Method for preparing nitrogen-doped porous carbon material used as sodium ion battery cathode

A technology for nitrogen-doped porous carbon and sodium-ion batteries, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve the constraints on the application of negative electrode materials for sodium-ion batteries, the difficulty of uniform and controllable doping, and the limited content of nitrogen atoms, etc. problems, to achieve excellent cycle stability, high controllability of operation steps, and narrow particle size distribution

Active Publication Date: 2017-11-07
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, most of these methods are relatively complicated, and the content of doped nitrogen atoms is limited, so it is difficult to achieve uniform and controllable doping
However, so far, the preparation method of nitrogen-doped carbon materials with good chemical composition uniformity, high purity and regular microstructure has not been reported, which greatly restricts the further application of anode materials for sodium-ion batteries.

Method used

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  • Method for preparing nitrogen-doped porous carbon material used as sodium ion battery cathode
  • Method for preparing nitrogen-doped porous carbon material used as sodium ion battery cathode
  • Method for preparing nitrogen-doped porous carbon material used as sodium ion battery cathode

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preparation example Construction

[0023] A method for preparing a nitrogen-doped porous carbon negative electrode material, the steps are as follows:

[0024] (1) The nitrogen source is ammonium salt, selected from ammonium sulfate (NH 4 ) 2 SO 4 , Ammonium Fluoride NH 4 F, ammonium phosphate (NH 4 ) 3 PO 4 , ammonium chloride NH 4 Cl, urea CO(NH 2 ) 2 One of them; the carbon source is a modified highly water-soluble polymer (C 3 h 3 NaO 2 ) n, (C 3 h 3 NaO 2 )n: sodium polyacrylate, wherein n is 200~1000; the solvent of nitrogen source is selected from deionized water or ethanol;

[0025] Dissolve one of the above nitrogen sources in a solvent, the mass ratio of nitrogen source and solvent is 1:2~5, and prepare a transparent solution A; add an appropriate amount of carbon source to the above solution A, the mass of solution A and carbon source The ratio is 1:0.7~2 to form a snowflake-like substance; the above-mentioned snowflake-like substance is dried in a freeze dryer for 2-12 hours to obtain...

Embodiment 1

[0033] Example 1: Preparation and structural characterization of nitrogen-doped porous carbon materials

[0034] Take 0.3g NH 4 Cl is put into beaker and adds 1ml deionized water ultrasonic vibration and is prepared into transparent solution, 1.2g highly water-soluble polymer ((C 3 h 3 NaO 2)n) adding to the above transparent solution, stirring ultrasonically while adding; finally adding deionized water slowly until a fluffy white snowflake-like substance is formed. The above-mentioned substance was transferred to a freeze dryer for 10 hours to obtain a white dry powder. After the drying is completed, put an appropriate amount of powder in a crucible and heat it up to 850 degrees Celsius at a rate of 3°C / min in an argon atmosphere in a vacuum tube furnace for 5 hours. filter through a funnel and dry to obtain a black powder product. The product was analyzed by Cu Kα ray (wavelength The scanning step is 0.08° / sec) identified as disordered carbon material ( figure 1 ), t...

Embodiment 2

[0038] Embodiment 2: get 0.3g NH 4 Cl is put into beaker and adds 1ml deionized water ultrasonic vibration and is prepared into transparent solution, 1.2g highly water-soluble polymer ((C 3 h 3 NaO 2 )n) adding to the above transparent solution, stirring ultrasonically while adding; finally adding deionized water slowly until a fluffy white snowflake-like substance is formed. The above-mentioned substance was transferred to a freeze dryer for 10 hours to obtain a white dry powder. After the drying is completed, put an appropriate amount of powder in a crucible and heat it up to 650 degrees Celsius at a rate of 3°C / min in an argon atmosphere in a vacuum tube furnace for 5 hours. The resulting black product is washed repeatedly with deionized water and washed with a cloth. filter through a funnel and dry to obtain a black powder product.

[0039] The obtained ultrafine powder is an amorphous structure of nitrogen-doped porous carbon material, and the product is composed of n...

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Abstract

The invention provides a method for preparing a nitrogen-doped porous carbon material used as a sodium ion battery cathode, and belongs to a method for preparing nitrogen-doped porous carbon. The nitrogen-doped carbon material is controlled and synthesized by regulating and controlling each parameter in the reacting process by means of a simple and feasible high-temperature solid phase reaction method, and is applied to a sodium ion battery cathode material. The method comprises the following steps: dissolving a selected nitrogen source in a solvent to form a transparent solution A; adding a proper amount of carbon source into the solution A, and constantly adding into solvent to sufficiently disperse the nitrogen source under a stirring state; drying the materials in a lyophilizer for 2-12 hours; putting a proper amount of the materials into a crucible, heating to 300-1100 DEG C and insulating for 1-6 hours in a vacuum tube furnace under an argon atmosphere at a speed of 2-8 DEG C/minute; and separating and purifying the generated product to obtain a product. The preparation method has the advantages of low-price and easily available raw materials, simple synthesis method and high controllability of operation steps, and is easy for expanded production. The nitrogen-doped porous carbon material can be used as a sodium ion battery cathode material, and shows excellent electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped porous carbon material, in particular to a preparation method of a nitrogen-doped porous carbon material used as a negative electrode material of a sodium ion battery. Background technique [0002] Lithium-ion batteries have been widely used as the main energy source for portable electronic devices due to their high energy density. However, lithium reserves are limited and expensive, which greatly limits the long-term large-scale application of lithium-ion batteries. At present, sodium-ion batteries have become the most likely secondary batteries to replace lithium-ion batteries due to the advantages of rich sodium resources, low cost, and environmental friendliness. [0003] Most of the currently reported commercial anode materials for sodium-ion batteries are graphite anodes. However, the intercalation amount of sodium ions in graphite is very small, which can only reach 35mAh / g, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054
CPCH01M4/583H01M10/054Y02E60/10
Inventor 邢政戚秀君赵宇龙黄康生吴璇鞠治成
Owner CHINA UNIV OF MINING & TECH
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