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Lithium-sulfur battery positive electrode material and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of low energy output, affect the electrochemical performance of lithium-sulfur batteries, and reduce battery capacity, and achieve high output and industrial feasibility. properties, fast electron transfer pathway, and the effect of small discharge capacity decay

Active Publication Date: 2020-11-06
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "shuttle effect" causes a significant change in the volume of the lithium-sulfur battery, which seriously affects the structure and cycle stability of the positive electrode; (3) the conductivity of sulfur is very poor, and the volume change of sulfur during charging and discharging will affect the stability of the battery; (4) The reaction between sulfur and lithium makes the battery volume larger, and the resulting product lithium sulfide will be crushed due to the volume change, resulting in the separation of more and more sulfur from the carrier in subsequent charge-discharge cycles, resulting in a decrease in battery capacity
Therefore, the problems in the sulfur cathode seriously affect the electrochemical performance of lithium-sulfur batteries.
At the same time, metal lithium as the negative electrode will also have some adverse effects. The electrolyte will be reduced on the surface of lithium, forming a solid electrolyte interface film, resulting in reduced capacity, low energy output, and more lithium will be consumed in practical applications; The activity is very high, and dendrites may be generated during the charge and discharge process, resulting in short circuit of the battery

Method used

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  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof

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Embodiment 1

[0028] The positive electrode material of the lithium-sulfur battery is a composite material of coaxial titanium nitride / vanadium nitride fiber and sulfur with a mesoporous core-shell structure.

[0029] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0030] (1) Preparation of titanium dioxide precursor sol: Add 0.6g of PVP powder to the mixed solution of isopropanol and tetrabutyl titanate, and stir at room temperature for 12 hours to obtain a uniform titanium dioxide precursor sol; wherein the mixed solution contains isopropanol is 7mL, tetrabutyl titanate is 1mL;

[0031] (2) Preparation of vanadium pentoxide precursor sol: first add 0.8g of PVP powder to the mixed solution of ethylene glycol and absolute ethanol, stir at room temperature for 12h; then add 0.3g of vanadium(III) acetylacetonate to the mixed solution , and stirred at 80°C for 60 minutes, and cooled naturally to room temperature to obtai...

Embodiment 2

[0038] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0039] (1) Preparation of titanium dioxide precursor sol: 0.5g of PVP powder was added to the mixed solution of isopropanol and tetrabutyl titanate, stirred at room temperature for 8h, and a uniform titanium dioxide precursor sol was prepared; the mixed solution contained isopropanol 7mL, tetrabutyl titanate 1mL;

[0040] (2) Preparation of vanadium pentoxide precursor sol: first add 0.6g of PVP powder to the mixed solution of ethylene glycol and absolute ethanol, stir at room temperature for 8h; then add 0.2g of vanadium(III) acetylacetonate to the mixed solution , and stirred at 60°C for 30 minutes, and cooled naturally to room temperature to obtain a uniform vanadium pentoxide precursor sol; the ethylene glycol in the mixed solution was 2mL, and the absolute ethanol was 6mL;

[0041] (3) Preparation of coaxial titanium nitride / vanadium nitride fib...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a lithium-sulfur battery positive electrode material and a preparation method thereof. The positive electrode material is a coaxial titanium nitride / vanadium nitride fiber and sulfur composite material with a mesoporous core-shell structure. The composite material has a unique space structure anda relatively high specific surface area, can effectively reduce a diffusion path of lithium ions, provides a rapid electron transfer path and an effective buffer space for sulfur, and remarkably improves the electrochemical performance of the positive electrode material of the lithium-sulfur battery. According to the preparation method, coaxial electrospinning is adopted, large-scale production and low-cost industrialization of the coaxial titanium nitride / vanadium nitride fiber of the mesoporous core-shell structure are easy to achieve, and high yield and industrial feasibility are achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] In the era of rapid development of electronic information and industrial technology, the preparation of batteries with high specific capacity will greatly promote the use and promotion of electronic equipment and electric vehicles. The theoretical specific capacity of lithium-sulfur batteries is more than 6 times that of the existing common commercial lithium-ion batteries, and the cost is low, so it has broad application prospects. Lithium-sulfur battery as a secondary battery with high energy density The system uses elemental sulfur as the positive electrode material, with a theoretical specific capacity of 1675mAh / g, and a battery composed of metal lithium as the negative electrode, with a theoretical energy density of 2600Wh / kg. In addition, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052B82Y40/00
CPCH01M4/38H01M4/626H01M4/628H01M10/052B82Y40/00H01M2004/028Y02E60/10
Inventor 王新王彤
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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