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
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[0036] Example 1
[0037] Dissolve 1g PVDF-HFP in 17g N-methylpyrrolidone (NMP), stir for 1h, add 2gS / A-KB600, stir for 5h, adjust the scraper to 300μm, scrape the aluminum film to form a film, and quickly immerse it in water , Take it out after 10min, dry at 50℃ overnight. Subsequent electrode preparation and battery assembly were the same as the comparative example.
[0038] The first discharge specific capacity is 1308mA h g -1 , The capacity remains 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 .
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[0039] Example 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 , Get a mixed solution. Subsequent electrode preparation, drying, and battery assembly test procedures are the same as in Example 1.
[0041] The first discharge specific capacity is 1338mA h g -1 , The capacity remains 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] by figure 1 It can be seen that the electrode of Example 1 is relatively flat 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 adhesion between the material and the ...
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