Preparation method for self-supporting porous electrode, and self-supporting porous electrode and application thereof
A porous electrode, self-supporting technology, applied in the direction of electrode manufacturing, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of hindered ion and electron transmission, difficult to make electrodes, poor capacity, etc., and achieve controllable electrode thickness , Improve energy density, wide application range
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[0052] Example 1
[0053] Dissolve 0.8g PVDF-HFP in 17g N-methylpyrrolidone (NMP), stir until completely dissolved, add 0.4g KB600, stir for 10min, add 2.8g water vapor activated KB600 carbon powder and sulfur compound (S / A-KB600), stir for 5 hours to make it a uniform slurry, adjust the scraper to 0μm, and repeatedly scrape and coat 3 times on a glass plate with grooves (groove depth: 300μm, diameter: 14mm), and then fill the grooves After being filled with the slurry, place the glass plate in the water. After the slurry disc is separated from the glass plate, after being quenched by liquid nitrogen, it is placed in a freeze dryer for 12 hours and dried overnight at 70℃. After weighing, 60 Vacuum drying at ℃ for 24h. Subsequent battery assembly and testing were the same as in Comparative Example 1.
[0054] The specific discharge capacity of the first turn at 0.1C rate is 1201mA h g -1 , The specific capacity remains at 900mA hg after 50 cycles -1 , The capacity retention rate ...
Example Embodiment
[0055] Example 2
[0056] Dissolve 0.8g PVDF-HFP in 17g N-methylpyrrolidone (NMP), stir until completely dissolved, add 0.4g MWCNTs (diameter: 8-15nm, length: 20-30μm), stir for 10min and then add 2.8gS / A -KB600, stir for 5h to make it a uniform slurry. Subsequent electrode preparation, battery assembly and testing are the same as in Example 1.
[0057] The discharge specific capacity of the first turn at 0.1C rate is 1199mA h g -1 , The specific capacity remains at 833mA hg after 50 cycles -1 , The capacity retention rate is 73.6%; when the rate is increased to 1C, the discharge specific capacity is 779mA h g -1 .
Example Embodiment
[0058] Example 3
[0059] Take 0.8g PAN and dissolve it in 17g N-methylpyrrolidone (NMP), stir until completely dissolved, add 0.4g KB600, stir for 10 minutes, add 2.8g S / A-KB600, stir for 5 hours, make it a uniform slurry. Subsequent electrode preparation, battery assembly and testing are the same as in Example 1.
[0060] The specific discharge capacity of the first turn at 0.1C rate is 1186mA h g -1 , The specific capacity remains at 1058mA hg after 50 cycles -1 , The capacity retention rate is 89.2%; when the rate is increased to 1C, the discharge specific capacity is 699mA h g -1 .
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