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Lithium-sulfur battery positive electrode material based on catalytic transition metal oxide nanorods and preparation method of lithium-sulfur battery positive electrode material

A technology of transition metals and cathode materials, applied in the direction of lithium batteries, battery electrodes, active material electrodes, etc., can solve the problem of not fundamentally improving the rate performance of lithium-sulfur batteries, the reaction kinetics of lithium-sulfur batteries, and the electrochemical performance of batteries Instability and other problems, achieve good electrolyte affinity and adsorption, improve catalytic ability and structural stability, improve cycle stability and rate performance

Pending Publication Date: 2022-05-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these can solve the problem of reaction kinetics of lithium-sulfur batteries, and cannot fundamentally improve the rate performance of lithium-sulfur batteries.
In fact, the various lithium-sulfur battery cathode materials currently reported cannot completely solve the problems existing in lithium-sulfur batteries, and most of them are relatively complicated in the preparation process, and have common shortcomings, such as unstable electrochemical performance of the battery, large rate The discharge performance is poor, the shuttle effect of polysulfide is still obvious, the operation is difficult, and the production cost is high

Method used

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  • Lithium-sulfur battery positive electrode material based on catalytic transition metal oxide nanorods and preparation method of lithium-sulfur battery positive electrode material
  • Lithium-sulfur battery positive electrode material based on catalytic transition metal oxide nanorods and preparation method of lithium-sulfur battery positive electrode material
  • Lithium-sulfur battery positive electrode material based on catalytic transition metal oxide nanorods and preparation method of lithium-sulfur battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Get 5g of Ketjen black carbon particles, 3g of single-walled carbon nanotubes and 2g of reduced graphene oxide sheets in a beaker, add 500mL of absolute ethanol, 300mL of H 2 O, stir to disperse and intermittently sonicate (to prevent overheating).

[0046] (2) Add 20 mL of phosphoric acid to the dispersion in step (1), and place the entire reaction device in a 5° C. water bath to keep warm. Then continue to add 10mL of aniline solution into the beaker, and stir to mix.

[0047] (3) Put 15g ammonium persulfate in a beaker, add 500mL H 2 O stir well to dissolve. Then use a peristaltic pump to pump the ammonium sulfate solution into the beaker where the carbon powder was dispersed in step (2). Then, add 3L of 50% ethanol solution by volume fraction into the dispersed system, and keep stirring.

[0048] (4) Take 300mL of manganese chloride (MnCl) with a concentration of 0.25mol / L 2 ) solution in a sealable container, then add 5 mL of hydrogen peroxide (H 2 o 2 )...

Embodiment 2

[0060] On the basis of embodiment 1, except that the transition metal manganese oxide (MnOOH) in the step (4) and step (7) of the embodiment 1 is directly replaced with the nanometer zinc oxide (ZnO) purchased, all the other steps and conditions are the same as In the same manner as in Example 1, a cathode material for a lithium-sulfur battery based on catalytic transition metal oxide nanorods was prepared.

[0061] It can be seen from SEM that, unlike the catalytic transition metal oxide catalyzed lithium-sulfur battery cathode material prepared in Example 1, in the material prepared in Example 2, the existence of spherical nano-zinc oxide can be clearly observed, which exists as a catalyst , the presence of the catalyst can promote the kinetic process of the lithium-sulfur battery reaction, accelerate the conversion between polysulfides, thereby improving the utilization of active materials, slowing down the shuttle effect of polysulfides, and improving the overall performanc...

Embodiment 3

[0064] On the basis of Example 1, except that the standing temperature in step (4) of Example 1 was changed from 90°C to 5°C, the remaining steps and conditions were exactly the same as in Example 1, and a catalytic transition metal oxide based cathode materials for lithium-sulfur batteries.

[0065] It can be seen from SEM that in the prepared transition metal oxide catalyzed lithium-sulfur battery positive electrode material, the existence of spherical manganese oxide can be clearly observed, which exists as a skeleton and a catalyst in the material, and the presence of the catalyst can promote The kinetic process of the lithium-sulfur battery reaction accelerates the conversion between polysulfides, thereby improving the utilization of active materials, slowing down the shuttle effect of polysulfides, and improving the overall performance of lithium-sulfur batteries. In addition, the framework structure of the positive electrode material has comprehensive multi-dimensional ...

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Abstract

The invention relates to a lithium-sulfur battery positive electrode material based on catalytic transition metal oxide nanorods and a preparation method of the lithium-sulfur battery positive electrode material, and belongs to the technical field of battery materials. The high-specific-energy lithium-sulfur battery positive electrode material is composed of a multi-dimensional carbon skeleton, a transition metal oxide nanorod, elemental sulfur and a conductive polymer, wherein the catalytic metal oxide nanorod not only can be used as a carrier of an active substance, but also can be used for catalyzing mutual conversion among polysulfides and accelerating the reaction rate of the battery, so that the shuttle effect is slowed down and the rate capability of the battery is improved; meanwhile, the multi-dimensional carbon skeleton structure can ensure the high utilization rate of sulfur, and the conductive polymer coating layer can inhibit the volume change of the positive electrode material and the shuttle effect of polysulfide, so that the high specific energy and long cycle characteristics of the lithium-sulfur battery are realized. The method for preparing the lithium-sulfur positive electrode material is simple in process, low in cost and easy for large-scale production.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material based on catalytic transition metal oxide nanorods and a preparation method thereof, belonging to the technical field of battery materials. Background technique [0002] At present, the world is facing severe environmental problems. The use of fossil energy has caused a large amount of carbon dioxide to be emitted into the atmosphere, which has accelerated the rise of global temperature and led to frequent occurrence of extreme weather. Therefore, the development of clean, renewable and efficient energy materials has become our best choice. In the field of advanced energy technology, new secondary batteries are a key technical link in energy conversion and storage. The development of secondary batteries has a history of 150 years. From lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries to lithium-ion batteries, lithium-sulfur batteries, its development proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/42H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M4/624H01M10/4235H01M10/052H01M2004/028
Inventor 陈人杰张楠祥赵腾冯涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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