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Sulfur reduction reaction catalytic material as well as preparation method and application thereof

A catalytic material and reaction technology, applied in carbon preparation/purification, electrochemical generator, secondary battery repair/maintenance, etc., can solve problems such as poor battery rate performance, improve electrode rate characteristics, and broad application space , the effect of improving cycle stability

Inactive Publication Date: 2021-06-04
GUANGDONG POLYTECHNIC NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a sulfur reduction reaction catalytic material to solve the problem of poor battery rate performance in the existing lithium-sulfur battery cathode materials proposed in the above background technology when used to prepare lithium-sulfur batteries

Method used

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  • Sulfur reduction reaction catalytic material as well as preparation method and application thereof
  • Sulfur reduction reaction catalytic material as well as preparation method and application thereof
  • Sulfur reduction reaction catalytic material as well as preparation method and application thereof

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preparation example Construction

[0031] As another preferred embodiment of the present invention, the preparation method of the nano-metal oxide comprises the following steps:

[0032] The orthosilicate compound is mixed with the first solution, and ammonia water is added to react, and the precipitate is collected, washed and dried to obtain the nanometer metal oxide; wherein, the first solution is water and / or alcohol.

[0033] As another preferred embodiment of the present invention, in the preparation method of the nanometer metal oxide, the volume ratio of the orthosilicate compound to the first solution is 1:20-50.

[0034] Preferably, the volume ratio of the orthosilicate compound to the first solution is 1:30.

[0035] As another preferred embodiment of the present invention, in the preparation method of the nanometer metal oxide, the drying is at 40°C-90°C for 6-12 hours.

[0036] Preferably, the drying is performed in a drying oven at 60° C. for 10 hours.

[0037] As another preferred embodiment of...

Embodiment 1

[0071] A method for preparing a catalytic material for sulfur reduction reaction, comprising the following steps:

[0072] Step 1: Synthesis of Nanoscale Metal Oxide Templates

[0073] (1) Take the orthosilicate compound and the first solution according to the volume ratio of the orthosilicate compound (specifically, orthosilicate acetate) and the first solution at a ratio of 1:20, and uniformly mix under magnetic stirring Mix to obtain a mixed solution; wherein, the first solution is alcohol;

[0074] (2) Measure the same volume of saturated ammonia water as the orthosilicate compound and add it dropwise to the above mixed solution, and react for 5 hours under magnetic stirring;

[0075] (3) After the reaction, the precipitate was collected by centrifugation, washed three times with alcohol, and finally the obtained white product was dried in a drying oven at 50°C for 8 hours to obtain nano-metal oxide as a template.

[0076] Step 2: Synthesis of three-dimensional porous ca...

Embodiment 2

[0083] A method for preparing a catalytic material for sulfur reduction reaction, comprising the following steps:

[0084] Step 1: Synthesis of Nanoscale Metal Oxide Templates

[0085] (1) Take the orthosilicate compound and the first solution according to the volume ratio of the orthosilicate compound (specifically tetraethyl orthosilicate) and the first solution at a ratio of 1:45, and uniformly Mix to obtain a mixed solution; wherein, the first solution is deionized water;

[0086] (2) Measure the same volume of saturated ammonia water as the orthosilicate compound and add it dropwise to the above mixed solution, and react for 4 hours under the action of ultrasound;

[0087] (3) After the reaction, the precipitate was collected by centrifugation, washed 5 times with deionized water, and finally the obtained white product was dried in a drying oven at 80°C for 6 hours to obtain nano-metal oxide as a template.

[0088] Step 2: Synthesis of three-dimensional porous carbon-supp...

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Abstract

The invention relates to the field of electric energy storage systems, and particularly discloses a sulfur reduction reaction catalytic material as well as a preparation method and application thereof. The sulfur reduction reaction catalytic material is obtained by taking nano metal oxide as a template, adding cobalt nitrate hexahydrate, methyl alcohol, water and 2-methylimidazole and then conducting heat preservation, cooling, etching and drying, and rapid conversion of the polysulfide can be accelerated. The sulfur reduction reaction catalytic material can be used as an additive material of a sulfur electrode of a lithium-sulfur battery, so that the cycling stability and the electrode rate characteristic of the lithium-sulfur battery can be obviously improved, the defect that a sulfur positive electrode cannot be charged and discharged at high current is overcome, the problem that the rate capability of the battery is poor when an existing lithium-sulfur battery positive electrode material is used for preparing the lithium-sulfur battery is solved, and a wide market prospect is achieved.

Description

technical field [0001] The invention relates to the field of electric energy storage systems, in particular to a catalytic material for sulfur reduction reaction and its preparation method and application. Background technique [0002] As one of the three major parts of electric vehicles, automotive power batteries have an extremely important impact on the performance of electric vehicles. At present, the battery energy density of common automotive power batteries cannot meet the actual needs. For example, the new energy vehicle power system represented by lithium-ion batteries, because the actual specific energy density of lithium-ion batteries is close to the theoretical specific energy density of the electrode material. , so it still cannot meet the needs of electric vehicles with long cruising range; secondly, with the rapid development of intelligent electronic products, the demand for battery energy density is also getting higher and higher. The traditional ternary mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M10/052H01M10/42
CPCC01B32/05H01M10/052H01M10/4235Y02E60/10
Inventor 曾帅波郭颖华徐伟高群叶林鸿屈慕超林成伍强
Owner GUANGDONG POLYTECHNIC NORMAL UNIV
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