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A kind of porous film electrode material and preparation method thereof

A technology of electrode material and porous film, applied in the field of porous film electrode material and its preparation, and porous film negative electrode material, can solve the problems of high cost, complex preparation of nanostructures, poor cycle performance of lithium-ion battery negative electrode, etc., to achieve easy operation and simplification The method of preparation, the effect of facilitating quality control

Active Publication Date: 2019-06-28
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a porous thin film electrode material and a preparation method thereof, wherein the key process flow design, the component distribution ratio of the precursor solution, etc. are improved (especially for the The specific steps of the preparation method and the components and structures in the product are studied and designed), compared with the prior art, it can effectively solve the problems of poor cycle performance of silicon-based materials as lithium-ion battery negative electrodes, complex preparation of nanostructures and high cost, and , the prepared porous thin film electrode material (i.e., silicon / carbon composite electrode) is a porous thin film electrode material with lithium-ion battery activity, has good cycle performance and rate performance, and the porous thin film electrode material also has Nearly 1000mA h g –1 The reversible capacity and cycle performance are greatly improved, especially for lithium-ion batteries and as negative electrode materials

Method used

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  • A kind of porous film electrode material and preparation method thereof
  • A kind of porous film electrode material and preparation method thereof
  • A kind of porous film electrode material and preparation method thereof

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preparation example Construction

[0036] The preparation method of the porous film electrode material of lithium ion battery in the present invention generally comprises the following steps:

[0037] (a) Disperse the silicon powder in a certain amount of ethanol, and process it with ultrasonic stirring to form a homogeneous liquid A;

[0038](b) dissolving the organic polymer (such as polymethyl methacrylate PMMA) in an organic solvent (dimethylformamide DMF) to form a homogeneous solution B;

[0039] (c) uniformly mixing a certain proportion of A and B to form a uniform liquid C, and ultrasonically stirring for a certain period of time;

[0040] (d) Add a certain amount of GO solution into C, and ultrasonically disperse to form a homogeneous liquid D;

[0041] (e) Pour the homogeneous liquid D into a petri dish, and dry it in a blast drying oven to form a thin film. The temperature of the drying oven is 40-200°C;

[0042] (f) Sintering the film obtained above in an inert atmosphere at a temperature of 100-1...

Embodiment 1

[0047] Weigh 54mg of Si powder and ultrasonically disperse it into 20mL ethanol to form solution A, dissolve 17mg PMMA into 10mL DMF to form solution B, mix the above solutions A and B evenly to form solution C, and uniformly mix 54mg GO aqueous solution with solution C to form solution D. Pour solution D into a petri dish, put it in an oven at 80°C and dry it to obtain a film, and put the obtained film in Ar / H 2 , heat treatment at 500 °C to obtain porous Si@rGO films.

Embodiment 2

[0049] Weigh 54mg of Si powder and ultrasonically disperse it into 20mL ethanol to form solution A, dissolve 11mg PMMA into 10mL DMF to form solution B, mix the above solutions A and B evenly to form solution C, and uniformly mix 54mg GO aqueous solution with solution C to form solution D. Pour solution D into a petri dish, put it in an oven at 80°C and dry it to obtain a film, and put the obtained film in Ar / H 2 , heat treatment at 500 °C to obtain porous Si@rGO films.

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Abstract

The invention discloses a porous thin-film electrode material and a preparation method thereof. The preparation method comprises the following steps of dispersing silicon powder into ethanol and an organic polymer material into an organic solvent separately and mixing the ethanol with the organic solvent evenly; adding a graphene oxide solution to the mixture for dispersing evenly to obtain a precursor solution; putting the precursor solution into a mold container and carrying out drying to form a thin film; and sintering the thin film in a mixed atmosphere of a carrier gas and a reducing gas at a temperature of 100-1,000 DEG C to obtain the porous thin-film electrode material. Through improvement of a key process design, component proportions of the precursor solution and the like, the problems of poor cyclicity of a silicon-based material as a negative electrode of a lithium-ion battery, complicated nano-structure preparation and relatively high cost can be effectively solved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically relates to a porous thin-film electrode material and a preparation method thereof. The porous thin-film electrode material is especially a porous thin-film negative electrode material that can be used for lithium-ion batteries. Background technique [0002] With the development and utilization of new energy sources, the limitations of energy sources (such as intermittent and regional) are gradually revealed, and energy storage and deployment are becoming increasingly important. At present, the energy storage devices used commercially are mainly lithium-ion batteries, and the negative electrode materials mainly use carbon materials. However, due to the development of electric vehicles and other equipment, the demand for energy density of batteries has been greatly increased, and carbon materials cannot meet commercial needs gradually. The next generation of high specific ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M2004/021Y02E60/10
Inventor 胡先罗赵前进黄云辉
Owner HUAZHONG UNIV OF SCI & TECH