Room temperature sodium-sulfur battery positive electrode material and preparation method and application thereof

A sodium-sulfur battery and cathode material technology, applied in battery electrodes, nanotechnology for materials and surface science, positive electrodes, etc., can solve low Coulombic efficiency, slow reaction kinetics volume expansion effect, poor cycle life, etc. problem, to achieve the effect of increasing energy density, increasing discharge voltage platform, and improving conductivity

Pending Publication Date: 2019-08-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor cycle life, low coulombic efficiency, slow reaction kinetics and serious volume expansion effect of the room temperature sodium-sulfur battery in the prior art, and to provide a preparation method for the positive electrode material of the room temperature sodium-sulfur battery

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  • Room temperature sodium-sulfur battery positive electrode material and preparation method and application thereof
  • Room temperature sodium-sulfur battery positive electrode material and preparation method and application thereof
  • Room temperature sodium-sulfur battery positive electrode material and preparation method and application thereof

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Embodiment 1

[0060] This embodiment provides a room-temperature sodium-sulfur battery positive electrode material, which is made of a nitrogen-doped nano-carbon layer coated with a vulcanized polyacrylonitrile material compounded by carbonization of PPy, and the particle size of the material is about 200 nm. The coating amount of the nitrogen-doped nano-carbon layer is 3%, the coating thickness is 5nm, and the mass fraction of sulfur in the final positive electrode material is 41%. Concrete preparation process is as follows:

[0061] S1. Mix 1g of polyacrylonitrile (Mw=150000) and 3g of commercial sulfur powder S 8 Blending was carried out in 200mL absolute ethanol solution, followed by high-energy ball milling for 6h at a rotation speed of 400rpm.

[0062] S2. Put the ball-milled sample into a tube furnace under the protection of argon for calcination at a temperature of 300° C. for 5 hours to obtain a vulcanized polyacrylonitrile precursor material.

[0063] S3. Weigh 30 μL of pyrrole ...

Embodiment 2

[0070] This embodiment provides a room-temperature sodium-sulfur battery positive electrode material, which is made of a nitrogen-doped nano-carbon layer coated with a vulcanized polyacrylonitrile material compounded by carbonization of PPy, and the particle size of the material is about 200 nm. The coating amount of the nitrogen-doped nano-carbon layer is 1%, the coating thickness is 3nm, and the mass fraction of sulfur in the final positive electrode material is 39%. Concrete preparation process is as follows:

[0071] S1. Mix 1g of polyacrylonitrile (Mw=150000) and 3g of commercial sulfur powder S 8 Blending was carried out in 200mL absolute ethanol solution, followed by high-energy ball milling for 6h at a rotation speed of 400rpm.

[0072] S2. Put the ball-milled sample into a tube furnace under the protection of argon for calcination at a temperature of 350° C. for 5 hours to obtain a vulcanized polyacrylonitrile precursor material.

[0073] S3. Weigh 10 μL of pyrrole ...

Embodiment 3

[0080] This embodiment provides a room-temperature sodium-sulfur battery positive electrode material, which is made of a nitrogen-doped nano-carbon layer coated with a vulcanized polyacrylonitrile material compounded by carbonization of PPy, and the particle size of the material is about 200 nm. The coating amount of the nitrogen-doped nano-carbon layer is 3%, the coating thickness is 5nm, and the mass fraction of sulfur in the final positive electrode material is 31%. Concrete preparation process is as follows:

[0081] S1. Mix 1g of polyacrylonitrile (Mw=150000) and 3g of commercial sulfur powder S 8 Blending was carried out in 200mL absolute ethanol solution, followed by high-energy ball milling for 6h at a rotation speed of 400rpm.

[0082] S2. Put the ball-milled sample into a tube furnace under the protection of argon for calcination at a temperature of 390° C. for 7 hours to obtain a vulcanized polyacrylonitrile precursor material.

[0083] S3. Weigh 30 μL of pyrrole ...

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Abstract

The invention relates to a room temperature sodium-sulfur battery positive electrode material and a preparation method and an application thereof. The preparation method comprises the steps of S1, blending polyacrylonitrile and sulfur powder, ball milling and calcining to obtain a sulfurized polyacrylonitrile precursor material; S2, polymerizing pyrrole monomers on the precursor material in situ to obtain a polypyrrole (PPy) nanolayer; S3, annealing the material obtained in the step S2 to obtain the room temperature sodium-sulfur battery positive electrode material. The surface of sulfurized polyacrylonitrile is coated with an N-doped carbon layer, thereby being capable of well playing a role of protecting and stabilizing the electrode. Meanwhile, the doping of the element N can acceleratethe kinetic process of the electrochemical reaction, reduce the polarization in the electrochemical reaction process, improve the discharge voltage platform of the battery and thus improve the energydensity of the battery. Furthermore, the positive electrode material is carbonized at a low temperature, thereby avoiding the loss of sulfur; and the obtained positive electrode material has excellent cycle performance, stable Coulomb efficiency, high specific capacity and excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of sodium-sulfur batteries, and in particular relates to a room-temperature sodium-sulfur battery cathode material and a preparation method and application thereof. Background technique [0002] Due to the high energy density of lithium-sulfur batteries and the cost of sulfur cathodes, scientists have conducted extensive and in-depth research on lithium-sulfur batteries in the past two decades. However, from the perspective of sustainability and economy, since the Li content in the earth's crust is limited (0.0065%), it is a rare metal, so it seems to be a better choice to replace lithium and sulfur with sodium to form a high-capacity battery, especially for for large-scale energy storage systems. In the past few years, high-temperature sodium-sulfur batteries (temperatures greater than 300 °C) have been successfully commercialized for use in static energy storage systems. However, the traditional sodium-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054B82Y30/00
CPCH01M4/366H01M4/38H01M4/628H01M4/625H01M10/054B82Y30/00H01M2004/028Y02E60/10
Inventor 施志聪黄新月刘军
Owner GUANGDONG UNIV OF TECH
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