain a graphene-silicon-based composite negative electrode material coated with organic cracked carbon. The invention adopts graphene to prepare graphene-silicon-based composite negative electrode material. The good mechanical properties and flexibility of graphene can relieve the deformation stress of silicon, and the excellent electrical conductivity and thermal conductivity provide rapid electronic conduction and heat dissipation.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a graphene-silicon-based composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries entered practical application in the 1980s. Because of their advantages such as high energy density, long life, and wide operating temperature range, they have been widely used in the market of portable electronic products, such as cameras, power tools, computers, mobile phones, etc. . With the continuous development of society and the continuous rise of the electric vehicle industry, it is particularly urgent to develop lithium-ion batteries with high energy density. [0003] At present, the theoretical specific capacity of the graphite material used in the negative electrode of commercial lithium-ion batteries is only 372mAh / g, and its low capacity limits the further improvement ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/10
Inventor 白杨芝田占元张大鹏曹新龙曹国林邵乐
Owner SHAANXI COAL & CHEM TECH INST
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