Preparation method and application of hollow SnO2@C nanosphere in lithium ion battery
A technology of hollow nanometer and nanoparticle, which is applied in the field of nanocomposite materials and its application, to achieve the effect of shortening the reaction steps, slowing down the volume change and large capacity
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Embodiment 1
[0025] Add 60 mL of ethanol, 3 mL of ammonia water and 1 mL of water into a 100 mL flask successively, stir and mix evenly, then slowly add 2.3 mL of tetraethyl orthosilicate (TEOS) dropwise, 20 o C and stirred at constant temperature for 6 h. The resulting solution was centrifuged (7000 rpm, 8 min), washed several times with deionized water and absolute ethanol, and then washed at 50 o C for 10 h. Weigh 1.0 mg of the above oven-dried silica nanoparticles and disperse them in a mixed solution of 3 mL of water and 3 mL of ethanol, and then add 0.24 mL of 0.2 M urea (CH 4 N 2 O) and 0.45 mL 0.08 M sodium stannate (Na 2 SnO 3 h 2 O) was added to the above reaction solution, and after stirring for 0.5 h, the mixture was transferred to a 15 mL hydrothermal reaction kettle. 170 in oven o C for 1 h, naturally cooled to room temperature, centrifuged (7000 rpm, 8 min), and then washed several times with deionized water and absolute ethanol, the obtained solid was 50 o C drying ...
Embodiment 2
[0027] Add 80 mL of ethanol, 4 mL of ammonia water and 1.3 mL of water into a 100 mL flask successively, stir and mix evenly, then slowly add 3.0 mL of tetraethyl orthosilicate (TEOS) dropwise, 20 o C was stirred at constant temperature for 8 h. The resulting solution was centrifuged (7000 rpm, 10 min), washed several times with deionized water and absolute ethanol, and then washed at 60 o C for 10 h. Weigh 1.5 mg of the above dried silica nanoparticles and disperse them in a mixed solution of 3.5 mL of water and 3.5 mL of ethanol, and then add 0.3 mL of 0.2 M urea (CH 4 N 2 O) and 0.5 mL 0.08 M sodium stannate (Na 2 SnO 3 h 2 O) was added to the above reaction solution, and after stirring for 1 h, the mixture was transferred to a 15 mL hydrothermal reaction kettle. 170 in oven o C for 2 h, naturally cooled to room temperature, centrifuged (7000 rpm, 10 min), and then washed several times with deionized water and absolute ethanol, the obtained solid 70 o C dried for 8 ...
Embodiment 3
[0029] Add 70 mL of ethanol, 3.5 mL of ammonia water and 1.1 mL of water into a 100 mL flask successively, stir and mix evenly, then slowly add 2.0 mL of tetraethyl orthosilicate (TEOS) dropwise, 20 o C and stirred at constant temperature for 7 h. The resulting solution was centrifuged (7000 rpm, 9 min), washed several times with deionized water and absolute ethanol, and then washed at 70 o Dry at C for 8 h. Weigh 1.2 mg of the above dried silica nanoparticles and disperse them in a mixed solution of 3.2 mL of water and 3.2 mL of ethanol, and then add 0.22 mL of 0.2 M urea (CH 4 N 2 O) and 0.4 mL 0.08 M sodium stannate (Na 2 SnO 3 h 2 O) was added to the above reaction solution, and after stirring for 0.6 h, the mixture was transferred to a 15 mL hydrothermal reaction kettle. 170 in oven o C for 1.5 h, naturally cooled to room temperature, centrifuged (7000 rpm, 9 min), and then washed several times with deionized water and absolute ethanol, the obtained solid 60 o C d...
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