A kind of carbon-based composite material, preparation method and sodium-ion battery
A carbon-based composite material, porous carbon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex and harsh heat treatment conditions, can not be really applied, poor rate performance, etc., to improve the first Coulomb efficiency , avoid irreversible reactions, improve the effect of rate performance
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Embodiment 1
[0046] S1. Surface oxidation treatment of porous carbon materials: Weigh 1g of commercial activated carbon (marked as AC) powder into a three-necked flask, add 68% concentrated nitric acid until the powder is just submerged, and stir in a constant temperature oil bath at 70°C Reflux reaction for 4 hours, after the reaction is completed, filter and wash with deionized water and ethanol until the pH value of the filtrate is close to 7, and finally dry the washed powder in a vacuum oven for 24 hours to obtain surface oxidized activated carbon (marked as OAC);
[0047] S2, metal oxide surface coating treatment: 88.38mg of SnCl 4 ·5H 2 O was dissolved in a mixed solution of 70mL ethanol and 10mL deionized water, and then under magnetic stirring conditions, 5mmol of urea and 270mg of OAC were added, ultrasonically dispersed for 1h, and then transferred to a hydrothermal reactor, and the reactor was placed in an explosion-proof In the oven, set 180°C, hydrothermal reaction for 12h, ...
Embodiment 2
[0050] The difference from Example 1 is that the porous carbon material selected in S1 is replaced with a specific surface area of 1330m 2 / g of activated carbon fiber, in S2, heat in water at 160°C for 18h in an explosion-proof oven. 500 DEG C of insulation 12h under argon atmosphere; All the other are the same as embodiment 1, do not go into details here, obtain specific surface area and be 152m 2 / g of carbon-based composite materials, at a current density of 100mA / g, the first coulombic efficiency is 53.6%, the capacity is 221mAh / g, and at a current density of 5A / g, the discharge specific capacity is 54mAh / g.
Embodiment 3
[0052] The difference from Example 1 is that the porous carbon material selected in S1 is replaced with a specific surface area of 3200m 2 / g of commercial carbon cloth, surface oxidation treatment in a constant temperature oil bath at 90°C for reflux oxidation for 6h; in S2, in an explosion-proof oven at 220°C for 6h, the rest are the same as in Example 1, and will not be repeated here; the specific surface area is obtained 231m 2 / g of carbon-based composite materials, at a current density of 100mA / g, the first coulombic efficiency is 46.2%, the discharge specific capacity is 312mAh / g, and at a current density of 5A / g, the discharge specific capacity is 68mAh / g.
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