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Nitrogen-doped porous carbon nanofiber sodium ion battery negative electrode material and preparation method thereof

A sodium-ion battery, nanofiber technology, applied in battery electrodes, secondary batteries, chemical characteristics of fibers, etc., can solve the problems of volume expansion, poor electrical conductivity of electrode materials, etc., and achieve easy operation, low cost, and infiltration. Effect

Pending Publication Date: 2022-04-15
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problems of the prior art, the object of the present invention is to overcome the deficiencies in the prior art, and provide a nitrogen-doped-porous carbon nanofiber sodium-ion battery negative electrode material and its preparation method, which is prepared by electrospinning without bonding Nitrogen-doped-porous carbon nanofiber sodium-ion battery negative electrode material with additives and conductive agents is used to solve the problem of poor electrical conductivity of electrode materials, while the flexible carbon nanofiber membrane is conducive to the extraction and insertion of sodium ions in electrode materials, Alleviate the problem of volume expansion of electrode materials caused by sodium ion deintercalation

Method used

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  • Nitrogen-doped porous carbon nanofiber sodium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0034] In this embodiment, a method for preparing a nitrogen-doped-porous carbon nanofiber sodium-ion battery negative electrode material comprises the following steps:

[0035] (1) Take by weighing PVP solid 0.9g, be dissolved in the deionized water of 5.1g, fully stir 2h; Add the PTFE emulsion that the mass fraction of 3g is 60% again, stir 1h again, obtain electrospinning stoste; Polyvinylpyrrolidone ( PVP), molecular weight not less than 1,300,000;

[0036] (2) Use a 10mL syringe to draw 8mL of electrospinning stock solution, and spin in an electrospinning machine with a temperature of 25°C and a humidity of 35%; the distance between the needle and the receiver during spinning is 20cm, and the speed of the receiver is 100r / min, the needle advance speed is 1mL / h, and the voltage is 20kv; then the obtained fiber is dried in an oven at 80°C for 12h; The temperature was raised to 250°C for 3 hours at a heating rate of 1°C / min, and the fiber film was pre-oxidized to stabilize ...

Embodiment 2

[0042] This embodiment is basically the same as Embodiment 1, especially in that:

[0043] In this embodiment, a method for preparing a nitrogen-doped-porous carbon nanofiber sodium-ion battery negative electrode material comprises the following steps:

[0044] (1) Take by weighing PVP solid 0.3g, be dissolved in the deionized water of 5.1g, fully stir 1h; Add the PTFE emulsion that the mass fraction of 3g is 60% again, stir 2h again, obtain electrospinning stoste; Polyvinylpyrrolidone ( PVP), molecular weight not less than 1,300,000;

[0045] (2) Use a 10mL syringe to draw 8mL of electrospinning stock solution, and spin in an electrospinning machine with a temperature of 25°C and a humidity of 35%; the distance between the needle and the receiver during spinning is 20cm, and the speed of the receiver is 100r / min, the needle advance speed is 1mL / h, and the voltage is 20kv; then the obtained fiber is dried in an oven at 60°C for 18h; The temperature was raised to 280°C at a hea...

Embodiment 3

[0048] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0049] In this embodiment, a method for preparing a nitrogen-doped-porous carbon nanofiber sodium-ion battery negative electrode material comprises the following steps:

[0050] (1) Take by weighing PVP solid 0.6g, be dissolved in the deionized water of 5.1g, fully stir 2h; Add the PTFE emulsion that the mass fraction of 3g is 60% again, stir 1h again, obtain electrospinning stoste; Polyvinylpyrrolidone ( PVP), molecular weight not less than 1,300,000;

[0051] (2) Use a 10mL syringe to draw 8mL of electrospinning stock solution, and spin in an electrospinning machine with a temperature of 25°C and a humidity of 35%; the distance between the needle and the receiver during spinning is 20cm, and the speed of the receiver is 100r / min, the needle advance speed is 1mL / h, and the voltage is 20kv; then the obtained fiber is dried in an oven at 80°C for 12h; The temperatur...

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Abstract

The invention discloses a nitrogen-doped porous carbon nanofiber sodium ion battery negative electrode material and a preparation method thereof, and relates to the field of sodium ion secondary batteries. Polyvinylpyrrolidone (PVP) and polytetrafluoroethylene (PTFE) are used as raw materials; the nitrogen-doped porous carbon nanofiber sodium ion battery negative electrode material without the binder and the conductive agent is prepared through electrostatic spinning. Wherein the nitrogen-doped porous carbon fiber increases the conductivity, the porous structure is beneficial to infiltration of an electrolyte, and the flexible carbon nanofiber membrane is beneficial to relieving the problem of volume expansion of the electrode material caused by separation and embedding of sodium ions in the electrode material, so that the cycling stability of the material is improved. The material is stable in physicochemical property, wide in raw material source, low in cost, good in electrochemical performance and high in safety, and has relatively high rate capability and good cycling stability when being used as an electrode.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for sodium ion batteries, in particular to a nitrogen doped-porous carbon nanofiber sodium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Due to the global climate change problem brought about by the extensive exploitation and use of fossil energy, the development and use of clean energy has been greatly developed, and clean energy is discontinuous. Electrochemical energy storage technology is the key to solving the problem. Rechargeable and dischargeable "rocking chair" batteries represented by lithium-ion batteries have the advantages of high energy density, fast charge and discharge rate, and long cycle life, and have received extensive attention and research in the field of energy storage. However, with the intensification of energy problems and the increasing dependence of consumption and energy storage industries o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/054H01M4/1393H01M4/133D01F9/21D01F1/10
Inventor 乔芸刘逸杰李丽侴术雷
Owner SHANGHAI UNIV
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