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Method for preparing nitrogen-doped porous carbon nanofiber cloth

A nanofiber, porous carbon technology, applied in microfiber electrodes, hybrid/electric double layer capacitor manufacturing, active material electrodes, etc. problems, to achieve the effect of less demanding operation and environmental requirements, low cost and excellent electrochemical performance

Active Publication Date: 2014-06-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported fibrous carbon materials or porous carbon materials are difficult to meet the actual needs due to poor electrochemical performance, high cost, complicated preparation process, and inability to obtain high-performance anode materials in a stable and controllable manner.

Method used

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  • Method for preparing nitrogen-doped porous carbon nanofiber cloth
  • Method for preparing nitrogen-doped porous carbon nanofiber cloth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Use melamine as the nitrogen-rich compound and PAN as the polymer to prepare the precursor solution. First prepare a 10% PAN solution, add Melamine (Mel) with Mel:PAN=1:2 (mass ratio), and mechanically stir in a constant temperature water bath at 70°C for 10 hours.

[0032] (2) Dilute the precursor solution in 1.0 mL h -1 The constant rate is pumped to the electrospinning device with a micro-quantitative pump. The electrospinning uses a flat stainless steel needle as a nozzle with an inner diameter of about 1mm. The collecting plate is graphite paper. The distance between the needle and the graphite plate is 20cm, and the voltage is 25kV.

[0033] (3) Pre-oxidation: the obtained electrospun fiber cloth, 5°C min -1 Rise from room temperature to 250°C for 1h, then at 2°C for min -1 , rise to 260°C and 270°C, and keep warm for 1h and 2h respectively to achieve the purpose of pre-oxidation.

[0034] Carbonization and activation: under the protection of nitrogen, the ...

Embodiment 2

[0038]The nitrogen-doped porous carbon nanofiber cloth was prepared using the same method as in Example 1, except that it was activated with ammonia gas.

[0039] refer to figure 1 , the nitrogen-doped porous carbon nanofiber cloth prepared in this example is used as the negative electrode material of lithium-ion battery at 25°C, 50mA g -1 Charge-discharge capacity, Coulombic efficiency, and cycle stability graphs at current densities.

[0040] The nitrogen-doped porous carbon nanofiber cloth lithium ion negative electrode material obtained by this method has high specific capacity, good rate performance and cycle stability performance. at 50mAg -1 Under the current density, the first charge and discharge specific capacity is 1323mAh g -1 and 2245mAh g -w , the first Coulombic efficiency is 59%. After 50 cycles, the charging capacity is 1150mAh g -1 .

[0041] figure 2 Scanning electron micrograph of the nitrogen-doped porous carbon nanofiber cloth prepared for this e...

Embodiment 3

[0043] A nitrogen-doped porous carbon nanofiber cloth was prepared using the same method as in Example 1, except that urea was used as the nitrogen-enriched compound.

[0044] The nitrogen-doped porous carbon nanofiber cloth lithium ion negative electrode material that this method obtains is in 50mA g -1 Under the current density, the first charge and discharge specific capacity is 750mAh g -1 and 1445mAh g -1 , the first Coulombic efficiency is 52%. After 50 cycles, the charging capacity is 550mAh g -1 .

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Abstract

The invention relates to a method for preparing nitrogen-doped porous carbon nanofiber cloth. The nitrogen-doped porous carbon nanofiber cloth is prepared by adding a nitrogen-rich compound into an organic solution, electrospinning and subsequent carbonizing-activating, has a self-support structure, omits preparation steps of size mixing, coating and the like, needs no conductive agent or binder, and can be directly used as the negative electrode of a lithium ion battery. The electrochemical performance of the negative electrode material of the lithium ion battery is improved by doping nitrogen and activating and forming pores; compared with a commercial graphite lithium ion battery negative electrode material, the nitrogen doping porous carbon nanofiber cloth used as the negative electrode material of the lithium ion battery has simple steps for preparing the electrode, has higher specific capacity, good power performance and circulatory stability. The method also can be used as the electrode material of super capacitors and other novel batteries.

Description

technical field [0001] The invention relates to the technical field of carbon materials and chemical power sources, in particular to a preparation method of a nitrogen-doped porous carbon nanofiber cloth used as a negative electrode material of a lithium ion battery. Background technique [0002] Energy shortage and environmental pollution are two major problems that human society must face in today's world. To solve these two problems, scholars generally believe that there are two ways: one is to find and develop new clean energy to replace existing fossil energy; the other is to improve the performance of existing secondary batteries. [0003] Compared with other traditional secondary battery technologies, lithium-ion batteries have high working voltage, small size, light weight, high specific energy, no memory effect, small self-discharge, long cycle life, low environmental pollution, safe and fast charging, and work Wide temperature range and other advantages are widely...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/583H01G11/86
CPCY02E60/122H01M4/1393H01M4/583H01M10/0525H01M2004/021H01M2004/022Y02E60/10
Inventor 康飞宇楠顶黄正宏沈万慈
Owner TSINGHUA UNIV
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