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Gel electrolyte porous electrode for lithium-sulfur battery and preparation and application of gel electrolyte porous electrode

A gel electrolyte and porous electrode technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of inability to stack and dry, high degree of binder crystallization, and energy consumption. Achieve good ion transmission ability, improve rate performance, and improve the effect of bonding performance

Active Publication Date: 2017-03-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional Li-S battery positive electrode preparation process, it is necessary to use a high-boiling organic solvent to prepare a slurry. Therefore, a higher temperature and a longer time are required to dry the electrode, which consumes a lot of energy and increases the Li- Preparation cost of positive electrode of S battery
Secondly, most of the organic solvents with high boiling points are poisonous, and their discharge into the air will cause serious environmental pollution and endanger people's health
Thirdly, during the drying process, the electrode is still not finalized, and it cannot be stacked and dried. It occupies a large area and is easy to bump, resulting in the loss of electrode materials.
Finally, the traditional drying method has a high degree of crystallization of the binder, poor adhesion to electrode materials with high specific surface area and high pore volume, serious cracks in the prepared electrode, and poor sulfur resistance performance.
All the above problems will seriously hinder the further development of Li-S batteries.

Method used

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  • Gel electrolyte porous electrode for lithium-sulfur battery and preparation and application of gel electrolyte porous electrode
  • Gel electrolyte porous electrode for lithium-sulfur battery and preparation and application of gel electrolyte porous electrode
  • Gel electrolyte porous electrode for lithium-sulfur battery and preparation and application of gel electrolyte porous electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve 1g of PVDF-HFP in 17g of N-methylpyrrolidone (NMP), stir for 1h, add 2g of S / A-KB600, stir for 5h, adjust the scraper to 300μm, scrape and form a film on the aluminum film, and quickly immerse in water , Take it out after 10 minutes, and dry overnight at 50°C. Subsequent electrode preparation and battery assembly are the same as the comparative example.

[0038]The specific capacity of the first cycle discharge is 1308mA h g -1 , the capacity maintained at 907mA h g after 100 cycles -1 , the capacity retention rate is 69.3%; when the rate is increased to 1C, the discharge specific capacity is 817mA h g -1 .

Embodiment 2

[0040] Weigh 0.7g polyacrylonitrile (PAN, Mw=150000), and 0.3g polyethylene glycol (PEG, Mw=6000), stir and dissolve in 17g DMF solution, add 2g S / A-KB600, stir for 5h , to obtain a mixture. Subsequent electrode preparation, drying, and battery assembly test steps are the same as in Example 1.

[0041] The specific capacity of the first cycle discharge is 1338mA h g -1 , the capacity maintained at 1034mA h g after 100 cycles -1 , the capacity retention rate is 77.3%; when the rate is increased to 1C, the discharge specific capacity is 748mA h g -1 .

[0042] Depend on figure 1 It can be seen that the electrode of Example 1 is relatively smooth as a whole, and no obvious defects are seen, while the comparative example is severely cracked, and the carbon material on the edge has fallen off, indicating that the gel electrolyte porous electrode prepared by the immersion phase inversion method is better than the electrode prepared by the traditional method. The bond between th...

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Abstract

The invention relates to a gel electrolyte porous electrode for a lithium-sulfur battery and preparation and application of the gel electrolyte porous electrode. One or more than two organic polymer resins are mixed with a carbon / sulfur compound to prepare the gel electrolyte porous electrode through an immersion phase inversion method; and the mass of the organic polymer resins accounts for 3wt%-60wt% of total mass of the electrode. The prepared gel electrolyte porous electrode has the advantages of good ion transport capacity, adjustable pore size, simple process, good cohesiveness and capability of being friendly to environment. The gel electrolyte porous electrode is taken as a positive electrode material for the lithium-sulfur battery, so that the battery has good overall performance and a good application prospect.

Description

technical field [0001] The invention relates to a gel electrolyte porous electrode for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Among commercialized secondary batteries, lithium-ion batteries are currently the secondary batteries with the highest energy density, but the theoretical specific capacity of lithium-ion batteries based on the "deintercalation" theory is currently less than 300mA h g -1 , the actual energy density is less than 200Wh kg -1 , It is far from meeting people's demand for 500km battery life of electric vehicles. Lithium-sulfur battery, as a new electrochemical energy storage secondary battery, is different from the traditional lithium ion "deintercalation" material. During the discharge process, sulfur and metal lithium undergo a two-electron reaction, which can release a high specific capacity. (1675mAh g -1 ), the theoretical specific energy is also as high as 2600Wh kg -1 , At the same time, the acti...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M4/13H01M4/139C08J9/28C08J9/40
CPCC08J9/28C08J9/40H01M4/13H01M4/139H01M10/052Y02E60/10
Inventor 张洪章张华民杨晓飞李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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