Micron-sized porous Si/SiO2 composite material as well as preparation method and application thereof
A composite material, micron-scale technology, applied in chemical instruments and methods, silicon compounds, structural parts, etc., can solve problems such as unfavorable industrial production, complex equipment preparation process, and high overall product cost, and achieve excellent electrochemical performance, porosity, etc. The structure is beneficial to solve the effect of volume expansion and contraction
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Embodiment 1
[0033] Mix diatomaceous earth with sodium chloride and magnesium powder at a mass ratio of 1g:1g:1g, add 5mL of absolute ethanol, grind for 0.5h, and vacuum dry to obtain a precursor. The precursor was calcined at 600°C under argon for 1 h, pickled, washed with water, and dried in vacuum; the final product was obtained after secondary acid treatment with hydrofluoric acid for 0.2 h, washed, and dried.
[0034] see figure 1 , figure 1 Si / SiO prepared for Example 1 2 The XRD pattern of the composite material, from which the phase composition can be determined as Si and SiO 2 , the product has high purity and no other impurity phases.
[0035] see figure 2 , figure 2 Be the scanning electron micrograph of embodiment 1 product, wherein the Si / SiO that makes 2 The morphology of the composite material is distinct, and it is in the shape of a porous micron disk with a diameter of about 20 μm.
[0036] see image 3 , image 3 It is the transmission electron microscope pictu...
Embodiment 2
[0040] Mix diatomaceous earth with sodium chloride and magnesium powder at a mass ratio of 1g:1g:3g, add 10mL of absolute ethanol, grind for 1h, and vacuum dry to obtain a precursor. The precursor was calcined at 700°C under nitrogen for 0.5h, pickled, washed with water, and dried in vacuum; the final product was obtained after secondary acid treatment with hydrofluoric acid for 1h, washed, and dried. After testing, it has the same level of electrochemical performance as that of Example 1.
Embodiment 3
[0042] Mix diatomaceous earth with sodium chloride and magnesium powder at a mass ratio of 1g:3g:1g, add 5mL of absolute ethanol, grind for 0.5h, and vacuum dry to obtain a precursor. The precursor was calcined under argon at 500°C for 1 h, pickled, washed with water, and dried in vacuum; the final product was obtained after secondary acid treatment with hydrofluoric acid for 0.3 h, washed, and dried. After testing, it has the same level of electrochemical performance as that of Example 1.
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