Three-dimensional tubular structured manganese dioxide sulfur supported composite material as well as preparation method, lithium-sulfur battery anode and lithium-sulfur battery

A manganese dioxide, three-dimensional tubular technology, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of poor cycle performance of lithium-sulfur batteries, restricting the marketization of lithium-sulfur batteries, and poor rate performance, etc. Chemical properties, inhibition of polysulfide shuttle, effect of high specific capacity

Active Publication Date: 2018-09-07
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of elemental sulfur itself is poor, the volume changes greatly, and the polysulfides formed with lithium ions during charge and discharge are easily soluble in organic electrolytes. These deficiencies lead to poor cycle performance of lithium-sulfur batteries. Low capacity and poor rate performance restrict the further marketization of lithium-sulfur batteries

Method used

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  • Three-dimensional tubular structured manganese dioxide sulfur supported composite material as well as preparation method, lithium-sulfur battery anode and lithium-sulfur battery
  • Three-dimensional tubular structured manganese dioxide sulfur supported composite material as well as preparation method, lithium-sulfur battery anode and lithium-sulfur battery
  • Three-dimensional tubular structured manganese dioxide sulfur supported composite material as well as preparation method, lithium-sulfur battery anode and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of the composite material of manganese dioxide loaded with sulfur in three-dimensional tubular structure comprises the following steps:

[0044] 1) 1.0g of zinc nitrate hexahydrate and 1.5g of potassium hydroxide were respectively dissolved in 10mL of water, and the resulting solution was stirred for 10 minutes and then mixed evenly. The mixed solution was put into an oven and reacted at a constant temperature of 40°C for 9 hours. The precipitate was collected, centrifuged, washed, and dried under vacuum at 30°C for 18 hours.

[0045] 2) Take 0.4g of potassium permanganate powder, dissolve it in 40mL of water, and stir. Take 0.2g of zinc oxide and potassium permanganate solution into a 50mL reaction kettle, and react at 130°C for 16 hours. The product was taken out, washed by centrifugal precipitation, and vacuum-dried at 40° C. for 12 hours to obtain a zinc oxide / manganese dioxide product.

[0046] 3) Weigh 0.1g of zinc oxide / manganese dioxide ...

Embodiment 2

[0051] The preparation method of the composite material of manganese dioxide loaded with sulfur in three-dimensional tubular structure comprises the following steps:

[0052] 1) 1.2g of zinc nitrate hexahydrate and 1.8g of potassium hydroxide were dissolved in 10mL of water respectively, and the resulting solutions were stirred for 10 minutes and then mixed evenly. The mixed solution was put into an oven and reacted at a constant temperature of 45°C for 9 hours. After the reaction was completed, the precipitate was collected, centrifuged, washed, and vacuum-dried at 40° C. for 16 hours.

[0053] 2) Take 0.5g of potassium permanganate powder, dissolve it in 40mL of water, and stir. Take 0.2g of zinc oxide and potassium permanganate solution into a 50mL reaction kettle, and react at 150°C for 14 hours. The product was taken out, washed by centrifugal precipitation, and vacuum-dried at 50° C. for 16 hours to obtain a zinc oxide / manganese dioxide product.

[0054] 3) Weigh 0.1g ...

Embodiment 3

[0059] The preparation method of the composite material of manganese dioxide loaded with sulfur in three-dimensional tubular structure comprises the following steps:

[0060] 1) 1.5g of zinc nitrate hexahydrate and 2.0g of potassium hydroxide were respectively dissolved in 10mL of water, and the resulting solutions were stirred for 10 minutes and then mixed evenly. The mixed solution was put into an oven and reacted at a constant temperature of 50°C for 8 hours. After the reaction was completed, the precipitate was collected, centrifuged, washed, and vacuum-dried at 50° C. for 14 hours.

[0061] 2) Take 0.6g of potassium permanganate powder, dissolve it in 40mL of water, and stir. Take 0.2g of zinc oxide and potassium permanganate solution into a 50mL reaction kettle, and react at 160°C for 12 hours. The product was taken out, washed by centrifugal precipitation, and vacuum-dried at 60° C. for 14 hours to obtain a zinc oxide / manganese dioxide product.

[0062] 3) Weigh 0.1g ...

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Abstract

The invention provides a three-dimensional tubular structured manganese dioxide sulfur supported composite material as well as a preparation method, a lithium-sulfur battery anode and a lithium-sulfurbattery. Compared with the prior art, the manganese dioxide sulfur supported composite material is obtained by preparing a radiation zinc oxide three-dimensional nanorod with a hydrothermal method, growing manganese oxide on zinc oxide with the hydrothermal method, washing off the zinc oxide by hydrochloric acid, and finally supporting sulfur granules in a sulfur fumigation mode. The product is high in purity and can be applied to a lithium-sulfur battery anode material. By adopting the composite material, difficulties such as polysulfide shuttling can be effectively solved, a composite material preparation method which is simple in process and low in cost is provided, and the lithium-sulfur battery anode material which is good in circulation stability and high in specific capacity can beprepared.

Description

technical field [0001] The invention relates to the field of preparation of new energy materials, in particular to a three-dimensional tubular structure manganese dioxide-loaded sulfur composite material and a preparation method, a positive electrode of a lithium-sulfur battery, and a lithium-sulfur battery. Background technique [0002] Since the industrial revolution, the economic growth model of high consumption and high consumption has created a huge material wealth, and it has also caused human beings to taste the bitter fruit. The storage of non-renewable energy is decreasing, the climate environment is getting worse, and the ecosystem is becoming more and more fragile. It is of great significance to develop secondary batteries with high energy density, long cycle life, high safety, green environmental protection and low cost in the field of new energy. [0003] Elemental sulfur has become a research hotspot because of its abundant reserves, low price, environmental fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 刘金云张文周萍李金金黄家锐
Owner ANHUI NORMAL UNIV
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