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

A lithium-ion battery and silicon dioxide technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as poor cycle performance, difficult industrial production, and complicated preparation processes, and achieve a large expansion coefficient, Large specific surface area, the effect of reducing side reactions

Inactive Publication Date: 2016-08-24
赵晓锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent CN104037396 A discloses a silicon-carbon multi-component composite negative electrode material and its preparation method, which is composed of flexible graphite, nano-silicon and amorphous carbon. The amorphous carbon is obtained by high-temperature pyrolysis of an organic carbon source. Flexible graphite is Expanded graphite is obtained by applying pressure. The prepared silicon-carbon multi-component composite negative electrode material has high capacity, but poor cycle performance and complicated preparation process, making it difficult to industrialize production

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0025] I. Preparation of [carbon nanotube / silica] composite material: Add 120mL ethanol, 40mL distilled water, 1.5mL ammonia water and 0.2mL cetyltrimethylammonium bromide to the reaction vessel and stir evenly to make it fully Dissolve, then add 0.15g acid-treated carbon nanotubes to the reaction vessel and ultrasonically disperse for 40min, after the acid-treated carbon nanotubes are completely dispersed, slowly add 1.0g orthosilicate ethyl ester dropwise to the reaction vessel and Stir at room temperature for 8 hours, then centrifuge and wash the reaction products in the reaction vessel with deionized water and absolute ethanol, and finally dry at 80°C to prepare the [carbon nanotube / silicon dioxide] composite material .

[0026] II. Preparation of silica precursor: put 100g of the [carbon nanotube / silica] composite material prepared in the above I into the reactor and add 50g of asphalt. The speed of the reactor is controlled at 500r / min, and the reaction The fusion tempe...

Embodiment 2

[0029] I. Preparation of [carbon nanotube / silica] composite material: Add 100mL ethanol, 20mL distilled water, 1.0mL ammonia water and 0.1mL cetyltrimethylammonium bromide to the reaction vessel and stir evenly to make it fully Dissolve, then add 0.1g acid-treated carbon nanotubes to the reaction dish and ultrasonically disperse for 40min,

[0030] After the acid-treated carbon nanotubes were completely dispersed, slowly drop 1.0 g of tetraethyl orthosilicate into the reaction vessel and stir for 4 hours at room temperature, and then the reaction products in the reaction vessel were successively washed with deionized water and absolute ethanol respectively. The [carbon nanotube / silicon dioxide] composite material can be prepared by performing centrifugal cleaning and finally drying at 80°C.

[0031] II. Preparation of silica precursor: put 100g of the [carbon nanotube / silica] composite material prepared in the above I into the reactor and add 30g of asphalt. The speed of the r...

Embodiment 3

[0034] I. Preparation of [carbon nanotube / silica] composite material: Add 150mL ethanol, 50mL distilled water, 2.0mL ammonia water and 0.2mL cetyltrimethylammonium bromide to the reaction vessel and stir evenly to make it fully Dissolve, then add 0.2g acid-treated carbon nanotubes to the reaction vessel and ultrasonically disperse for 40min, after the acid-treated carbon nanotubes are completely dispersed, slowly add 1.0g tetraethyl orthosilicate in the reaction vessel and Stir at room temperature for 12 hours, then centrifuge and wash the reaction products in the reaction vessel with deionized water and absolute ethanol in turn, and finally dry at 80°C to prepare the [carbon nanotube / silicon dioxide] composite material .

[0035] II. Preparation of silica precursor: put the 100g [carbon nanotube / silica] composite material prepared in the above I into the reactor and add 60g of asphalt, the speed of the reactor is controlled at 1000r / min, and the reaction The fusion temperatu...

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Abstract

The invention provides a preparation method of a silicon dioxide composite material for a negative electrode of a lithium-ion battery. The method comprises three processes, namely preparation of a [carbon nanotube / silicon dioxide] composite material, preparation of a silicon dioxide precursor and preparation of the silicon dioxide composite material. Ethyl alcohol, distilled water, ammonium hydroxide, hexadecyl trimethyl ammonium bromide, acid-treated carbon nanotube, ethyl orthosilicate, deionized water and absolute ethyl alcohol are utilized in the preparation process of the [carbon nanotube / silicon dioxide] composite material. The carbon nanotube in the prepared silicon dioxide composite material has relatively high conductivity, large specific surface area and relatively large expansion coefficient as an inner core; the expansion effect of the silicon dioxide in the charging and discharging process of the lithium-ion battery can be reduced; the structure stability of the silicon dioxide composite material is improved; and the cycle performance of the silicon dioxide composite material is finally improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery negative electrode materials, in particular to a method for preparing a silicon dioxide composite material for lithium-ion battery negative electrodes. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental friendliness. They have been widely used in the portable mobile electronics market, and have shown attractive application scenarios in transportation and energy storage fields such as electric vehicles and power grid peak regulation. [0003] The current commercial lithium-ion battery anode materials mainly use graphite, and the theoretical specific capacity of graphite is only 372mAh / g, which restricts the practical application of lithium-ion batteries as power batteries in the fields of transportation and energy storage. [0004] Silicon, silicon-based alloys and silicon oxides have high the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李长见
Owner 赵晓锋
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