A carbon dot-based silica composite material and its application in lithium battery electrodes
A carbon dot-based silica and silica technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult dispersion of nano-silica, physical and chemical corrosion, physical agglomeration, etc., and achieve a short preparation cycle. , The steps are simple and the effect of reducing the reunion
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[0040] The preparation method of carbon dot-based silica composite material of the present invention, such as figure 1 As shown, it includes the following steps:
[0041] 1) Preparation of silica nanospheres: add a certain amount of deionized water, ammonia water, silane coupling agent 3-aminopropyl-trimethoxysilane, and tetraethyl orthosilicate to 50 mL of absolute ethanol, React at room temperature for 10 hours, then centrifuge and wash three times with absolute ethanol, and dry at 50°C to obtain silica nanospheres;
[0042] 2) Preparation of carbon dot-based silica composite material: the silica nanospheres obtained in step 1) were calcined at 400°C for 2 hours, cooled to room temperature, and washed with ethanol for three times to obtain carbon dot-based silica composites. Silicon oxide composite.
[0043] The mass ratio of the deionized water, ammonia water, silane coupling agent, tetraethyl orthosilicate and absolute ethanol is 6-7:2:0.1-1.2:2-8:50.
[0044] The appli...
Embodiment 1
[0056] Preparation of blue fluorescent carbon dot-based silica composites with an average particle size of silica nanospheres of 10 nm
[0057] 1) Preparation of silica nanospheres: Add 6ml of deionized water, 2ml of ammonia water, 0.1ml of silane coupling agent 3-aminopropyl-trimethoxysilane, and 2ml of tetraethyl orthosilicate to 50ml of absolute ethanol , reacted at room temperature for 10 hours, then centrifuged and washed three times with absolute ethanol, and dried at 50°C to obtain silica nanospheres;
[0058] 2) Preparation of carbon dot-based silica composite material: the silica nanospheres obtained in step 1) were calcined at 400°C for 2 hours, cooled to room temperature, and washed three times with ethanol to obtain carbon dot-based Silica composite. The carbon dot-based silica composite material can emit weak blue fluorescence under ultraviolet light irradiation, and the average particle size of the silica nanospheres measured under a high-resolution electron mic...
Embodiment 2
[0060] Preparation of blue fluorescent carbon dot-based silica composites with an average particle size of silica nanospheres of 15 nm
[0061] 1) Preparation of silica nanospheres: Add 6ml deionized water, 2ml ammonia water, 0.17ml silane coupling agent 3-aminopropyl-trimethoxysilane, 5ml tetraethyl orthosilicate to 50ml absolute ethanol , reacted at room temperature for 10 hours, then centrifuged and washed three times with absolute ethanol, and dried at 50°C to obtain silica nanospheres;
[0062] 2) Preparation of carbon dot-based silica composite material: the silica nanospheres obtained in step 1) were calcined at 400°C for 2 hours, cooled to room temperature, and washed three times with ethanol to obtain carbon dot-based Silica composite. The carbon dot-based silica composite material can emit strong blue fluorescence under ultraviolet light irradiation, and the average particle size of the silica nanospheres measured under a high-resolution electron microscope is 15nm....
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