Lithium ion anode material SiO2@SnO2 with coated structure and preparation method and application thereof
A technology of negative electrode material and coating structure, which is applied in the field of SiO2@SnO2 coating structure lithium ion negative electrode material and its preparation, can solve the problems of poor conductivity, poor battery cycle performance, cracking and the like, and achieves a simple preparation process and good cycle performance. Effect
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[0027] Example 1
[0028] (1) Weigh 200nm SiO 2 0.1g of powder; added to 160mL of absolute ethanol and ultrasonically dispersed for 60min to obtain a mixed solution;
[0029] (2) Weigh 0.8 g of tin tetrachloride pentahydrate, add it to the mixed solution, and stir it magnetically for 5 minutes at room temperature;
[0030] (3) Pour the mixed solution into a stainless steel autoclave lined with polytetrafluoroethylene, then put it in a vacuum drying oven, and hydrothermally react at 160℃ for 12h;
[0031] (4) After the temperature of the reactor is lowered to room temperature, collect the product by centrifugation, and wash it twice with absolute ethanol;
[0032] (5) SiO is obtained after drying at 90℃ for 20h 2 @SnO 2 Coated structure lithium ion anode material.
[0033] The composition and structure of the composite material were determined by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the morphological characteristics of the composite material were observe...
Example Embodiment
[0034] Example 2
[0035] (1) Weigh 200nm SiO 2 0.1g powder to obtain a mixed powder; add it to 160mL of absolute ethanol, and ultrasonically disperse for 30 minutes to obtain a mixed solution;
[0036] (2) Weigh 0.8 g of tin tetrachloride pentahydrate, add it to the mixed solution, and stir it magnetically for 15 minutes at room temperature;
[0037] (3) Pour the mixed solution into a stainless steel autoclave lined with polytetrafluoroethylene, then put it in a vacuum drying oven, and hydrothermally react at 180℃ for 16h;
[0038] (4) After the temperature of the reaction kettle is lowered to room temperature, the product is collected by centrifugation and washed with absolute ethanol;
[0039] (5) SiO is obtained after drying at 85℃ for 24h 2 @SnO 2 Coated structure lithium ion anode material.
[0040] The composition and structure of the composite material were determined by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the morphological characteristics of t...
Example Embodiment
[0041] Example 3
[0042] (1) Weigh 200nm SiO 2 0.1g powder to obtain a mixed powder; add it to 160 mL of absolute ethanol, and ultrasonically disperse for 90 min to obtain a mixed solution;
[0043] (2) Weigh 0.8 g of tin tetrachloride pentahydrate, add it to the mixed solution, and stir it magnetically for 10 minutes at room temperature;
[0044] (3) Pour the mixed solution into a stainless steel autoclave lined with polytetrafluoroethylene, then put it in a vacuum drying oven, and hydrothermally react at 200°C for 24 hours;
[0045] (4) After the temperature of the reaction kettle is lowered to room temperature, the product is collected by centrifugation and washed with absolute ethanol;
[0046] (5) SiO is obtained after drying at 95℃ for 10h 2 @SnO 2 Coated structure lithium ion anode material.
[0047] The composition and structure of the composite material were determined by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the morphological characteristics o...
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