A kind of preparation method and application of nitrogen-doped self-supporting nanofiber membrane

A nanofiber membrane, self-supporting technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of poor electrochemical performance and small storage capacity of SIB anode materials, and achieve improved rate performance and improved electrochemical performance. , the effect of excellent cycle stability

Active Publication Date: 2022-08-05
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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  • A kind of preparation method and application of nitrogen-doped self-supporting nanofiber membrane
  • A kind of preparation method and application of nitrogen-doped self-supporting nanofiber membrane
  • A kind of 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 following steps:

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

[0033] S2. Use a 20 ml syringe to absorb the spinning solution, 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 then cut into square sheets of 5 × 9 cm, and the fiber membrane was laminated with a smooth surface graphite sheet.

[003...

Embodiment 2

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

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

[0038] S2. Use a 20 ml syringe to suck the spinning solution, 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 disc 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 then cut into square pieces of 5 × 9 cm. figure 1The shown fixture was loaded with a load of 100 g for 2 h to thermally stret...

Embodiment 3

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

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

[0043] S2. Use a 20 ml syringe to suck the spinning solution, 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 10 h to remove the solvent, and then cut into square pieces of 5 × 9 cm. figure 1 The jig shown is loaded under a load of 200 g for 2 h to thermally stretch...

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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 includes the following steps: S1. After accurately weighing the solute and the solvent, place it in an oil bath at 40°C to 80°C and stir at constant temperature for 5 to 20 hours to prepare spinning fibers. S2, the spinning solution prepared in S1 is made into a composite nanofiber membrane; the composite nanofiber membrane is placed in a drying oven to remove the solvent, cut into a certain size, and the fiber membrane is pressed with a smooth surface graphite sheet; S3. The fiber membrane obtained in S2 is placed in a quartz tube furnace for 1-2 h under an air atmosphere of 260-280°C; and then carbonized for 1-3 h under a nitrogen atmosphere of 600-800°C; the reaction ends After that, the nitrogen-doped self-supporting nanofiber membrane is obtained by cooling in the furnace to room temperature. The nitrogen-doped self-supporting nanofiber membrane prepared by the invention has high storage capacity and high electrochemical performance, and can be directly used as 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 for lithium-ion batteries (LIBs) in portable electronic devices. However, due to the lack of high-performance electrode materials, the rate capability of Na-ion batteries is insufficient; the ionic radius of Na-ions is larger than that of Li-ions, which will affect Na + The short cycle life of Na-ion batteries due to ion transport and structural stability during cycling seriously hinders the development of SIBs. To meet the demand for high energy density devices, efficient electrode materials with high storage capacity and fast kinetic processes of SIBs are required. [0003] Conventional SIB elec...

Claims

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Application Information

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Patent Type & Authority Patents(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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