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A kind of impregnation-activation method to prepare nitrogen-oxygen double-doped promoss-based hierarchical porous carbon material and use thereof

A carbon material and double-doping technology, which is applied in the preparation/purification of carbon, etc., can solve the problems of inability to achieve fast and effective insertion and deintercalation of lithium ions, limit the electrochemical performance of lithium-ion batteries, and low theoretical capacity of ink, etc., to achieve Excellent rate performance, simple and easy preparation method, and the effect of improving capacity performance

Active Publication Date: 2019-03-22
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used anode material is graphite anode material, but its ink theoretical capacity (372 mAh g -1 ) low, poor rate performance and other factors limit the improvement of the electrochemical performance of lithium-ion batteries
It is worth mentioning that the interlayer spacing of graphite electrodes is small, and it will not be possible to achieve rapid and effective insertion and extraction of lithium ions.

Method used

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  • A kind of impregnation-activation method to prepare nitrogen-oxygen double-doped promoss-based hierarchical porous carbon material and use thereof
  • A kind of impregnation-activation method to prepare nitrogen-oxygen double-doped promoss-based hierarchical porous carbon material and use thereof
  • A kind of impregnation-activation method to prepare nitrogen-oxygen double-doped promoss-based hierarchical porous carbon material and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] We obtained Enteromorpha from seawater, washed it with distilled water and dried it. The dried Enteromorpha was mixed with 3M KOH solution, soaked for 12 hours, and then dried to obtain the Enteromorpha-KOH precursor complex, and the mass ratio of Enteromorpha and KOH was controlled to be 1:1. Afterwards, the dried complex was placed in a tube furnace, followed by heating at 40 mL min -1 N 2 Atmosphere with 3 o C min -1 speed up to 800 o C, and keep it at this temperature for 1h, and after cooling, a carbonized sample can be obtained. The obtained product was washed with 2M hydrochloric acid for more than 12 hours to remove impurities, then washed with deionized water and suction filtered, and then the sample was placed in 60 o C. Dry in a vacuum drying oven for more than 8 hours to obtain a nitrogen-oxygen double-doped Enteromorpha-based carbon electrode material. Mix the obtained nitrogen-oxygen double-doped Enteromorpha-based carbon electrode material with cond...

Embodiment 2

[0023] The method of this embodiment is basically the same as that of Example 1, except that the dried Enteromorpha is mixed with 2M KOH solution, soaked for 24 hours, and then dried to obtain the Enteromorpha-KOH precursor compound, and the control of Enteromorpha and The mass ratio of KOH is 1:0.5. The change of the specific capacity of this electrode material for supercapacitors and lithium-ion battery negative electrodes at different current densities is also reflected in Figure 3 and Figure 3. Figure 4 middle. Table 1 lists the specific test results of the electrode material.

Embodiment 3

[0025] The method of the present embodiment is basically the same as that of Example 1, except that the dried Enteromorpha is mixed with 1M KOH solution, soaked for 48h, and then dried to obtain the Enteromorpha-KOH precursor complex, and the control of Enteromorpha and The mass ratio of KOH is 1:0.25. This electrode material is used in supercapacitors and lithium-ion battery negative electrodes, and the change in specific capacity at different current densities is also reflected in image 3 with Figure 4 middle. Table 1 lists the specific test results of the electrode material.

[0026] It can be clearly seen from Table 1 that the specific surface area and pore volume of the nitrogen-oxygen double-doped Enteromorpha-based carbon material of the present invention are relatively high, and the ratio of micropores and mesopores in the pore structure has been effectively regulated. In addition, the oxygen element content in the sample is above 11 at%, and the nitrogen element ...

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Abstract

The invention discloses a method for preparing a nitrogen oxygen double doped enteromorpha-based layered pore carbon material by a dipping-activating method, and application of the material, and belongs to the field of novel energy materials. The nitrogen oxygen double doped enteromorpha-based layered pore carbon material is prepared by an activating method and is prepared by the following steps: taking KOH, NaOH, H3PO4, K2CO3 and ZnCl2 solutions with a certain concentration as an activating agent, mixing the activating agent and dried enteromorpha, soaking for a certain time, and drying to obtain an enteromorpha-activating agent precursor; obtaining the nitrogen oxygen double doped porous carbon material further through process steps of high-temperature carbonization-activation, acid washing and the like. An electrode material obtained by the method has the characteristics of three-dimensional opening structure, large specific surface area, layered pore structure, doping of rich hetero elements and the like, can regulate and control the shape, the structure and the like by controlling the process conditions, and can be applied to the electrode materials of supercapacitors and lithium ion batteries. The method provided by the invention adopts the enteromorpha as the raw material, has the advantages of rich source, low cost and simple preparation process, realizes high-additional-value utilization of the enteromorpha and effectively reduces the cost of the electrode material.

Description

technical field [0001] The invention belongs to the field of new energy materials, and provides a method for preparing a nitrogen-oxygen double-doped enteromorpha-based hierarchical porous carbon material by an impregnation-activation method and its application in supercapacitors, lithium-ion battery electrode materials, and the like. Background technique [0002] The preparation of high-performance and low-cost carbon materials has always been the bottleneck restricting the progress of energy storage. Nowadays, considering commercial cost and sustainable development issues, the preparation of carbon materials from biomass precursors has become an important development direction. For example, coconut shells, wood, rice husks, walnut shells, banana peels, cellulose, etc. are used to prepare porous carbon materials and use them as electrode materials for supercapacitors and lithium-ion batteries. [0003] Supercapacitors, also known as electric double-layer capacitors or elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
Inventor 王焕磊于文华毛楠
Owner OCEAN UNIV OF CHINA