Preparation method of porous carbon material and application of porous carbon material as electrode material

A porous carbon and microporous technology, which can be used in the preparation/purification of carbon, battery electrodes, circuits, etc., can solve problems such as limited application, and achieve the effect of good practical application value.

Inactive Publication Date: 2014-08-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to its good cycle performance and abundant reserves, graphite is widely used as a negative electrode material for commercial lithium-ion batte

Method used

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  • Preparation method of porous carbon material and application of porous carbon material as electrode material
  • Preparation method of porous carbon material and application of porous carbon material as electrode material
  • Preparation method of porous carbon material and application of porous carbon material as electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 1g of phenolic resin, 3g of magnesium-aluminum hydrotalcite, and 0.35g of curing agent hexamethylenetetramine in absolute ethanol, mix well after dissolution, and stir naturally until the ethanol is completely volatilized. The mixture was cured in a vacuum oven at 150°C for 4 hours, and then the cured product was placed in a carbonization furnace and heated to 600°C for 6 hours under nitrogen protection. The carbonized product is sequentially treated with excess hydrochloric acid and KOH solution, then centrifuged, washed with deionized water until neutral, and dried to obtain the target porous carbon material.

[0029] Such as figure 1 As shown, the porous carbon material is a loose block with a slit-like pore structure. Its nitrogen isotherm adsorption curve presents an obvious hysteresis loop, indicating that a large number of mesopores are formed ( figure 2 ). The total specific surface area of ​​the porous carbon material is 887 m 2 / g, of which the ...

Embodiment 2

[0033] The operating conditions are the same as in Example 1, except that the mass of the hydrotalcite is changed to 1 g, and the carbonization condition is 800° C. for 6 hours.

[0034] The obtained porous carbon material has a specific surface area of ​​503 m 2 / g. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity reached 652 mAh / g at a current density of 50 mA / g, and the capacity remained at 503 mAh / g after 50 cycles. Under high current, the reversible capacity is 214 mAh / g when the current density is 1 A / g.

Embodiment 3

[0036] The operating conditions are the same as in Example 1, except that the phenolic resin is changed to sucrose, and the carbonization temperature used is 600° C. for 2 hours.

[0037] The obtained porous carbon has a specific surface area of ​​780 m 2 / g. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity reached 884 mAh / g at a current density of 50 mA / g, and the capacity remained at 690 mAh / g after 50 cycles. Under high current, the reversible capacity is 513 mAh / g when the current density is 200 mA / g, and the reversible capacity is 285 mAh / g when the current density is 1A / g.

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Abstract

The invention relates to a porous carbon material used in a cathode of a lithium ion battery, and a preparation method of the porous carbon material. The slit-type porous carbon material which mainly comprises micropores and mesopores is prepared by mixing layered plate-shaped magnesium-aluminum hydrotalcite used as a template with a carbon source, curing, carbonizing and performing acidification treatment. The preparation process is simple, the cost is low, and the specific surface area is adjustable. The slit-type porous carbon provided by the invention has good electrochemical properties when being used as a lithium ion electrode material.

Description

technical field [0001] The invention relates to a porous carbon material, a preparation method and an application in lithium ion batteries, belonging to the fields of electrochemistry and new energy materials. Background technique [0002] Compared with traditional lead-acid batteries and nickel-cadmium batteries, lithium-ion batteries have high output voltage, high energy density, good safety performance, long cycle life, fast charge and discharge, wide operating temperature range, no pollution and no memory effect, etc. Advantages [Lithium-ion battery - application and practice / edited by Wu Yuping. - Beijing: Chemical Industry Press, 2004.3]. Lithium-ion batteries have been widely used in small mobile devices such as mobile phones and notebook computers. In recent years, they are actively developing in the field of large mobile devices, such as electric vehicles, hybrid vehicles and static backup power supplies (UPS). This puts forward higher requirements on the energy ...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01M4/587C01B32/05
CPCY02E60/10
Inventor 宋怀河宋冉冉崔杨岚森陈晓红石利泺
Owner BEIJING UNIV OF CHEM TECH
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