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Cotton-shaped nitrogen-doped carbon silicon composite electrode material and in-situ preparation method thereof

A carbon-silicon composite and electrode material technology, which is applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, battery electrodes, etc., can solve the problems of difficult control of the microstructure of composite materials and harsh preparation conditions, and achieve low cost and high conditions. Easy-to-control, fast-response effects

Active Publication Date: 2018-08-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electrochemical performance of silicon / carbon composites has been improved to a certain extent, there are still problems such as the microstructure of the composites is not easy to control and the preparation conditions are harsh. A simple and low-cost method is used to prepare silicon / carbon composites with high electrochemical performance. Carbon anode materials still face many challenges

Method used

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  • Cotton-shaped nitrogen-doped carbon silicon composite electrode material and in-situ preparation method thereof
  • Cotton-shaped nitrogen-doped carbon silicon composite electrode material and in-situ preparation method thereof
  • Cotton-shaped nitrogen-doped carbon silicon composite electrode material and in-situ preparation method thereof

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Effect test

Embodiment 1

[0037] This embodiment provides an in-situ preparation method of a nitrogen-doped flocculent carbon-silicon composite electrode material, which is carried out according to the following steps:

[0038] S01: Weigh 400 mg silicon carbide powder (purity 99.9%, particle size 0.3-4 μm) into a beaker, add 15 mL deionized water and 5 mL ammonia water (analytical grade, Aladdin, 0.91 g mL -1 ) to fully stir to obtain a suspension dispersion;

[0039] S02: Put the above-mentioned suspension and dispersion in an ice-bath ultrasonic tank for ultrasonic dispersion, the ultrasonic power is 80 W, and at the same time, the argon-fluorine laser beam (193 nm) has an energy density of 0.9 J pulse -1 cm -1 , irradiated by a laser with a frequency of 5 Hz for 10 min;

[0040] S03: After the irradiation, freeze-dry the suspension to obtain nitrogen-doped flocculent carbon-silicon composite electrode material.

[0041] figure 1 It is a scanning electron microscope image of the original silicon ...

Embodiment 2

[0048] This embodiment provides an in-situ preparation method of a nitrogen-doped flocculent carbon-silicon composite electrode material, which is carried out according to the following steps:

[0049] S01: Weigh 200 mg silicon carbide powder (purity 99.9%, particle size 0.01-1 μm) into a beaker, add 18 mL deionized water and 2 mL ammonia water (analytical grade, Aladdin, 0.91 g mL -1 ), to obtain a suspension dispersion;

[0050] S02: Put the above-mentioned suspension and dispersion liquid in an ice-bath ultrasonic tank for ultrasonic dispersion, the ultrasonic power is 300 W, and at the same time, the krypton-fluorine laser beam (248 nm) has an energy density of 0.5 J pulse -1 cm -1 , irradiated by laser with a frequency of 8 Hz for 30 min;

[0051] (3) After irradiation, freeze-dry the suspension to obtain nitrogen-doped flocculent carbon-silicon composite electrode material.

[0052] The particle size of silicon particles in the obtained flocculent carbon-silicon compo...

Embodiment 3

[0054] This embodiment provides an in-situ preparation method of a nitrogen-doped flocculent carbon-silicon composite electrode material, which is carried out according to the following steps:

[0055] S01: Weigh 50 mg silicon carbide powder (purity 99.9%, particle size 40-50 μm) into a beaker, add 19 mL deionized water and 1 mL ammonia water (analytical grade, Aladdin, 0.91 g mL -1 ), to obtain a suspension dispersion;

[0056] S02: Put the above-mentioned suspension and dispersion in an ice-bath ultrasonic tank for ultrasonic dispersion, the ultrasonic power is 500 W, and at the same time, the Xenon-Chlorine laser beam (308 nm) has an energy density of 0.9 J pulse -1 cm -1 , irradiated by a laser with a frequency of 10 Hz for 50 min;

[0057] S03: After the irradiation, freeze-dry the suspension to obtain nitrogen-doped flocculent carbon-silicon composite electrode material.

[0058] The particle size of silicon particles in the obtained flocculent carbon-silicon composit...

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Abstract

The invention discloses a cotton-shaped nitrogen-doped carbon silicon composite electrode material and an in-situ preparation method thereof. The in-situ preparation method comprises the steps of focusing a laser beam by a convex lens under an ice bath condition, adding silicon carbide particles into deionized water containing certain ammonium hydroxide to obtain a suspension dispersion liquid used as a liquid-phase target, irradiating under a pulse laser condition, and freezing and drying the suspension liquid after irradiation is completed, thereby obtaining the cotton-shaped nitrogen-dopedcarbon silicon composite electrode material. A high-temperature and high-pressure environment can be generated instantaneously (nanosecond order) by pulse laser, silicon carbide is rapidly broken anddecomposed, carbon atoms and silicon atoms respectively form a cotton-shaped carbon sheet and silicon nanoparticles embedded into the cotton-shaped carbon sheet and nitrogen atom doping, the loosen cotton-shaped morphology is maintained under a rapid cooling effect of an ice bath liquid-phase environment, only one-step in-site laser irradiation is needed, other high-temperature and high-pressure decomposition atmospheres, a reagent and a complicated experiment device are not needed, the process is simple and is low in cost, and the condition is easy to control.

Description

technical field [0001] The invention relates to the technical field of preparation of micro-nano powders, in particular to a nitrogen-doped flocculent carbon-silicon composite electrode material and its in-situ rapid preparation method, in particular to a simple and rapid formation of high-efficiency electrode materials using pulsed laser irradiation technology Electrochemical properties of nitrogen-doped flocculent carbon-silicon composite electrode materials. Background technique [0002] Silicon-based anode materials are considered to be a very promising battery anode material due to their high specific capacity. However, during the charging and discharging process, due to the huge volume change (~300%) of the silicon-based negative electrode material, the electrode material is powdered and agglomerated, and the calcium SEI film formed on the surface of the active material is repeatedly destroyed and grown, resulting in serious capacity loss and poor cycle performance. D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01G11/86H01G11/32
CPCH01G11/32H01G11/86H01M4/362Y02E60/10
Inventor 罗婷曹丙强王丽孙靖
Owner UNIV OF JINAN
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