Preparation method of nitrogen-doped porous carbon and application of nitrogen-doped porous carbon in lithium-ion batteries

A nitrogen-doped porous carbon, lithium-ion battery technology, applied in the preparation/purification of carbon, battery electrodes, secondary batteries, etc. Problems such as limited atomic content, to achieve excellent cycle stability, easy large-scale industrial production, and narrow particle size distribution.

Inactive Publication Date: 2018-01-09
江苏福瑞士电池科技有限公司
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Problems solved by technology

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
Therefore, so far, the preparation method of nitrogen-dop

Method used

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  • Preparation method of nitrogen-doped porous carbon and application of nitrogen-doped porous carbon in lithium-ion batteries
  • Preparation method of nitrogen-doped porous carbon and application of nitrogen-doped porous carbon in lithium-ion batteries
  • Preparation method of nitrogen-doped porous carbon and application of nitrogen-doped porous carbon in lithium-ion batteries

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preparation example Construction

[0026] A method for preparing nitrogen-doped porous carbon, specifically comprising the following steps:

[0027] 1) Dissolving the nitrogen source in a solvent to prepare a transparent solution, and adding an appropriate amount of carbon source to the above solution to form a fluffy snowflake-like substance, and drying the above-mentioned snowflake-like substance in a freeze dryer for 1-10 hours;

[0028] 2) The mixed substance obtained after drying in step 1) is heated to 300-1200°C for 1-8h at a rate of 1-8°C / min under an argon atmosphere in a vacuum tube furnace, and then separated and purified to obtain the target product.

[0029] As an improvement, the nitrogen source is a water-soluble ammonium salt selected from melamine (C 3 h 6 N 6 ), ammonium chloride (NH 4 Cl), urea (CO(NH 2 ) 2 ), ammonium bisulfate (NH 4 HSO 4 ) or ammonium nitrate (NH 4 NO 3 ) in any one.

[0030] As an improvement, the solvent of the nitrogen source is selected from deionized water ...

Embodiment 1

[0038] A method for preparing nitrogen-doped porous carbon, specifically comprising the following steps:

[0039] 1) Take 0.3g NH 4 Cl was put into a beaker and 1ml of deionized water was added, and a transparent solution was prepared by ultrasonic oscillation. Gradually, 1.2g of highly water-soluble sodium polyacrylate was added to the above transparent solution, and ultrasonic stirring was performed while adding; finally, deionized water was slowly added to form a relatively clear solution. Fluffy white snowflake-like substance, the above-mentioned substance was transferred to a freeze dryer and dried for 10 hours to obtain a white dry powder;

[0040] 2) After the drying is completed, take an appropriate amount of powder and put it in a crucible, and heat it up to 850°C at a rate of 3°C / min under an argon atmosphere in a vacuum tube furnace for 5 hours. The resulting black product is washed repeatedly with deionized water, and washed with Buchner funnel suction filtration,...

Embodiment 2

[0050] A method for preparing nitrogen-doped porous carbon, specifically comprising the following steps:

[0051] 1) Take 0.3g NH 4 Put Cl into a beaker and add 1ml of deionized water for ultrasonic oscillation to prepare a transparent solution. Gradually add 1.2g of highly water-soluble potassium polyacrylate to the above transparent solution, and stir ultrasonically while adding; finally add deionized water slowly until a fluffy solution is formed. The white snowflake-like substance, the above-mentioned substance is transferred to a freeze dryer and dried for 10 hours to obtain a white dry powder;

[0052] 2) After the drying is completed, put an appropriate amount of powder in a crucible and heat it up to 650°C 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 Buchner funnel suction filtration, drying to obtain a black powder product.

[0053] The obtained...

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Abstract

The invention discloses a preparation method of nitrogen-doped porous carbon and application of the nitrogen-doped porous carbon in lithium-ion batteries. The method comprises the following steps: (1)dissolving a nitrogen source into a solvent to prepare a transparent solution, adding right amount of a carbon source into the transparent solution to form a fluffy snow-shaped material, putting thesnow-shaped material into a freeze dryer, and drying for 1-10h; (2) heating the mixture, obtained after drying in the step (1), up to 300-1200 DEG C at the speed of 1-8DEG C/min under the argon atmosphere in a vacuum tubular furnace, carrying out heat preservation for 1-8h, separating and purifying to obtain the target product. The preparation method is easy in obtaining of the used raw materials,simple in synthesis method and high in controllability of operation steps; furthermore, the obtained product is high in purity, uniform in particle size and easier for production expansion. The prepared nitrogen-doped porous carbon material shows excellent electrochemical performance when being used as an anode material for the lithium-ion batteries.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped improved carbon material, which is used as an anode material of a lithium-ion battery, in particular to a preparation method of a nitrogen-doped porous carbon and its application in a lithium-ion battery. Background technique [0002] Due to the advantages of high working voltage, high energy density, and no memory effect, lithium-ion batteries are widely used in the fields of small mobile electronic products such as cameras, mobile phones, and notebook computers. Eye-catching development prospects. However, with the intensification of the energy crisis and the rapid growth of portable electronic devices and electric vehicles, the current commercial lithium-ion battery graphite anode materials can no longer meet people's needs, and it is urgent to find a new method to improve the performance of carbon materials. [0003] Recently, nitrogen doping of carbon materials has attracted extens...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/36H01M4/62H01M10/0525
CPCY02E60/10
Inventor 鞠治成戚秀君周梅华张宁石红霞
Owner 江苏福瑞士电池科技有限公司
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