Preparation method and application of porous carbon fiber/tungsten oxide self-supporting lithium-sulfur battery positive electrode material

A porous carbon fiber, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of reducing active sulfur utilization, electron/ion kinetic performance, reducing battery energy density, increasing electrode internal resistance, etc. , to achieve the effect of shortening the electron/ion transmission path, excellent conductivity and low cost

Active Publication Date: 2022-01-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conductive agents, binders, and current collectors do not contribute to the capacity of the battery, resulting in a decrease in the overall energy density of the battery. At the same time, the use of electrochemically inert binders can also cause adverse side reactions, cover the reactive sites, and increase the energy density of the battery. Large electrode internal resistance, which reduces active sulfur utilization and electron / ion kinetics

Method used

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  • Preparation method and application of porous carbon fiber/tungsten oxide self-supporting lithium-sulfur battery positive electrode material
  • Preparation method and application of porous carbon fiber/tungsten oxide self-supporting lithium-sulfur battery positive electrode material
  • Preparation method and application of porous carbon fiber/tungsten oxide self-supporting lithium-sulfur battery positive electrode material

Examples

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Effect test

Embodiment 1

[0036] The preparation method of a porous carbon fiber / tungsten oxide self-supporting lithium-sulfur battery cathode material in this example is as follows:

[0037] 1. Commercial carbon cloth (CC) was ultrasonically treated with acetone, ethanol, and deionized water for 10 minutes, and dried at 60°C for 10 hours. CC was used as the working electrode, Pt was used as the counter electrode, and Ag / AgCl was used as the reference electrode. A three-electrode system was used. Electrodeposit nickel hydroxide, dry at 60°C for 10 hours, then reduce in nitrogen at 800°C at high temperature, heating rate 5°C / min, keep warm for 4 hours, then pickle with 3M hydrochloric acid for 6 hours, wash and dry to obtain porous carbon fiber cloth PCC;

[0038] 2. Weigh 1.75g ​​(NH 4 ) 2 SO 4 , added to 30mL precursor solution containing tungsten source, wherein the precursor solution is 0.125MNaWO 4 and 0.1M H 2 C 2 o 4 After stirring the mixed solution for 1 hour, put the PCC obtained in Step...

Embodiment 2

[0052] The preparation method of a porous carbon fiber / tungsten oxide self-supporting lithium-sulfur battery cathode material in this example is as follows:

[0053] 1. Commercial carbon cloth (CC) was ultrasonically treated with acetone, ethanol, and deionized water for 10 minutes, and dried at 60°C for 10 hours. CC was used as the working electrode, Pt was used as the counter electrode, and Ag / AgCl was used as the reference electrode. A three-electrode system was used. A layer of nickel hydroxide was electrodeposited, dried at 60°C for 10 hours, then reduced in nitrogen at 800°C at a high temperature, the heating rate was 5°C / min, kept for 4 hours, then pickled with 3M hydrochloric acid for 6 hours, washed and dried to obtain porous carbon fiber cloth PCC;

[0054] 2. Weigh 1.75g ​​(NH 4 ) 2 SO 4 , added to 30mL precursor solution containing tungsten source, wherein the precursor solution is 0.125MNaWO 4 and 0.1M H 2 C 2 o 4 After stirring the mixed solution for 1 hour...

Embodiment 3

[0058] The preparation method of a carbon fiber / tungsten oxide self-supporting lithium-sulfur battery cathode material in this embodiment is as follows:

[0059] 1. Commercial carbon cloth (CC) was ultrasonically treated with acetone, ethanol, and deionized water for 10 minutes, and dried at 60°C for 10 hours.

[0060] 2. Weigh 1.75g ​​(NH 4 ) 2 SO 4 , added to 30mL precursor solution containing tungsten source, wherein the precursor solution is 0.125MNaWO 4 and 0.1M H 2 C 2 o 4 After stirring the mixed solution for 1 hour, arrange the carbon obtained in step 1 in the precursor solution, then transfer it to the reaction kettle, and conduct a hydrothermal reaction at 160°C for 8 hours. After the reaction, wash repeatedly, and dry at 60°C for 10 hours to obtain The carbon fiber cloth with tungsten oxide precursor grown on the surface is sent to a tube furnace for annealing treatment. Under an argon protective atmosphere, the temperature is kept at 400°C for 3 hours, and the ...

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Abstract

The invention discloses a preparation method and application of a porous carbon fiber / tungsten oxide self-supporting lithium-sulfur battery positive electrode material, and the self-supporting lithium-sulfur battery positive electrode material is composed of active sulfur and porous carbon fiber / tungsten oxide. The porous carbon fiber / tungsten oxide is a self-supporting conductive sulfur carrier which takes porous carbon fiber cloth as a substrate and then grows tungsten oxide nanorods through combination of a simple one-step hydrothermal method and low-temperature calcination treatment, and finally sulfur is loaded through a hot melting method to obtain the sulfur positive electrode. According to the self-supporting lithium-sulfur battery positive electrode material disclosed by the invention, good mechanical strength and excellent conductivity of the porous carbon fiber and an adsorption-catalysis effect of the tungsten oxide nanorod on soluble polysulfide are organically combined, so that high load of sulfur is realized, and the conductivity of the whole material is improved; and the shuttle effect can be effectively inhibited, and the volume change of the electrode can be relieved, so that the cycle performance of the lithium-sulfur battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and devices, and in particular relates to a preparation method and application of a porous carbon fiber / tungsten oxide self-supporting lithium-sulfur battery cathode material. Background technique [0002] With the popularization of portable electronic products and the rapid development of electric vehicles, the requirements for energy storage technology are getting higher and higher. The energy density and power density of traditional lithium-ion batteries are difficult to meet the growing energy storage needs of new devices and equipment. Lithium-sulfur batteries have high specific capacity (1675mAh / g) and specific energy (2600Wh / kg), which are several times that of current commercial lithium-ion batteries, and the positive electrode active material sulfur is abundant, cheap, and environmentally friendly, so lithium-sulfur batteries Sulfur batteries have great development potential ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052B82Y30/00B82Y40/00
CPCH01M4/625H01M4/628H01M4/38H01M10/052B82Y30/00B82Y40/00H01M2004/028H01M2004/021Y02E60/10
Inventor 吴玉程王忠杰闫健郭庆崔接武刘家琴
Owner HEFEI UNIV OF TECH
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