A kind of cathode material of lithium-sulfur primary battery and preparation method thereof

A battery cathode and lithium-sulfur technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of difficult to fully utilize the active material of the sulfur cathode, battery capacity attenuation, loss of active materials, etc., and achieve excellent cycle stability, discharge Small capacity fading and improved conductivity

Active Publication Date: 2022-04-08
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

[0003] Although lithium-sulfur primary batteries have many advantages, there are still thorny problems that need to be solved in lithium-sulfur primary batteries: 1) sulfur is a resistivity as high as 2×10 at room temperature 23 Insulator of μΩ∙cm, the discharge product Li of lithium-sulfur primary batteries 2 S is also a high insulator, the high resistance of the two will make it difficult for the active material in the sulfur cathode to be fully utilized
2) Lithium-sulfur primary batteries will produce a variety of intermediate products lithium polysulfide (Li 2 S x , 2
3) As the storage time of the battery increases, the sulfur in the positive electrode will react with the lithium ions in the electrolyte to form soluble lithium polysulfides, which will gradually diffuse out of the positive electrode area, resulting in the loss of active materials
If the electrode volume expansion is serious, it will lead to battery failure

Method used

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  • A kind of cathode material of lithium-sulfur primary battery and preparation method thereof
  • A kind of cathode material of lithium-sulfur primary battery and preparation method thereof
  • A kind of cathode material of lithium-sulfur primary battery and preparation method thereof

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Embodiment 1

[0025] A lithium-sulfur primary battery cathode material is a chain-layer mesoporous carbon / sulfur composite material prepared by using attapulgite as a template and fructose as a carbon source.

[0026] The preparation method of the positive electrode material of the lithium-sulfur primary battery comprises the following steps:

[0027] (1) Purification and pretreatment of attapulgite: first, crush attapulgite with a mortar and pestle, sieve through a 180-mesh sieve, and dry at 80°C for 12 hours to obtain natural attapulgite; Then the obtained natural attapulgite was treated with 0.1mol / L hydrochloric acid solution under reflux conditions, and magnetically stirred for 30min to obtain the hydrochloric acid-treated product; finally, the hydrochloric acid-treated product was washed to pH=6 with deionized water, Dry at 80°C for 12 hours to complete the purification pretreatment of attapulgite;

[0028] (2) Preparation of mesoporous carbon material: first, impregnate and filter t...

Embodiment 2

[0034] The preparation method of the positive electrode material of the lithium-sulfur primary battery comprises the following steps:

[0035] (1) Purification and pretreatment of attapulgite: first, crush attapulgite with a mortar and pestle, sieve through a 180-mesh sieve, and dry at 80°C for 12 hours to obtain natural attapulgite; Then the obtained natural attapulgite was treated with 0.1mol / L hydrochloric acid solution under reflux conditions, and magnetically stirred for 30min to obtain the hydrochloric acid-treated product; finally, the hydrochloric acid-treated product was washed to pH=6 with deionized water, Dry at 80°C for 12 hours to complete the purification pretreatment of attapulgite;

[0036](2) Preparation of mesoporous carbon material: first, impregnate and filter the purified attapulgite obtained in step (1) with fructose and concentrated sulfuric acid at a molar mass ratio of 5:20:0.7 at room temperature to obtain a mixture; then The mixture was placed in a ...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur primary battery cathode material and a preparation method thereof. The positive electrode material is a chain-layered mesoporous carbon / sulfur composite material prepared with attapulgite as a template and fructose as a carbon source. The chain-layered porous structure can adapt to the volume expansion during charging and discharging, and enhances the structure Stability, and can well coat sulfur, inhibit the dissolution of polysulfides, improve the utilization of active materials, and provide a large number of electron and ion transmission channels, promote the electron and ion transmission rate, and then improve the Overall performance of lithium-sulfur primary batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur primary battery cathode material and a preparation method thereof. Background technique [0002] In recent years, with the rapid growth of demand for high-performance energy storage devices such as smart electronic products and electric vehicles, people have begun to look for new energy storage power sources with high specific energy. Among them, lithium-sulfur primary batteries have attracted much attention due to their high theoretical specific capacity. Industry favored. At the same time, elemental sulfur has the advantages of low cost, high safety performance, and environmental friendliness, making it one of the most promising candidates for the next-generation battery system. [0003] Although lithium-sulfur primary batteries have many advantages, there are still thorny problems that need to be solved in lithium-sulfur primary b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCH01M4/364H01M4/38H01M4/625Y02E60/10
Inventor 王新崔国梁
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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