Zinc sulfide/multi-walled carbon nanotube composite material for lithium/sodium ion battery negative electrode and preparation method
A technology of multi-walled carbon nanotubes and sodium-ion batteries, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc. and other issues, to achieve the effect of improving cycle stability, improving electrical conductivity, and buffering volume expansion
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Embodiment 1
[0022] 1). Add 0.04g of multi-walled carbon nanotubes to 80ml of deionized water, and ultrasonicate for 0.5h to obtain a mixed solution of uniformly dispersed multi-walled carbon nanotubes. The concentration of multi-walled carbon nanotubes in the mixed solution is 0.5g / L;
[0023] 2). Add 0.658g of zinc acetate to the uniformly dispersed mixed solution of multi-walled carbon nanotubes prepared in step 1), stir at 200r / min for 10min, add 12.16g of thiourea, and continue to stir at 200r / min for 0.5h , To prepare a mixed solution containing multi-walled carbon nanotubes, zinc salt and sulfur;
[0024] 3). The mixed solution containing multi-walled carbon nanotubes, zinc salt and sulfur prepared in step 2) is hydrothermally incubated at 140°C for 4 hours;
[0025] 4). The hydrothermal product is washed repeatedly with deionized water and ethanol for 6 times to remove impurities, and dried in vacuum at 60°C for 10 hours to obtain a zinc sulfide / multi-walled carbon nanotube composite mate...
Embodiment 2
[0028] 1). Add 0.18g of multi-walled carbon nanotubes to 80ml of deionized water and ultrasonicate for 0.75h to obtain a mixed solution of uniformly dispersed multi-walled carbon nanotubes. The concentration of multi-walled carbon nanotubes in the mixed solution is 2.25g / L;
[0029] 2). Add 0.658g of zinc acetate to the uniformly dispersed mixed solution of multi-walled carbon nanotubes prepared in step 1), stir at 300r / min for 20min, add 12.16g of thiourea, and continue to stir at 300r / min for 0.75h , To prepare a mixed solution containing multi-walled carbon nanotubes, zinc salt and sulfur;
[0030] 3). The mixed solution containing multi-walled carbon nanotubes, zinc salt and sulfur prepared in step 2) is hydrothermally incubated at 150°C for 5 hours;
[0031] 4). The hydrothermal product is washed with deionized water and ethanol for 7 times to remove impurities, and dried in vacuum at 70°C for 11 hours to obtain a zinc sulfide / multi-walled carbon nanotube composite material.
[0...
Embodiment 3
[0034] 1). Add 0.32g of multi-walled carbon nanotubes to 80ml of deionized water and ultrasonicate for 1 hour to obtain a uniformly dispersed mixture of multi-walled carbon nanotubes. The concentration of multi-walled carbon nanotubes in the mixture is 4g / L;
[0035] 2). Add 0.658g of zinc acetate to the uniformly dispersed mixture of multi-walled carbon nanotubes prepared in step 1), and after stirring for 30min at 400r / min, add 12.16g of thiourea and continue to stir at 400r / min for 1h, Prepare a mixed solution containing multi-walled carbon nanotubes, zinc salt and sulfur;
[0036] 3). The mixed solution containing multi-walled carbon nanotubes, zinc salt and sulfur prepared in step 2) is hydrothermally incubated at 160°C for 6 hours;
[0037] 4). The hydrothermal product is repeatedly washed with deionized water and ethanol for 8 times to remove impurities, and dried in a vacuum at 80°C for 12 hours to obtain a zinc sulfide / multi-walled carbon nanotube composite material.
[0038]...
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