A kind of carbon-coated nitio3/cnt negative electrode material, preparation and application
A negative electrode material, carbon coating technology, applied in the field of sodium ion battery negative electrode material preparation, can solve the problems of less research on sodium ion battery negative electrode materials, can not meet the high specific capacity materials, low specific capacity, etc., to achieve broad industrial application prospects, Good rate performance and cycle stability, the effect of high tap density
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Embodiment 1
[0068] Multi-walled carbon nanotubes (1-2um in length and 60-100nm in diameter) were treated in 8M concentrated nitric acid solution for 12h, then ultrasonically washed with absolute ethanol and deionized water for 30min, filtered and dried for later use.
[0069] Add 75 mg of acid-treated carbon nanotubes to 50 mL of absolute ethanol, and perform ultrasonic treatment for 30 minutes to obtain a carbon nanotube suspension. Then, 500 mg of PVP (molecular weight: 10100) and 4.5 mL of tetrabutyl titanate were sequentially added to the carbon nanotube suspension, and stirred thoroughly for 1 h to obtain a mixed suspension. 3.291 g of nickel acetate tetrahydrate (titanium / nickel molar ratio 1:1) was dissolved in 30 mL of deionized water to obtain a nickel acetate solution. It was slowly added dropwise to the above mixed suspension, and after continuous stirring for 4 hours, it was transferred to an autoclave and reacted at 200°C for 18 hours. The reaction precipitate was repeatedly...
Embodiment 2
[0076] Take 75 mg of carbon nanotubes that have been acid-treated in advance (see Example 1 for the treatment method), add them to 50 mL of absolute ethanol, and perform ultrasonic treatment for 30 minutes to obtain a suspension of carbon nanotubes. Then, 600mg of PVP (molecular weight: 10100) and 4.5mL of tetrabutyl titanate were sequentially added to the carbon nanotube suspension, and fully stirred for 1 hour to obtain a mixed suspension. 3.291 g of nickel acetate tetrahydrate (titanium / nickel molar ratio 1:1) was dissolved in 40 mL of deionized water to obtain a nickel acetate solution. It was slowly added dropwise to the above mixed suspension, and after continuous stirring for 4 hours, it was transferred to an autoclave and reacted at 200°C for 18 hours. The reaction precipitate was repeatedly washed with absolute ethanol and deionized water, filtered three times, then vacuum-dried at 60°C for 12 hours, and finally the material was placed in a tube furnace for heat treat...
Embodiment 3
[0079] Take 70 mg of carbon nanotubes that have been acid-treated in advance (see Example 1 for the treatment method), add them to 50 mL of absolute ethanol, and perform ultrasonic treatment for 30 minutes to obtain a suspension of carbon nanotubes. Then, 500 mg of PVP (molecular weight: 10100) and 3.5 mL of tetrabutyl titanate were sequentially added to the carbon nanotube suspension, and stirred thoroughly for 2 hours to obtain a mixed suspension. 2.559 g of nickel acetate tetrahydrate (titanium / nickel molar ratio 1:1) was dissolved in 30 mL of deionized water to obtain a nickel acetate solution. It was slowly added dropwise to the above mixed suspension, and after continuous stirring for 3 hours, it was transferred to an autoclave and reacted at 200°C for 18 hours. The reaction precipitate was repeatedly washed with absolute ethanol and deionized water, filtered three times, then vacuum-dried at 60°C for 12 hours, and finally the material was placed in a tube furnace for heat...
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Abstract
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