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An active MNO based 2 Preparation method of catalyzed lithium-sulfur battery cathode

A technology of lithium-sulfur batteries and active manganese dioxide, which is applied in battery electrodes, lithium batteries, electrode manufacturing, etc., can solve the problem that the high ratio of mass and volume of inactive substances affects the practical application of lithium-sulfur batteries and reduces the advantages of lithium-sulfur batteries and other problems, to achieve the effect of suppressing the shuttle effect, facilitating high-rate discharge, and avoiding the loss of active material sulfur

Active Publication Date: 2021-09-28
天津赫维科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above method inhibits the dissolution of polysulfides and improves the cycle life of the sulfur electrode, the method is complicated, and the mass and volume ratio of inactive materials is very high, which seriously reduces the advantages of lithium-sulfur batteries in terms of specific energy. Affected the practical application of lithium-sulfur batteries

Method used

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  • An active MNO based <sub>2</sub> Preparation method of catalyzed lithium-sulfur battery cathode
  • An active MNO based <sub>2</sub> Preparation method of catalyzed lithium-sulfur battery cathode

Examples

Experimental program
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Embodiment 1

[0012] Preparation of active manganese dioxide: Weigh 108.79g manganese dioxide (produced in Hunan, battery grade, purity 91%), 0.51g Fe(NO 3 ) 3 9H 2 O (Tianjin Chemical Reagent Factory, analytically pure, purity 98.5%), 0.51g Ni(NO 3 ) 2 ·6H 2 O (Tianjin Chemical Reagent Factory, analytically pure, purity 98%) and 25.25 g of anhydrous LiNO 3 (Shanghai Zhongli, analytically pure, content 99%), put it in a ball mill tank, the ratio of ball to material is 3:1, the speed is 300 rpm, take it out after ball milling for 3 hours, and then put the powder in the sintering furnace at 1°C Raise the temperature to 350°C / min, keep it for 6 hours, take it out after cooling down to room temperature, and then ball mill it to 325 mesh to obtain active manganese dioxide powder.

[0013] Weigh 85g of nano-sulfur powder (Shanghai Yaotian New Material Technology Co., Ltd.), 10g of active manganese dioxide powder (self-made), 1g of 6mm chopped carbon fiber (Shanghai Lishuo Composite Material ...

Embodiment 2

[0017] Preparation of active manganese dioxide: same as Example 1.

[0018] Weigh 90g of nano-sulfur powder (Shanghai Yaotian New Material Technology Co., Ltd.), 5g of active manganese dioxide powder (self-made), 1g of 10mm chopped carbon fiber (Shanghai Lishuo Composite Material Technology Co., Ltd.) and 1g of multi-walled carbon nanotubes (Jiangsu Xianfeng Nano Material Technology Co., Ltd.), put it into a mortar, grind it evenly, pour it into a beaker, and add 97g of absolute ethanol, stir it with a glass rod to form a slurry, and then add 8.33g of 60% mass concentration Polytetrafluoroethylene emulsion, continue to stir to form a paste, use a scraper to spread the paste evenly on a 0.3mm thick hydrophilic carbon fiber cloth (Shanghai Lishuo Composite Material Technology Co., Ltd.), coating load 8mg / cm 2 . Then put it in an oven, heat to 120° C. to dry for 20 minutes under the condition of nitrogen protection, cool down, take it out, and obtain a sulfur electrode. On the ...

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Abstract

A kind of active MnO based 2 A method for preparing a positive electrode of a catalyzed lithium-sulfur battery, the preparation steps of which are: mixing nanometer sulfur elemental powder, active manganese dioxide powder, carbon fiber and carbon nanotube in a ratio (mass ratio) of 85~90:5~10:1:1 After mixing evenly, add anhydrous ethanol with the same quality as the mixture, stir to form a slurry, then add a certain amount of polytetrafluoroethylene (PTFE) emulsion, stir to form a paste, and spread the paste evenly on the carbon fiber cloth. Heating to 120° C. and drying for 20 minutes under the protection of nitrogen to obtain a sulfur electrode. By activating manganese dioxide to make it adsorb Fe, Ni and other particles on the surface, it can act as a catalyst for the redox of sulfur as a whole, and increase the charge and discharge current density of the sulfur electrode, which is conducive to high-rate discharge. The capacity per unit area of ​​the sulfur electrode can be increased, providing a basis for realizing a lithium-sulfur battery with a specific energy exceeding 700Wh / kg.

Description

technical field [0001] The present invention relates to a kind of active MnO-based 2 The invention discloses a method for preparing a positive electrode of a catalyzed lithium-sulfur battery, which belongs to the technical field of chemical power source energy storage. Background technique [0002] Lithium-sulfur batteries are a chemical power source with great development potential. The theoretical capacity of the sulfur cathode is as high as 1670mAh / g, and the theoretical specific energy of the lithium-sulfur battery reaches 2600Wh / kg. At the same time, lithium-sulfur batteries have little impact on the environment, and sulfur resources are very rich, cheap, and easy to mine. These advantages have prompted researchers to pay more and more attention to the development of lithium-sulfur batteries. [0003] The advantages of lithium-sulfur batteries are obvious, but there are still many problems to be solved urgently, mainly due to the poor conductivity and low utilization ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/139H01M4/04H01M10/052
CPCH01M4/0404H01M4/0471H01M4/139H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 郝德利叶丽光
Owner 天津赫维科技有限公司
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