Sodium-ion battery negative electrode material, preparation method thereof and sodium-ion battery negative electrode

A technology for sodium ion batteries and negative electrode materials, which is applied in battery electrodes, nanotechnology for materials and surface science, and negative electrodes, etc., can solve problems such as the conductivity, rate performance and cycle performance of sodium ion batteries need to be improved. Improve rate performance and charge and discharge capacity, excellent electrical conductivity, and the effect of expanding contact area

Pending Publication Date: 2022-03-04
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the application provides a negative electrode material for a sodium ion battery and a preparation method thereof and a negative electrode for a sodium ion battery, while solving the problem of the conduct

Method used

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  • Sodium-ion battery negative electrode material, preparation method thereof and sodium-ion battery negative electrode
  • Sodium-ion battery negative electrode material, preparation method thereof and sodium-ion battery negative electrode
  • Sodium-ion battery negative electrode material, preparation method thereof and sodium-ion battery negative electrode

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Embodiment 1

[0045] The present embodiment 1 provides the first negative electrode material for sodium ion batteries, comprising the following steps:

[0046] Step 1. Weigh 1.5g of PVP, 4g of PTFE emulsion, and 1.2g of ammonium metatungstate, dissolve them in 15ml of distilled aqueous solution and magnetically stir for 12 hours to form a uniform milky white solution to obtain a carbon nanofiber precursor solution;

[0047] Step 2. Put the carbon nanofiber precursor solution prepared in step 1 into a 10ml syringe as a spinning solution, apply a voltage of 10kV, collect a distance of 12cm, and inject the solution at a rate of 0.02mm / min through electrospinning technology. silk for 8 hours, followed by drying in a vacuum oven for 2 hours to obtain carbon nanofibers;

[0048] Step 3. Transfer the carbon nanofiber prepared in step 2 into a high-temperature tube furnace, and heat it from room temperature to 250° C. for 1 hour at a heating rate of 2° C. / min in an air atmosphere to obtain a pre-ox...

Embodiment 2

[0051] This embodiment 2 provides the second negative electrode material for sodium ion batteries, comprising the following steps:

[0052] Step 1. Dissolve 1.5g of PVP, 4g of PTFE emulsion, and 1.5g of ammonium metatungstate in 15ml of distilled water and stir for 12 hours to form a uniform milky white solution to obtain a carbon nanofiber precursor solution;

[0053] Step 2. Put the carbon nanofiber precursor solution prepared in step 1 into a 10ml syringe as a spinning solution, apply a voltage of 14kV through electrospinning technology, collect a distance of 12cm, and inject the solution at a rate of 0.05mm / min. Spinning for 8 hours, followed by drying in a vacuum oven for 2 hours to obtain carbon nanofibers;

[0054] Step 3. Transfer the carbon nanofiber prepared in step 2 into a high-temperature tube furnace, and heat it from room temperature to 250° C. for 1 hour at a heating rate of 2° C. / min in an air atmosphere to obtain a pre-oxidized fiber film;

[0055] Step 4, t...

Embodiment 3

[0057] This embodiment 3 provides the third negative electrode material for sodium ion batteries, comprising the following steps:

[0058] Step 1. Dissolve 1.5g of PVP, 6g of PTFE emulsion, and 1.2g of ammonium metatungstate in 15ml of distilled aqueous solution and stir for 12 hours to form a uniform milky white solution to obtain a carbon nanofiber precursor solution;

[0059] Step 2. Put the carbon nanofiber precursor solution prepared in step 1 into a 10ml syringe as a spinning solution, apply a voltage of 12kV through electrospinning technology, collect a distance of 12cm, and inject the solution at a rate of 0.02mm / min. Spinning for 8 hours, followed by drying in a vacuum oven for 2 hours to obtain carbon nanofibers;

[0060] Step 3. Transfer the carbon nanofiber prepared in step 2 into a high-temperature tube furnace, and heat it from room temperature to 250° C. for 1 hour at a heating rate of 2° C. / min in an air atmosphere to obtain a pre-oxidized fiber film;

[0061]...

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Abstract

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a sodium-ion battery negative electrode material, a preparation method thereof and a sodium-ion battery negative electrode. The sodium-ion battery negative electrode material comprises porous carbon nanofibers and tungsten diselenide nanoparticles, the carbon nanofibers are carbon materials, the carbon nanofibers and the tungsten diselenide nanoparticles are both of nanometer sizes, and the carbon nanofibers are of a porous structure, so that the carbon nanofibers are uniform in particle size. And the buffer space is provided during the deintercalation, so that the technical problem that the conductivity, the rate capability and the cycle performance of the sodium ion battery need to be improved when the tungsten diselenide is used as the negative electrode material of the sodium ion battery in the prior art is solved at the same time.

Description

technical field [0001] The application belongs to the technical field of sodium ion batteries, and in particular relates to a sodium ion battery negative electrode material, a preparation method thereof and a sodium ion battery negative electrode. Background technique [0002] The shortage and uneven distribution of lithium resources limit the further development and application of lithium-ion batteries. Therefore, it is necessary to develop and design new energy storage devices to replace traditional fossil energy and achieve sustainable development; Elemental sodium has similar chemical properties, and it also has an excellent energy storage mechanism as an electrode material. At the same time, sodium metal resources are abundant on the earth, far greater than lithium metal reserves. Apps offer great advantages. [0003] The composition of sodium-ion batteries is the same as that of lithium-ion batteries. They are composed of positive electrode materials, negative electro...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCH01M4/581H01M4/625H01M10/054B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 温道锋张海燕林梓华
Owner GUANGDONG UNIV OF TECH
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