Sulfur-carbon composite positive electrode material and preparation method and application thereof

A composite material and electrode technology, which is applied in the field of preparation of sulfur/carbon composite positive electrode materials, can solve problems such as limited application and difficulty in breaking through, and achieve the effect of improving practical effects, good adaptability, and simple and environmentally friendly production methods

Pending Publication Date: 2020-12-01
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the number of unsaturated nitrogen atoms in the currently emerging organic carbon materials has been difficult to break through (the atomic mass fraction is about 1%-10%), which limits its application in Li-S batteries to a certain extent.

Method used

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  • Sulfur-carbon composite positive electrode material and preparation method and application thereof
  • Sulfur-carbon composite positive electrode material and preparation method and application thereof
  • Sulfur-carbon composite positive electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Measure 30mL of formamide, add it to a 50mL polytetrafluoroethylene liner, seal it, put it into a reactor, and react at 180° for 24 hours. After cooling to room temperature, wash, centrifuge, and dry several times. The polymer material and sublimed sulfur were put into a ball mill jar at a mass ratio of 1:1, and 15 mL of N,N-dimethylformamide was added to ball mill at room temperature for 4 hours, and vacuum dried at 70°C. A cathode material with a sulfur content of 50% was obtained. According to the positive electrode material: conductive carbon black: binder (LA132) = 7:2:1 mixing slurry.

Embodiment 2

[0055] Add 1g of zinc chloride to 30mL of formamide, disperse evenly by ultrasonic, add to 50mL of polytetrafluoroethylene liner, seal it and put it into a reaction kettle, and react at 180° for 24 hours. After cooling to room temperature, wash, centrifuge, and dry several times. The polymer material and the sublimed sulfur were put into a ball mill jar at a mass ratio of 3:7, and 15 mL of N,N-dimethylformamide was added for ball milling at room temperature for 4 hours, followed by vacuum drying at 70°C. A positive electrode material with a sulfur content of 70% was obtained. According to the positive electrode material: conductive carbon black: binder (LA132) = 7:2:1 mixing slurry.

Embodiment 3

[0057] The operation steps are the same as in Example 2, except that 1.0 g of zinc chloride in the raw material is replaced by 1.0 g of molybdenum chloride.

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Abstract

The invention discloses a preparation method of a sulfur-carbon composite positive electrode material, which comprises the following steps: 1) putting formamide or a formamide solution dissolved witha metal salt into a high-pressure reaction kettle, and reacting at a certain temperature to obtain a black powdery product, 2) purifying the black powdery product to obtain formamide derived carbon, 3) mixing the formamide derived carbon with sulfur powder according to a certain mass ratio to obtain a mixture, mixing the mixture with a certain amount of polar solvent, and grinding at a certain temperature to obtain a ground product, and 4) performing vacuum drying on the ground product, and removing the solvent to obtain the formamide derived carbon / sulfur composite material. The invention also provides an electrode prepared from the composite material and a lithium-sulfur battery. The composite material provided by the invention strongly adsorbs lithium polysulfide in the charging and discharging process of the lithium-sulfur battery, thereby effectively avoiding the influence of a shuttle effect on the battery.

Description

Technical field: [0001] The invention relates to the technical field of battery materials, in particular to a preparation method and application of a sulfur / carbon composite cathode material for a lithium-sulfur battery. Background technique: [0002] Lithium-sulfur batteries are promising electrochemical energy storage systems and are considered to be one of the ideal choices for next-generation high-energy-density battery systems. For example, the theoretical specific capacity and specific energy of lithium-sulfur (Li-S) battery are as high as 1675mAh / g and 2600Wh / kg respectively, which is a very promising lithium battery. The aluminum-sulfur (Al-S) battery composed of aluminum alloy or aluminum foil as the negative electrode has a high specific capacity of 1672mAh / g, and the price of raw materials is low. In addition, sulfur reserves are relatively abundant, the price is low, and the environment is friendly. [0003] However, the practical application of Li-S batteries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B17/02H01M4/139H01M4/38H01M4/62H01M10/052H01M10/058
CPCC01B17/0243C01B32/05H01M4/139H01M4/38H01M4/62H01M4/625H01M4/628H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 张国新李宗阁潘浩邵林
Owner SHANDONG UNIV OF SCI & TECH
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