Preparation method and application of nitrogen-doped self-supporting nanofiber membrane

A technology of nanofiber membrane and composite nanofiber, which is applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of small storage capacity and poor electrochemical performance of SIB negative electrode materials, so as to improve electrochemical performance and increase the rate Effects of performance, shortened insertion and extraction paths

Active Publication Date: 2021-07-13
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems of small storage capacity and poor electrochemical performance of the SIB negative electrode material in the prior art, and to provide a preparation method and application of a nitrogen-doped self-supporting nanofiber membrane

Method used

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  • Preparation method and application of nitrogen-doped self-supporting nanofiber membrane
  • Preparation method and application of nitrogen-doped self-supporting nanofiber membrane
  • Preparation method and application of nitrogen-doped self-supporting nanofiber membrane

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Embodiment 1

[0031] A method for preparing a nitrogen-doped self-supporting nanofiber membrane, comprising the steps of:

[0032] S1. Accurately weigh 8.7 g DMF and 1.3 g PAN, dissolve PAN into DMF and place it in an oil bath at 60 °C for 10 h at constant temperature, and prepare spinning solution after PAN is completely dissolved.

[0033] S2. Select a 20 ml syringe to absorb the spinning solution, and fix it on the injection flow rate controller, turn on the electrospinning equipment to adjust the relevant spinning parameters (spinning temperature 45 ℃, humidity 36%, 22 G needle, voltage 26 Kv, rotation speed 200r / min, flow rate 2 ul / min, the distance between the needle and the receiving plate is 21 cm), and the nanofiber membrane was prepared. The nanofiber membrane was placed in a blast drying oven at 60 °C for 6 h to remove the solvent, cut into square pieces of 5 × 9 cm, and the fiber membrane was laminated with a graphite sheet with a smooth surface.

[0034] S3. Place the fiber fi...

Embodiment 2

[0036] A method for preparing a nitrogen-doped self-supporting nanofiber membrane, comprising the steps of:

[0037] S1. Accurately weigh 8.2 g DMF and 1.8 g PAN, dissolve PAN into DMF and place it in an oil bath at 50 °C for 10 h at constant temperature, and prepare spinning solution after PAN is completely dissolved.

[0038] S2. Select a 20 ml syringe to absorb the spinning solution, and fix it on the injection flow rate controller, turn on the electrospinning equipment to adjust the relevant spinning parameters (spinning temperature 45 ℃, humidity 36%, 22 G needle, voltage 26 Kv, rotation speed 200r / min, flow rate 2 ul / min, the distance between the needle and the receiving plate is 21 cm), and the nanofiber membrane was prepared. The nanofiber membrane was placed in a blast drying oven at 60°C to remove the solvent for 6 h, and cut into square pieces of 5 × 9 cm, using such as figure 1The jig shown is under a load of 100 g for 2 h to thermally stretch the fiber membrane, ...

Embodiment 3

[0041] A method for preparing a nitrogen-doped self-supporting nanofiber membrane, comprising the steps of:

[0042] S1. Accurately weigh 10 g DMF and 1.6 g PAN, dissolve PAN into DMF and place it in an oil bath at 55 °C for 10 h at constant temperature, and prepare spinning solution after PAN is completely dissolved.

[0043] S2. Select a 20 ml syringe to absorb the spinning solution, and fix it on the injection flow rate controller, turn on the electrospinning equipment to adjust the relevant spinning parameters (spinning temperature 45 ℃, humidity 36%, 22 G needle, voltage 26 Kv, rotation speed 200r / min, flow rate 2 ul / min, the distance between the needle and the receiving plate is 21 cm), and the nanofiber membrane was prepared. The nanofibrous membrane was placed in a blast drying oven at 60°C for 10 h to remove the solvent, and cut into square pieces of 5 × 9 cm, using such as figure 1 The jig shown is hot stretching the fiber membrane under a load of 200g for 2h, and t...

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Abstract

The invention discloses a preparation method and application of a nitrogen-doped self-supporting nanofiber membrane. The preparation method of the nitrogen-doped self-supporting nanofiber membrane comprises the following steps: S1, accurately weighing a solute and a solvent, placing the solute and the solvent in an oil bath pan at 40-80 DEG C, and stirring for 5-20 hours at a constant temperature to prepare a spinning solution; S2, preparing the spinning solution prepared in the S1 into a composite nanofiber membrane, placing the composite nanofiber membrane in a drying box to remove a solvent, cutting the composite nanofiber membrane into a certain size, and pressing the fiber membrane by using a graphite sheet with a smooth surface; S3, putting the fiber membrane obtained in S2 into a quartz tube furnace, and carrying out heat preservation for 1-2 hours in an air atmosphere at 260-280 DEG C, then carrying out heat preservation for 1-3 hours in a nitrogen atmosphere of 600-800 DEG C, and carrying out carbonization treatment, and after the reaction is finished, cooling along with the furnace to room temperature to obtain the nitrogen-doped self-supporting nanofiber membrane. The nitrogen-doped self-supporting nanofiber membrane prepared by the method has high storage capacity and high electrochemical performance, and can be directly used as an SIB negative electrode material.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a preparation method and application of a nitrogen-doped self-supporting nanofiber membrane. Background technique [0002] Given the high availability and low cost of sodium, sodium-ion batteries (SIBs) have attracted great interest as an alternative energy storage system to lithium-ion batteries (LIBs) for portable electronic devices. However, due to the lack of high-performance electrode materials, the rate capability of sodium-ion batteries is insufficient; the ionic radius of sodium ions is larger than that of lithium ions, which will affect the Na + The ion transport and structural stability during cycling lead to short cycle life of Na-ion batteries, which seriously hinders the development of SIBs. To meet the demand for high-energy-density devices, efficient electrode materials with high storage capacity and fast kinetics of SIBs are required. [0003] Conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054
CPCH01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 陈建卿龙李瑞唐利平雷智强伍言康
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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