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

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of powdering nano-silicon particle materials, long diffusion and migration paths, and poor electrode conductivity, and achieves a small particle size. , Improve the electrochemical activity, the effect of uniform particle size

Active Publication Date: 2018-11-30
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to provide a preparation method of a nano-silicon-carbon composite negative electrode material for a lithium-ion battery, which solves the long diffusion migration path of the exist

Method used

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

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Embodiment 1

[0034] 1) Accurately weigh 2.8g of polyacrylonitrile (PAN) powder, 14.4g of N,N-dimethylformamide (DMF) in a 50ml small beaker, and place it in an oil bath at 50°C for 3h at constant temperature, After the PAN powder is completely dissolved, ultrasonically disperse for 4 hours to obtain an outer layer precursor emulsion with a concentration of 14%, which is ready for use;

[0035] 2) Accurately weigh 0.4g of nano silicon powder (30nm) and 0.03g of Y-aminopropyltriethoxysilane (KH550) and soak in a 50ml small beaker for 5min, then add 2.6g of polymethyl methacrylate (PMMA) After powder and 17.4g N,N-dimethylformamide (DMF), it was placed in a 35°C oil bath and stirred at a constant temperature for 3 hours. After the PMMA powder was completely dissolved, it was ultrasonicated for 2 hours to obtain a concentration of 13%. Inner layer precursor emulsion, ready for use;

[0036] 3) Select two 20ml syringes to absorb the inner layer emulsion and the outer layer emulsion respectivel...

Embodiment 2

[0041] 1) Accurately weigh 2.8g of polyacrylonitrile (PAN) powder, 14.4g of N,N-dimethylformamide (DMF) in a 50ml small beaker, and place it in an oil bath at 50°C for 3h at constant temperature, After the PAN powder is completely dissolved, ultrasonically disperse for 4 hours to obtain an outer layer precursor emulsion with a concentration of 14%, which is ready for use;

[0042] 2) Accurately weigh 0.4g of nano silicon powder (30nm) and 0.03g of Y-aminopropyltriethoxysilane (KH550) and soak in a 50ml small beaker for 5min, then add 2.8g of polyacrylonitrile (PAN) powder, After 14.4g of N,N-dimethylformamide (DMF), it was placed in a 50°C oil bath and stirred at a constant temperature for 3 hours. After the PAN powder was completely dissolved, it was sonicated for 2 hours to obtain an inner layer precursor with a concentration of 14%. Body emulsion, ready to use;

[0043] 3) Select two 20ml syringes to absorb the inner layer emulsion and the outer layer emulsion respectively...

Embodiment 3

[0048] 1) Accurately weigh 2.8g of polyvinylidene fluoride (PVDF) powder, 14.4g of N,N-dimethylformamide (DMF) in a 50ml small beaker, and place it in a 35°C oil bath and stir for 3h After the PVDF powder is completely dissolved, ultrasonically disperse for 4 hours to obtain an outer layer precursor emulsion with a concentration of 14%, which is ready for use;

[0049] 2) Accurately weigh 0.4g of nano silicon powder (30nm) and 0.03g of Y-aminopropyltriethoxysilane (KH550) and soak in a 50 ml small beaker for 5min, then add 2.6g of polymethyl methacrylate (PMMA) After the powder and 17.4g N,N-dimethylformamide (DMF), it was placed in a 35°C oil bath and stirred at a constant temperature for 3 hours. After the PMMA powder was completely dissolved, it was ultrasonically used for 2 hours to obtain a concentration of 12%. Inner layer precursor emulsion, ready for use;

[0050] 3) Select two 20ml syringes to absorb the inner layer emulsion and the outer layer emulsion respectively,...

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Abstract

The invention discloses a preparation method of a nanometer silicon-carbon composite negative electrode material for a lithium ion battery. The preparation method comprises: preparing fiber filamentsfrom an inner layer precursor emulsion and an outer layer precursor emulsion through a coaxial electrospinning technique, and carrying out load freeze-drying-load hot pressing-load heat treatment andtwo carbonization treatment processes to obtain the nanometer silicon-carbon composite negative electrode material. The nanometer silicon-carbon composite negative electrode material has small and even fiber diameters and a large specific surface area. The load heat treatment reduces the thickness of the carbon layer. The nanometer silicon carbon composite negative electrode material has a good specific capacity and cycle performances. The preparation method effectively shortens the diffusion path of lithium ions and solves the problem that the nanometer silicon particles are pulverized through the volume expansion effect and are easy to collapse. The preparation method 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 method for preparing a nano-silicon-carbon composite negative electrode material for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as large capacity, high working voltage, long cycle life, strong nuclear power retention capability, wide allowable operating temperature range, green environmental protection and no memory effect. Now they have been widely used in electronic products. The annual market size will reach 1193.1 billion US dollars. Therefore, lithium-ion batteries have broad prospects for energy storage and electric vehicles. [0003] However, at present, the internal impedance of lithium-ion batteries is high, the operating voltage varies greatly, and the cost is high. Special protection circuits are necessary, and the power density and capacity for pure electric vehicles need to ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 陈建刘平李琳龚勇周孝林辜其隆
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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