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A self-supporting silicon carbon negative electrode material and preparation method thereof

A negative electrode material, self-supporting technology, applied in negative electrodes, nanotechnology for materials and surface science, battery electrodes, etc., can solve the problems of low Coulombic efficiency, poor cycle performance, poor electrochemical performance of batteries, etc. Cycle performance, low cost, and the effect of improving discharge specific capacity

Active Publication Date: 2021-07-27
四川瑞鞍新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a self-supporting silicon-carbon negative electrode material and its preparation method, which solves the problems of low coulombic efficiency, poor cycle performance and the need to add binders and collectors in existing carbon negative electrode materials. Fluid and other inactive components lead to problems such as poor electrochemical performance of the battery

Method used

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  • A self-supporting silicon carbon negative electrode material and preparation method thereof
  • A self-supporting silicon carbon negative electrode material and preparation method thereof
  • A self-supporting silicon carbon negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] 1) Add 8.7 g DMF to the beaker, then add 1.3 g PAN for ultrasonic dispersion, then place the above mixture in a 60°C oil bath and stir for 6 h at a constant temperature. After the PAN is completely dissolved, the spinning solution is obtained;

[0046] 2) Use a 20 ml syringe to absorb the spinning solution obtained in step 1) and place it in the container loading device of the electrospinning machine, fix it on the injection flow rate controller, turn on the electrospinning equipment, and set the electrospinning process parameters: spinning Temperature 45 ℃, humidity 36%, 22 G needle, voltage 23 Kv, speed 200r / min, flow rate 2 ul / min, the distance between the needle and the receiving plate was 21 cm, and then electrospinning was carried out to obtain composite nanofibers.

[0047] 3) Place the composite nanofibrous membrane obtained in step 2) in a 60 °C forced air drying oven for 6 h to remove the solvent, then cut it into a square piece of 5×9 cm, and then use it on a ...

Embodiment 2

[0049] 1) Accurately weigh 0.025 g of nano-silicon powder into a 50 ml small beaker, add an appropriate amount of KH580 dropwise to soak the nano-silicon powder, then add 8.7 g of DMF and ultrasonically disperse for 20 min, add 1.3 g of PAN, and place at 60 °C Stir in the oil bath at constant temperature for 6 h, and after the PAN is completely dissolved, a brown emulsion is obtained, which is the spinning solution;

[0050] 2) Use a 20 ml syringe to absorb the spinning solution obtained in step 1) and place it in the container loading device of the electrospinning machine, fix it on the injection flow rate controller, turn on the electrospinning equipment, and set the electrospinning process parameters: spinning Temperature 45 ℃, humidity 36%, 22 G needle, voltage 23 Kv, rotation speed 200r / min, flow rate 2 ul / min, the distance between the needle and the receiving plate was 21 cm, and then electrospinning was carried out to obtain Si 0.025 / PAN composite nanofibers.

[0051]...

Embodiment 3

[0053] 1) Accurately weigh 0.05 g of nano-silicon powder into a 50 ml small beaker, add an appropriate amount of KH580 dropwise to soak the nano-silicon powder, then add 8.7 g of DMF and ultrasonically disperse for 20 min, add 1.3 g of PAN, and place at 60 °C Stir in the oil bath at constant temperature for 6 h, and after the PAN is completely dissolved, a brown emulsion is obtained, which is the spinning solution;

[0054] 2) Use a 20 ml syringe to absorb the spinning solution obtained in step 1) and place it in the container loading device of the electrospinning machine, fix it on the injection flow rate controller, turn on the electrospinning equipment, and set the electrospinning process parameters: spinning Temperature 45 ℃, humidity 36%, 22 G needle, voltage 23 Kv, rotation speed 200r / min, flow rate 2 ul / min, the distance between the needle and the receiving plate was 21 cm, and then electrospinning was carried out to obtain Si 0.05 / PAN composite nanofibers.

[0055] 3...

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Abstract

The invention discloses a self-supporting silicon-carbon negative electrode material and a preparation method thereof. The invention adopts a uniaxial electrostatic spinning method to prepare a nanofiber film, and then dries, heats and carbonizes the film. The prepared self-supporting silicon-carbon anode material is a composite material of composite nanofibers and carbon, and has a three-dimensional network structure, which can not only improve the dispersion of nano-silicon, but also effectively alleviate the volume change of silicon, and can also form a conductive network. Facilitate the transfer of electrons and ions. The method is simple in operation, stable, continuous, controllable, low in energy consumption and low in cost. The prepared self-supporting silicon-carbon anode material can be directly used as a lithium-ion battery, and it exhibits better cycle performance in the Si / C battery anode, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a self-supporting silicon-carbon negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are regarded as green energy in the new century because of their advantages such as high energy density, long service life, environmental friendliness, wide allowable operating temperature range, green environmental protection and no memory effect. Currently, they are widely used in energy storage systems for smartphones, small aircraft, and new energy vehicle tools. However, when graphite is used as an anode material for lithium-ion batteries, its theoretical specific capacity is low (372 mA h / g). And its poor rate performance limits its long-term application in electric vehicles and energy storage systems, and cannot meet the growing demand for large-capacity electrochemical energy storage. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525B82Y30/00B82Y40/00D01D5/00D04H1/4382D04H1/728D06C7/04
CPCB82Y30/00B82Y40/00D01D5/0092D04H1/4382D04H1/728D06C7/04H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈建卿龙唐成玉李瑞何宇雷智强刘平李琳龚勇
Owner 四川瑞鞍新材料科技有限公司
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