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Preparation method and application of oxygen vacancy containing manganese/sulfur dioxide composite

A technology of manganese dioxide and composite materials, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., to achieve good catalytic activity, clean and environmentally friendly preparation process, and reduce dissolution

Inactive Publication Date: 2017-07-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the focus of researchers is mainly on how to inhibit the shuttle effect, and few people have considered the reaction progress of the catalyzed lithium-sulfur battery discharge process. If the conversion process of lithium polysulfide to lithium sulfide is accelerated, it will also indirectly inhibit lithium polysulfide. Dissolution, thereby improving the cycle performance of lithium-sulfur batteries

Method used

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  • Preparation method and application of oxygen vacancy containing manganese/sulfur dioxide composite
  • Preparation method and application of oxygen vacancy containing manganese/sulfur dioxide composite
  • Preparation method and application of oxygen vacancy containing manganese/sulfur dioxide composite

Examples

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Effect test

Embodiment 1

[0024] (1) Take 0.397g of potassium permanganate, dissolve it in 24mL of deionized water, stir for 30min, slowly add 6mL of 1mol / L dilute hydrochloric acid, continue stirring for 30min, transfer the solution to a 50mL polytetrafluoroethylene reaction kettle, 150℃ After hydrothermal heating for 6 hours, the obtained hydrothermal product was centrifuged and dried to obtain manganese dioxide;

[0025] (2) Take 0.1 g of the prepared manganese dioxide and heat it at 200°C for 2 hours under a hydrogen-argon mixed gas atmosphere to obtain manganese dioxide containing oxygen vacancies;

[0026] (3) Grind 50 mg of manganese dioxide containing oxygen vacancies and 200 mg of pure sulfur evenly, put them into a tube furnace, pass argon as a protective gas, and calcinate at 155°C for 12 hours to obtain MnO 2-x / S Composite.

Embodiment 2

[0028] (1) Take 0.397g of potassium permanganate, dissolve it in 24mL of deionized water, stir for 30min, slowly add 6mL of 1mol / L dilute hydrochloric acid, continue stirring for 30min, transfer the solution to a 50mL polytetrafluoroethylene reaction kettle, 150℃ After hydrothermal heating for 6 hours, the obtained hydrothermal product was centrifuged and dried to obtain manganese dioxide;

[0029] (2) Take 0.1 g of the prepared manganese dioxide and heat it at 200° C. for 2 hours in a hydrogen-argon mixed gas atmosphere to obtain manganese dioxide containing oxygen vacancies;

[0030] (3) Grind 50 mg of manganese dioxide containing oxygen vacancies and 200 mg of pure sulfur evenly, put them into a tube furnace, pass argon as a protective gas, and calcinate at 155°C for 12 hours to obtain MnO 2-x / S Composite.

Embodiment 3

[0032] (1) Take 0.397g of potassium permanganate, dissolve it in 24mL of deionized water, stir for 30min, slowly add 12mL of 1mol / L dilute hydrochloric acid, continue stirring for 30min, transfer the solution to a 50mL polytetrafluoroethylene reactor, 150℃ After hydrothermal heating for 6 hours, the obtained hydrothermal product was centrifuged and dried to obtain manganese dioxide;

[0033] (2) Take 0.1 g of the prepared manganese dioxide and heat it at 300° C. for 2 hours under a hydrogen-argon mixed gas atmosphere to obtain manganese dioxide containing oxygen vacancies;

[0034] (3) Grind 50 mg of manganese dioxide containing oxygen vacancies and 200 mg of pure sulfur evenly, put them into a tube furnace, pass argon as a protective gas, and calcinate at 155°C for 12 hours to obtain MnO 2-x / S Composite.

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Abstract

The invention discloses a preparation method and application of an oxygen vacancy containing manganese / sulfur dioxide composite. The method comprises the following steps: (1) heating manganese dioxide under the protection of an inert gas to obtain oxygen vacancy containing manganese dioxide; and (2) mixing oxygen vacancy containing manganese dioxide with elemental sulfur, heating, and calcining to obtain the oxygen vacancy containing manganese / sulfur dioxide composite. Compared with the prior art, the preparation method has the following beneficial effects: (1) manganese dioxide has an excellent capability of adsorbing lithium polysulfide, and the stability of a lithium-sulfur battery is improved; (2) oxygen vacancy containing manganese dioxide has an excellent catalytic activity, can promote the transformation of lithium polysulfide to lithium sulfide, catalyzes the discharge process of the lithium-sulfur battery, and reduces the dissolution of lithium polysulfide; and (3) the content of oxygen vacancy in manganese dioxide is controlled through different calcining temperatures and time, so that the whole performances of the lithium-sulfur battery is controlled.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a preparation method and application of a manganese dioxide / sulfur composite material, in particular to a preparation method and application of a manganese dioxide / sulfur composite material containing oxygen vacancies. Background technique [0002] With the development of the portable electronics industry, the demand for high specific energy batteries is more urgent, limited by the specific capacity of traditional lithium cobalt oxide, lithium manganate and other materials, lithium ion batteries can no longer meet the current demand. It is imperative to seek a secondary battery with higher specific capacity. Lithium-sulfur batteries have attracted great attention from researchers in recent years. Due to its high specific capacity (1675mAh / g), low cost, wide source of elemental sulfur, and non-toxicity, it is very promising to become the next generation of secondary batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/38H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/50H01M10/052Y02E60/10
Inventor 张乃庆吴宪孙克宁范立双
Owner HARBIN INST OF TECH
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