A preparation method of carbon nanosheet negative electrode material and its application in sodium ion battery
A nanosheet and porous carbon technology is applied to porous carbon nanosheet materials and their preparation, the application of porous carbon nanosheet materials in sodium ion batteries, and the field of carbon materials to achieve rich sodium storage active sites and good process repeatability , the effect of good sodium ion storage capacity
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Embodiment 1
[0032] Add 1 g of dopamine to a lithium chloride solution with a concentration of 10 g / L, adjust the pH of the solution to 8.5, and keep the temperature at 20° C. for 48 hours to obtain a polydopamine-lithium chloride gel; The precursor was obtained after carbonization and water washing in a quartz tube furnace, the carbonization temperature was 700°C, and the carbonization time was 5h. The obtained precursor was placed in an argon plasma furnace with a power of 90W and a pressure of 40Pa, and was etched for 200s to obtain a porous carbon nanosheet material. The thickness of carbon nanosheets is concentrated at about 70nm, and the specific surface area of the obtained porous carbon nanosheets is 1870m 2 / g.
[0033] The carbon nanosheet material prepared in this example is used as the working electrode, sodium is used as the counter electrode, and the button battery is assembled into a button battery. At a current density of 50mA / g, the cycle performance is tested; The rat...
Embodiment 2
[0035] Add 1 g of dopamine to a lithium chloride solution with a concentration of 100 g / L, adjust the pH of the solution to 8.5, and keep the temperature at 30° C. for 40 hours to obtain a polydopamine-lithium chloride gel; The precursor was obtained after carbonization and water washing in a quartz tube furnace, the carbonization temperature was 600°C, and the carbonization time was 2h. The obtained precursor was placed in an argon plasma furnace with a power of 90W and a pressure of 40Pa, and was etched for 400s to obtain a porous carbon nanosheet material. The thickness of the carbon nanosheets is concentrated at about 20nm, and the specific surface area of the obtained porous small-sized carbon nanosheets is 2070m 2 / g.
[0036]The carbon nanosheet material prepared in this example is used as the working electrode, sodium is used as the counter electrode, and the button battery is assembled into a button battery. At a current density of 50mA / g, the cycle performance is ...
Embodiment 3
[0038] Add 1 g of dopamine to a lithium chloride solution with a concentration of 1 g / L, adjust the pH of the solution to 8.5, and keep the temperature at 80°C for 20 hours to obtain a polydopamine-lithium chloride gel; The precursor was obtained after carbonization and water washing in a quartz tube furnace, the carbonization temperature was 500°C, and the carbonization time was 4h. The obtained precursor was placed in an argon plasma furnace with a power of 90W and a pressure of 40Pa, and was etched for 50s to obtain a porous carbon nanosheet material. The thickness of carbon nanosheets is concentrated at about 70nm, and the specific surface area of the obtained porous carbon nanosheets is 670m 2 / g.
[0039] The carbon nanosheet material prepared in this example is used as the working electrode, sodium is used as the counter electrode, and the button battery is assembled into a button battery. At a current density of 50mA / g, the cycle performance is tested; The rate per...
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Abstract
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