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Petroleum coke based activated carbon for electrode material of supercapacitor, preparation method therefor and use thereof

A technology for activated carbon and petroleum coke, applied in the field of activated carbon preparation, can solve the problems of insufficient contact, large consumption of raw materials, and high production cost, and achieve the effects of suppressing gas swelling, prolonging cycle life, and enhancing the degree of contact.

Inactive Publication Date: 2016-01-13
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, other oxygen-containing functional groups re-introduced in the purification and pickling process of this prior art are not effectively removed, and the performance improvement of activated carbon materials is limited.
In addition, the invention uses the loss of ignition rate as the evaluation of the pre-oxidation effect, which cannot truly reflect the degree of oxidation of coke raw materials under pre-oxidation conditions, and cannot provide controllable process parameters for the industrial preparation of pre-oxidation precursors
At the same time, this invention does not effectively control its reasonable pore size distribution range for the preparation of activated carbon with high specific surface area, and it is easy to cause most of the higher specific surface area to be provided by micropores with a pore size less than 2nm. limited improvement
[0005] Simultaneously, the above-mentioned patent method also generally has the following deficiencies in the preparation process: (1) the alkali carbon used is relatively high, the activation yield is low, the raw material consumption is large, and the activation time is too long, which easily leads to higher production costs and serious pollution ; (2) The proportion of micropores in activated carbon obtained by using KOH as the activator is too large, the capacity is low and the pore size distribution is unreasonable; Insufficient internal activation and different contact degrees of activators lead to uneven activation; (4) The requirements for the sulfur content of raw petroleum coke are strict, which increases the preparation cost of petroleum coke activated carbon, etc.
In addition, when activated carbon for supercapacitors with large specific surface area is prepared by alkali activation, a high alkali-carbon ratio and a high activation temperature are often required, and a large amount of alkali activators used greatly increases the manufacturing cost of activated carbon; the sulfur content in petroleum coke Higher consumption of activator will reduce the activation efficiency, and various by-products will be generated during the activation process to affect the cycle performance of activated carbon; at the same time, when high-carbon raw materials are mixed with alkali activators, the hydrophobicity of high-carbon raw materials often causes them to mix with water-soluble Insufficient contact with aggressive alkaline activators, resulting in insufficient activation and low specific surface area

Method used

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  • Petroleum coke based activated carbon for electrode material of supercapacitor, preparation method therefor and use thereof
  • Petroleum coke based activated carbon for electrode material of supercapacitor, preparation method therefor and use thereof
  • Petroleum coke based activated carbon for electrode material of supercapacitor, preparation method therefor and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Put 50 g of carbonized petroleum coke powder that has been pulverized by airflow to a particle size distribution D50 of about 8 to 10 μm into a rotary oxidation furnace (Xianyang Languang Thermal Technology), and feed 200 L / h of compressed air for 30 to 60 minutes, and then at 20°C / min The heating rate is raised to 350 ° C, and after 1 hour of heat preservation, it is rapidly cooled to room temperature in an oxidizing atmosphere to obtain a pre-oxidized precursor; the petroleum coke pre-oxidized precursor is mixed according to the mass ratio of NaOH: pre-oxidized precursor = 3: 1 Put it evenly into the crucible, heat up to 800°C at a rate of 20°C / min under the protection of 50L / h flow rate of nitrogen in a box furnace (Hefei Rixin High Temperature), heat preservation and activation for 1 hour, and then quickly cool to The activated material precursor was obtained at room temperature, the activated material was turned into a slurry, and the pH was adjusted to weak acidity...

Embodiment 2

[0085] Except changing the pre-oxidation temperature to 250° C., the same petroleum coke raw material as in Example 1 was pre-oxidized under the same pre-oxidation conditions as in Example 1 to obtain a pre-oxidation precursor. Mix the pre-oxidized precursor according to the mass ratio of NaOH: pre-oxidized precursor = 3:1 and put it into the crucible, and heat it up at a rate of 20 °C / min in a box furnace under the protection of nitrogen with a flow rate of 50 L / h After activation at 800°C for 1 hour, it was quickly cooled to room temperature under the protection of an inert atmosphere to obtain the precursor of the activated material. After the same purification and heat treatment as in Example 1, a petroleum coke activated carbon sample was obtained. Its specific surface area is 2187m 2 / g, mesopores with a pore diameter of 2-50nm account for 28% of all pores, the specific capacity of the organic system is 158F / g, and the specific capacity of the inorganic system is 270F / g....

Embodiment 3

[0087] In addition to controlling NaOH:preoxidation precursor=2:1 (mass ratio) during the activation process, the rest adopt the same conditions as in Example 1 to obtain petroleum coke-based activated carbon. Its specific surface area is 1823m 2 / g, mesopores with a diameter of 2-50nm account for 16% of the total pores, the specific capacity of the organic system is 152F / g, and the specific capacity of the inorganic system is 271F / g. Et at 1M 4 NBF 4 After 10,000 charge-discharge cycles in the / PC organic electrolyte, the capacity retention rate is 87%.

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Abstract

The invention provides petroleum coke based activated carbon, a preparation method therefor and use thereof. The petroleum coke based activated carbon has the following characteristics that the specific surface area calculated by the BET method is 1,700-2,500m<2> / g, the ratio of mesopores with the pore size of 2-50nm accounts for 20-40% of whole pores, the average particle diameter is 5-20 microns, the total content of surface oxygen-containing functional groups tested by the Boehm titration method is lower than 0.1mmol / g, the content of contained total heavy-metal impurities is lower than 100ppm, and the content of anions is lower than 50ppm. The petroleum coke based activated carbon has a high specific surface area, reasonable pore size distribution, low impurity content and high specific capacity and can be applied to supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and relates to an activated carbon for supercapacitors, a preparation method and its application, in particular to a method for preparing activated carbon from petroleum coke and its application in supercapacitors. Background technique [0002] Supercapacitor is a new type of green energy storage element between ordinary capacitors and batteries. It has the advantages of high power density, fast charging speed, long cycle life, and no pollution to the environment. It is widely used as a backup for various electronic products. power supply and auxiliary power supply for hybrid vehicles. [0003] The core of the development of supercapacitor technology is the electrode material. Activated carbon materials are widely used in the field of supercapacitors due to their low price, high specific surface area, controllable pore size, superior electrochemical performance, and environmental fri...

Claims

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Application Information

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IPC IPC(8): C01B31/12H01G11/34
CPCY02E60/13
Inventor 王坤陈龙李一帆汪福明岳敏任建国黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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