Sodium-sulfur battery positive electrode material and preparation method therefor

A positive electrode material, sodium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve battery component sealing technology, high technical requirements for anti-corrosion electrode materials, unable to adapt to the requirements of portability, sodium-sulfur battery Capacitance decline and other problems, to achieve good charge and discharge stability, inhibition of dissolution, the effect of a large reaction interface

Active Publication Date: 2017-11-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, my country is rich in sodium resources, so the research on sodium-sulfur batteries has attracted much attention in recent years. The sodium-sulfur battery was originally invented by the Ford Company of the United States in 1966, but the normal operation of the entire battery needs to be maintained at a temperature of 300-350 ° C. The sealing technology of battery components and the technical requirements of corrosion-resistant electrode materials are relatively high. At the same time, it needs an additional heat source during use, which cannot meet the requirements of portability in modern society. Therefore, there is an urgent need to develop sodium-sulfur batteries that can be used at room temperature
[0004] However, during the cycle of the battery, sulfur will form polysulfides with the negative electrode sodium. Such compounds can be dissolved in the electrolyte, causing the capacity fading of the sodium-sulfur battery to decline sharply, resulting in extremely poor cycle performance of the battery.

Method used

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  • Sodium-sulfur battery positive electrode material and preparation method therefor
  • Sodium-sulfur battery positive electrode material and preparation method therefor
  • Sodium-sulfur battery positive electrode material and preparation method therefor

Examples

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Effect test

Embodiment 1

[0036] 1) Add 1.164 g of cobalt nitrate hexahydrate into 50 mL of methanol solution, and stir at room temperature and normal pressure for 10 minutes until cobalt nitrate hexahydrate is completely dissolved in the anhydrous methanol solution to obtain solution A;

[0037] 2) Add 1.314g of 2-methylimidazole into 50mL of methanol solution, stir until completely dissolved to obtain solution B, after that, pour solution A into solution B, after it is completely mixed, stop stirring, and then dissolve the solution Place it in a ventilated place and let it stand for 24 hours;

[0038] 3) The product obtained in the previous step is centrifuged and washed with anhydrous methanol, and dried to obtain the ZIF67 precursor for subsequent use;

[0039] 4) The obtained precursor was heated up to 700°C at 5°C / min under nitrogen atmosphere, kept at this temperature for 6h, cooled to room temperature and taken out;

[0040] 5) Mix the obtained material with sulfur at a ratio of 1:3, and after...

Embodiment 2

[0047] 1) Add 2.328 g of cobalt nitrate hexahydrate into 50 mL of methanol solution, and stir at room temperature and normal pressure for 10 minutes until cobalt nitrate hexahydrate is completely dissolved in the anhydrous methanol solution to obtain solution A;

[0048] 2) Add 2.628g of 2-methylimidazole into 50mL of methanol solution, stir until completely dissolved to obtain solution B, after that, pour solution A into solution B, after it is completely mixed, stop stirring, and then dissolve the solution Place it in a ventilated place and let it stand for 24 hours;

[0049] 3) The product obtained in the previous step is centrifuged and washed with anhydrous methanol, and dried for subsequent use;

[0050] 4) The obtained precursor was heated up to 700°C at 5°C / min under nitrogen atmosphere, kept at this temperature for 6h, cooled to room temperature and taken out;

[0051] 5) The obtained material was mixed with sulfur at a ratio of 1:1, and after manual grinding for 20 ...

Embodiment 3

[0054] 1) Add 4.656 g of cobalt nitrate hexahydrate into 50 mL of methanol solution, and stir at room temperature and normal pressure for 10 minutes until cobalt nitrate hexahydrate is completely dissolved in the anhydrous methanol solution to obtain solution A;

[0055] 2) Add 5.256g of 2-methylimidazole into 50mL methanol solution, stir until completely dissolved to obtain solution B, after that, pour solution A into solution B, after it is completely mixed, then place the solution in a ventilated Place, stand still for 24h;

[0056] 3) The product obtained in the previous step is centrifuged and washed with anhydrous methanol, and dried for subsequent use;

[0057] 4) The obtained precursor was heated up to 700°C at 5°C / min under nitrogen atmosphere, kept at this temperature for 6h, cooled to room temperature and taken out;

[0058] 5) The obtained material was mixed with sulfur at a ratio of 1:2, and after manual grinding for 20 minutes, it was heat-treated at 155°C for 8...

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Abstract

The invention relates to a sodium-sulfur battery positive electrode material and a preparation method therefor. The sodium-sulfur battery positive electrode material is compounded by a metal organic framework material and sublimed sulfur; the mixing mass ratio of the metal organic framework material to sublimed sulfur is 1:1 to 1:4, and the loading capacity of sulfur is 60-75%; the preparation method comprises the following steps of a), performing heat treatment on the metal organic framework material to obtain a graphitized porous material; and b) performing mixing and grinding on the graphitized porous material obtained in the step a) and sublimed sulfur, and then performing heat treatment to permeate sulfur into the interior of the porous material to obtain the sodium-sulfur battery positive electrode material. Compared with the prior art, mesopores are loaded with the majority of active materials, so that diffusion of polysulfide ions can be suppressed, and dissolving-out of polysulfide in a circulation process can be effectively limited; meanwhile, the positive electrode material is large in the specific surface area, so that a relatively large reaction interface can be provided, and a certain effect of sulfur and polysulfide adsorption is also played; and the preparation method is a one-step method, so that the technological steps are simple.

Description

technical field [0001] The invention belongs to the field of new energy electrode materials, and particularly designs a sodium-sulfur cathode material based on MOFs materials and a preparation method thereof. Background technique [0002] Since 1991, carbon materials have been creatively applied in the field of lithium-ion batteries, and they have been widely used in portable electronic products such as mobile phones, laptop computers, and digital cameras. However, in modern life, with the continuous improvement of people's requirements for battery life, traditional lithium-ion batteries can no longer meet the needs of the current stage. Therefore, the development of secondary batteries with high energy density, long cycle life, high safety, environmental protection and low cost is of great significance in the field of new energy. [0003] The sulfur cathode has a theoretical specific capacity of 1675mAh / g and an energy density of 2600Wh / Kg, which is ten times the theoretic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/39
CPCH01M4/362H01M4/38H01M4/628H01M10/3909Y02E60/10
Inventor 麦立强韩康杨晨王选朋
Owner WUHAN UNIV OF TECH
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