A kind of preparation method of lithium vanadate/carbon nanotube/carbon of negative electrode composite material of lithium ion battery
A technology of lithium-ion batteries and carbon nanotubes, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable large-scale industrialization, poor electronic conductivity, and influence on electrochemical performance, so as to improve electrochemical performance, Improvement of electron conductivity and effect of shape suppression
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Embodiment 1
[0028] 1. Weigh 0.5g of carbon nanotubes and add it to 200mL of 30% hydrogen peroxide solution, the concentration of carbon nanotubes is 2.5mg / mL, ultrasonically dispersed at room temperature for 1h, and then reacted at 80℃ for 2h Perform suction filtration treatment to obtain pretreated carbon nanotubes;
[0029] 2. Add the pretreated carbon nanotubes to 80 mL of a mixed acid solution of 18 mol / L sulfuric acid and 16 mol / L nitric acid. The volume ratio of sulfuric acid to nitric acid is 3:1, and ultrasonic dispersion is performed at 60°C for 4 hours. The acid solution is diluted to 100 times the original concentration and filtered, then washed with water and ethanol until the pH is between 6 and 7, and dried in a vacuum drying oven at 120°C for 24 hours to obtain carboxylated carbon nanotubes;
[0030] 3. Weigh 0.2g of carboxylated carbon nanotubes, 3.0g of vanadium trioxide and 15.12g of lithium hydroxide monohydrate, uniformly disperse them in 50mL of deionized water, hydrotherm...
Embodiment 2
[0033] 1. Weigh 1g of carbon nanotubes and add it to 200mL of 20% hydrogen peroxide solution, the concentration of carbon nanotubes is 5mg / mL, ultrasonically dispersed at room temperature for 1h, and then reacted at 80℃ for 3h before pumping Filter treatment to obtain pretreated carbon nanotubes;
[0034] 2. Add the pretreated carbon nanotubes to 80 mL of a mixed acid solution of 15 mol / L sulfuric acid and 12 mol / L nitric acid. The volume ratio of sulfuric acid to nitric acid is 3:1. After ultrasonic dispersion at 70°C for 3 hours, the acid Dilute the solution to 200 times the original concentration, perform suction filtration, then wash with water and ethanol until the pH is between 6 and 7, and dry in a vacuum drying oven at 100°C for 24 hours to obtain carboxylated carbon nanotubes;
[0035] 3. Weigh 0.2g of carboxylated carbon nanotubes, 3.0g of vanadium trioxide, 8.82g of lithium hydroxide monohydrate, and 12.42g of lithium nitrate, uniformly disperse them into 50mL of deioniz...
Embodiment 3
[0038] 1. Weigh 0.5g of carbon nanotubes and add it to 400mL of 20% hydrogen peroxide solution, the concentration of carbon nanotubes is 1.25mg / mL, ultrasonically dispersed at room temperature for 2h, and then reacted at 90℃ for 2h Perform suction filtration treatment to obtain pretreated carbon nanotubes;
[0039] 2. Add the pretreated carbon nanotubes to 80mL of a mixed acid solution of 12mol / L sulfuric acid and 16mol / L nitric acid. The volume ratio of sulfuric acid to nitric acid is 3:1. After ultrasonic dispersion at 80°C for 4 hours, the acid Dilute the solution to 100 times the original concentration, perform suction filtration, and then wash with water and ethanol until the pH is between 6 and 7, and dry in a vacuum drying oven at 120°C for 22 hours to obtain carboxylated carbon nanotubes;
[0040] 3. Weigh 0.2g of carboxylated carbon nanotubes, 3.64g of vanadium pentoxide and 24.83g of lithium nitrate, uniformly disperse them in 50mL of deionized water, hydrothermally heat ...
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