Oxide nanowire-MOF derivative/S composite positive electrode material and preparation method therefor

A composite positive electrode material and composite material technology, applied in the field of oxide nanowire-MOF derivative/S composite positive electrode material and its preparation, can solve the problems of accelerating the commercialization of lithium-sulfur batteries, unstable cycle performance, poor conductivity, etc. , to achieve the effect of meeting the needs of industrial production, unique shape, and improving conductivity

Inactive Publication Date: 2017-11-03
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In view of the existing lithium-sulfur batteries, when sulfur is used alone as a positive electrode material, the electrical conductivity is poor, the cycle performance is not stable, etc., the present invention provides an oxide nanowire-MOF derivative / S composite positive electrode material and The preparation method thereof belongs to the field of lithium-sulfur battery cathode materials and preparation methods thereof
The oxide nanowire-MOF derivative / S composite positive electrode material solves some problems such as poor conductivity when sulfur is used alone as the positive electrode of lithium-sulfur batteries. The carbonized product has a large specific surface area and high conductivity. Better, it is very suitable for sulfur fixation; in addition, the oxide nanowire-MOF derivative / S composite cathode material also has good cycle stability, relatively high capacity, simple preparation, and easy access to raw materials, which is beneficial to There are many advantages such as accelerating the commercialization of lithium-sulfur batteries, which have great potential value

Method used

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  • Oxide nanowire-MOF derivative/S composite positive electrode material and preparation method therefor
  • Oxide nanowire-MOF derivative/S composite positive electrode material and preparation method therefor
  • Oxide nanowire-MOF derivative/S composite positive electrode material and preparation method therefor

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Experimental program
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Effect test

Embodiment 1

[0030] In step 1, first dissolve 0.04g of manganese oxide nanowires in 20mL of methanol solvent, and disperse evenly by ultrasonic; at the same time, take 0.2g of 2-methylimidazole and dissolve them in 10mL of solvent, and disperse evenly; Add 0.1g of PVP, and ultrasonically disperse evenly; then, add 0.1g of cobalt nitrate hexahydrate to the solution with PVP, and ultrasonically disperse evenly; finally, mix the methanol solution of 2-methylimidazole with the solution containing cobalt nitrate hexahydrate, seal Let the reaction stand for at least 20 hours, wash the reaction product with methanol three times, and dry at 60°C to obtain ZIF-67-MnO 2 NWs are materials with a unique serial structure.

[0031] In the second step, the prepared ZIF-67-MnO 2 NWs were put into a tube furnace for carbonization, held at 300 °C for 3 h in an argon atmosphere, and the heating rate was 1 °C / min. Take it out of the tube furnace when it drops to room temperature, and you can get to the MnO ...

Embodiment 2

[0033] In step 1, first dissolve 0.04g of manganese oxide nanowires in 20mL of methanol solvent, and disperse evenly by ultrasonic; at the same time, take 0.2g of 2-methylimidazole and dissolve them in 10mL of solvent, and disperse evenly; Add 0.15g SDS, ultrasonically disperse evenly; then, add 0.2g zinc nitrate hexahydrate to the solution added with SDS, ultrasonically disperse evenly; finally, mix the methanol solution of 2-methylimidazole with the solution containing zinc nitrate hexahydrate, seal Let the reaction stand for at least 20 hours, wash the reaction product with methanol three times, and dry at 60°C to obtain ZIF-8-MnO 2 NWs are materials with a unique serial structure.

[0034] In the second step, the prepared ZIF-8-MnO 2 NWs were put into a tube furnace for carbonization, held at 600 °C for 3 h in an argon atmosphere, and the heating rate was 1 °C / min. Take it out of the tube furnace when it drops to room temperature, and you can get the material MnO NWs-C-C...

Embodiment 3

[0036]Step 1, firstly dissolve 0.05g zinc oxide nanowires in 50mL N,N-dimethylformamide solvent and disperse uniformly by ultrasonic; then add 0.2g PVA into the solution and disperse uniformly by ultrasonic; then 0.3g hexahydrate Add cobalt nitrate and 0.3g benzimidazole into the solution and ultrasonically disperse evenly; finally, transfer the evenly dispersed solution into a 100mL reactor for hydrothermal reaction at 120°C for three hours, wash the obtained product with ethanol three times, and dry at 60°C Then ZIF-7-ZnO NWs, a material with a unique serial structure, can be obtained.

[0037] In the second step, the prepared ZIF-7-ZnO NWs were put into a tube furnace for carbonization, and kept at 500°C for 3h under an argon atmosphere, with a heating rate of 1°C / min. Take it out of the tube furnace when it drops to room temperature, and you can get the material ZnO NWs-C-Co, then mix the material with S at a weight ratio of 1:3, use a reactor to fix sulfur, and keep it wa...

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Abstract

The invention discloses an oxide nanowire-MOF derivative / S composite positive electrode material and a preparation method therefor, and belongs to the fields of a lithium-sulfur battery positive electrode material and a preparation method therefor. According to the positive electrode material, the effects of PVP, SDS, PVA, NPAM and other surfactants are utilized; next, by taking metal oxide nanowires as the substrate, imidazole, an organic solvent and metal salt are added, and then, standing and hydrothermal and solvothermal methods are preformed to prepare an oxide nanowire / ZIF-system MOFs tomatoes-on-sticks-shaped composite material to be used as a precursor; and then the precursor is subjected to carbonization treatment, and next, sulfur fixation is carried out by the carbonized product so as to obtain the oxide nanowire-MOF derivative / S composite positive electrode material. The carbonized product has relatively large specific surface area and relatively high conductivity, so that the carbonized product is very suitable for sulfur fixation; and in addition, the composite positive electrode material and the preparation method therefor are relatively high in cycling stability and capacity, and have simple preparation and easily available raw materials, so that the advantages of accelerating commercialization of the lithium-sulfur battery and the like, as well as quite high potential value are achieved.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery positive electrode materials and preparation methods thereof, and specifically relates to an oxide nanowire-MOF derivative / S composite positive electrode material and a preparation method thereof. Background technique [0002] In recent years, lithium-sulfur batteries have attracted the attention of many researchers because of their excellent energy density and power density. As we all know, elemental sulfur has many excellent natural properties, such as relatively low price, abundant reserves, and environmental friendliness. However, sulfur has poor electrical conductivity and cannot be used alone as a positive electrode material, which restricts the development of lithium-sulfur batteries and makes it impossible for large-scale commercial use. In order to improve the cycle performance of lithium-sulfur batteries, we usually use conductive materials to coat sulfur to improve the conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/60H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/48H01M4/60H01M10/0525Y02E60/10
Inventor 马延文贡振黄镇东柏玲
Owner NANJING UNIV OF POSTS & TELECOMM
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