High-energy-density supercapacitor
A high-energy density, supercapacitor technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of low energy density of supercapacitors, achieve good economic and social effects, overcome defects in conductivity, and improve stability. Effect
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Embodiment 1
[0025] Supercapacitor positive electrode preparation: Take 2 kg of carbon nanotubes and activated carbon materials with a weight ratio of 1:9, ball mill and mix them in a ball mill, and then transfer them to a mixer. Under slow stirring, 500 mL of PVDF (10 wt%) in NMP was added. After the mixture is stirred evenly, it is coated on the surface of the aluminum foil pole piece. After rolling, the coating thickness is controlled at 50~200μm. The coated pole pieces were baked under vacuum for 24 hours and then transferred to a drying room. The coated pole piece is film-cut in a mold, and the slice size is 60mm×140mm. The structure of the positive electrode is as figure 1 As shown, activated carbon with high surface area needs high surface area to provide an electric double layer, and carbon nanomaterials including nanotubes and nanofibers provide electron transport channels, and provide structural support and good liquid absorption performance for activated carbon particles.
Embodiment 2
[0027] Amorphous titanium dioxide (TiO 2 ) and lithium carbonate (lithium:titanium = 0.84 (molar ratio)) were mixed in a ball mill for 2 hours. After mixing was complete, the mixture was transferred to a tube furnace and heated to 900 °C for 12 h. Lithium titanate was pulverized in a ball mill until the particle size was below 1 μm.
[0028] Stir and mix the lithium titanate particles and carbon nanotubes, slowly add the NMP solution of PVDF (10wt%) under stirring, and continue stirring until a uniform slurry is formed, wherein the weight ratio of lithium titanate, PVDF and carbon nanotubes It is 7.5:1.5:1. After the slurry was left for 2 hours, it was coated on the surface of the aluminum foil for later use. After rolling, the thickness of the material is 20~50μm. The coated pole pieces were baked under vacuum for 24 hours and then transferred to a drying room. The coated pole piece is film-cut in a mold, and the slice size is 50 mm×120 mm. The structure of the negative...
Embodiment 3
[0030] The positive pole piece (prepared in Example 1), the separator (conventional product), and the negative pole piece (prepared in Example 2) were stacked together and packaged in an aluminum-plastic film case. After the three sides of the capacitor are heat-sealed, the fluorinated ethylene carbonate electrolyte containing 1 mole of 6-fluorolithium phosphate is injected in an anhydrous and oxygen-free environment, and the aluminum-plastic film case is packaged and formed. After packaging, the capacitor battery was aged at 45°C for 72h.
[0031] After the assembly is completed, the capacitor is charged and discharged under constant temperature conditions, and the capacitor is discharged after the charging voltage reaches 3.3V. The result is as image 3 As shown, the capacity of the battery remains above 95% of the initial capacity after 10,000 cycles.
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