Preparation method of silicon-carbon composite material for lithium ion battery

A silicon-carbon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high requirements for equipment and gas purity, unsuitable for large-scale production applications, and slow product deposition rates. Improve the mixing effect, excellent battery cycle performance, and facilitate the effect of insertion and extraction

Active Publication Date: 2020-03-27
INNER MONGOLIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although this method can improve the conductivity of the electrode material, it consumes a lot of energy, and the silicon powder and carbon powder are simply mixed together. After many cycles, the collapse of the material structure caused by the volume expansion of silicon is still unavoidable. and the problem of peeling off of the active material from the current collector
[0006] Chinese patent CN107528055A provides a method for preparing silicon-carbon composite materials by chemical vapor deposition. The reaction temperature is as high as thousands of degrees, the energy consumption is high, the equipment and gas purity are high, the product deposition rate is slow, and it is not suitable for large-scale production. application

Method used

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  • Preparation method of silicon-carbon composite material for lithium ion battery
  • Preparation method of silicon-carbon composite material for lithium ion battery
  • Preparation method of silicon-carbon composite material for lithium ion battery

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preparation example Construction

[0039] figure 1 It is a flow chart of a method for preparing a silicon-carbon composite material for a lithium-ion battery according to an embodiment of the present invention. The diagram shows a method for preparing a silicon-carbon composite material for a lithium-ion battery, comprising the following steps:

[0040] Step S01 dispersing the silicon source and template in an organic solvent to obtain an organic slurry;

[0041] Step S02 using a spray gun to spray the organic slurry into the solution to form an organic slurry solution, adding a carbon source to the filtered and washed organic slurry solution, and then separating the solid from the liquid and drying to obtain a precursor;

[0042] Step S03 Calcining the precursor under an inert gas to obtain the silicon-carbon composite material for lithium-ion batteries.

[0043]Embodiments of the present invention form fine and uniform mist droplets by the spray gun, and then spray into the solution, because the organic sol...

Embodiment 1

[0046] A method for preparing a silicon-carbon composite material for a lithium-ion battery, comprising the steps of:

[0047] Step S1-1. Weigh 50 g of nano-silicon oxide particles (with a particle size of 100 nm) and 32 g of polymethyl methacrylate (a type of acrylic resin) respectively, and ultrasonically disperse them at a ratio of 6 wt% solid content Forming an organic slurry in N,N-dimethylformamide;

[0048] Step S1-2, using a spray gun to spray the organic slurry into water to form an organic slurry solution, the atomization pressure of the spray gun is 0.1 Mpa, the spray width pressure is 0.3 Mpa, and the organic slurry is stirred within 30 minutes from the start of spraying to the end of spraying material solution; in the filtered and washed organic slurry solution, add 100 g citric acid solution (5% by mass) and mix well, then slowly add pyridine to adjust the pH value to 8.0, and then obtain the precursor by vacuum filtration and vacuum drying body;

[0049] Step ...

Embodiment 2

[0051] A method for preparing a silicon-carbon composite material for a lithium-ion battery, comprising the steps of:

[0052] Step S2-1. Weigh 50 g of nanometer elemental silicon particles (with a particle size of 80 nm) and 20 g of bisphenol A epoxy resin (a type of epoxy resin), and weigh them in proportions with a solid content of 5 wt%. Ultrasonic dispersion in N-methylpyrrolidone to form an organic slurry;

[0053] Step S2-2, using a spray gun to spray the organic slurry into absolute ethanol, the atomization pressure of the spray gun is 0.06 Mpa, the spray width pressure is 0.25 Mpa, and the organic slurry solution is stirred within 30 minutes from the start of spraying to the end of spraying; Add 100 g of starch solution (3% by mass) to the filtered and washed organic slurry solution and mix well, then slowly add N, N-dimethylaniline to adjust the pH value to 8.5, and then vacuum filter and vacuum dry to obtain Precursor;

[0054] Step S2-3, calcining the precursor a...

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Abstract

The invention discloses a preparation method of a silicon-carbon composite material for a lithium ion battery, which comprises the following steps: step A, dispersing a silicon source and a template agent in an organic solvent to obtain organic slurry; step B, spraying the organic slurry into the solution by using a spray gun to form an organic slurry solution, adding a carbon source into the filtered and washed organic slurry solution, and performing solid-liquid separation and drying to obtain a precursor; and step C, calcining the precursor under inert gas to obtain the silicon-carbon composite material for the lithium ion battery. The composite material prepared by the preparation method disclosed by the invention has the advantages that carbon is uniformly distributed on the surface of silicon or among silicon particles, the volume effect of silicon in the charging and discharging process can be effectively reduced, and the conductivity of an electrode material is improved, so that the capacity and the cycle performance of the lithium ion battery are obviously improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a silicon-carbon composite material for lithium-ion batteries. Background technique [0002] As a result of climate change and the reduction of oil costs, society is required to turn to the development and utilization of sustainable and renewable resources. As an important energy storage element, lithium-ion batteries have attracted widespread attention and applications due to their outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge capacity, and no memory effect. [0003] At present, the anode materials of commercial lithium-ion batteries are generally carbon materials. Although they have low and stable working potential and good cycle performance, the specific capacity of carbon materials is low (for example, the theoretical specific capacity of graphite is 372 mAh / g), This limits ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 楠顶张文博徐静郭洪飞董俊慧白亮刘军刘景顺何智慧
Owner INNER MONGOLIA UNIVERSITY
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