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Preparation method of sulfur-fixation carrier material for positive electrode of lithium-sulfur battery

A lithium-sulfur battery and sulfur carrier technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve environmental hazards and other problems, and achieve good rate capacity, good discharge capacity, and significant rate performance.

Inactive Publication Date: 2021-07-16
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

Hard templates using calcium carbonate or silica usually require removal of the template with environmentally harmful reagents such as hydrogen fluoride or other strong acids, which are environmentally harmful

Method used

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  • Preparation method of sulfur-fixation carrier material for positive electrode of lithium-sulfur battery
  • Preparation method of sulfur-fixation carrier material for positive electrode of lithium-sulfur battery
  • Preparation method of sulfur-fixation carrier material for positive electrode of lithium-sulfur battery

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Embodiment 1

[0031] The preparation method of the positive electrode sulfur-fixed carrier material of the lithium-sulfur battery comprises the following steps:

[0032] (1) Preparation of sponge-like porous g-C 3 N 4 : First, dissolve 1.5g of melamine in 90mL of deionized water, stir and dissolve at 90°C for 60 minutes to obtain a clear solution; After filtration, the precipitate was obtained; finally, the precipitate was heated up to 520°C at a rate of 2°C / min, and calcined in the air at 520°C for 4 hours to obtain a sponge-like porous g-C with a 3D network composed of porous nanosheets 3 N 4 ;

[0033] (2) Synthesis of in situ g-C 3 N 4 / CNT composite material: first, 0.2 g of the sponge-like porous g-C obtained in step (1) 3 N 4 Dissolve in 150mL deionized water, and make a suspension after ultrasonic treatment for 60min; then add 0.14gCNT into the prepared suspension, stir for 4h and dry at 60°C to obtain g-C 3 N 4 / CNT powder;

[0034] (3) g-C 3 N 4 / CNT composite material...

Embodiment 2

[0039] The preparation method of the positive electrode sulfur-fixed carrier material of the lithium-sulfur battery comprises the following steps:

[0040] (1) Preparation of sponge-like porous g-C 3 N 4 : Firstly, 1.0g melamine was dissolved in 60mL deionized water and stirred at 85°C for 30min to obtain a clear solution; After filtration, the precipitate was obtained; finally, the precipitate was heated up to 520°C at a rate of 3°C / min, and calcined in the air at 520°C for 3 hours to obtain a sponge-like porous g-C with a 3D network composed of porous nanosheets. 3 N 4 ;

[0041] (2) Synthesis of in situ g-C 3 N 4 / CNT composite material: first, 0.2 g of the sponge-like porous g-C obtained in step (1) 3 N 4 Dissolve in 150mL deionized water, and make a suspension after ultrasonic treatment for 60min; then add 0.14g of CNT to the prepared suspension, stir for 6h and dry at 60°C to obtain g-C 3 N 4 / CNT powder;

[0042] (3) g-C 3 N 4 / CNT composite material doped w...

Embodiment 3

[0044] The preparation method of the positive electrode sulfur-fixed carrier material of the lithium-sulfur battery comprises the following steps:

[0045] (1) Preparation of sponge-like porous g-C 3 N 4 : Firstly, dissolve 1.5g melamine in 100mL deionized water, stir and dissolve at 85°C for 30min to obtain a clear solution; then place the obtained clear solution in a 150mL polytetrafluoroethylene stainless steel autoclave, keep it warm at 195°C for 24h, and cool After filtration, the precipitate was obtained; finally, the precipitate was heated up to 520°C at a rate of 4°C / min, and calcined in the air at 520°C for 3 hours to obtain a sponge-like porous g-C with a 3D network composed of porous nanosheets. 3 N 4 ;

[0046] (2) Synthesis of in situ g-C 3 N 4 / CNT composite material: first, 0.2 g of the sponge-like porous g-C obtained in step (1) 3 N 4 Dissolved in 200mL of deionized water, ultrasonic treatment for 60min to make a suspension; then add 0.14g of CNT to the ...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and relates to a preparation method of a sulfur-fixation carrier material for a positive electrode of a lithium-sulfur battery. The preparation method comprises the following steps of: (1) preparing sponge-like porous g-C3N4; (2) synthesizing an in-situ g-C3N4 / CNT composite material; and (3) doping sulfur into the g-C3N4 / CNT composite material. The g-C3N4 / CNT composite material with unique morphological characteristics prepared by the preparation method is used for the sulfur fixation carrier material of the positive electrode, and can effectively replace and adsorb polysulfide to realize rapid transfer of charges.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a preparation method of a positive electrode sulfur-fixed carrier material of a lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery (LSB) uses sulfur as the positive electrode material, metal lithium as the negative electrode material, and uses a porous polymer separator to separate the positive and negative electrodes. The organic electrolyte / solid electrolyte is used as the electrolyte, and the theoretical energy density reaches 2600Wh. kg -1 , much higher than the current commercial lithium-ion batteries. In addition, lithium-sulfur batteries have the advantages of rich sulfur content, low cost, and environmental friendliness, making them expected to replace lithium-ion batteries as the next-generation energy storage system. [0003] At present, in the actual application process of lithium-sulfur batteries, due to the dis...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M10/052
CPCH01M4/38H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 王新曾琴丹
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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