Method for improving breakdown strength and energy storage density of dielectric composite material
A technology of composite materials and breakdown strength, which is applied in the field of improving the breakdown strength and energy storage density of dielectric composite materials, can solve the problems of deterioration of electrical breakdown performance of composite films, improve interfacial compatibility, and improve dispersion controllability And the effect of stability and high energy storage density
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[0067] Example 1
[0068] BaTiO 3 Hydroxylation: Weigh 3g of dried BaTiO 3 Add 70ml of hydrogen peroxide to a three-necked round-bottom flask, and ultrasonically disperse for half an hour. The reaction system is magnetically stirred in an oil bath at 106°C and heated to reflux for 6 hours. After the reaction is completed, cool to room temperature and centrifuge with a low-speed centrifuge (3000r, 10min). After centrifugation and washing twice with deionized water, the obtained product was dried at 80°C for 12 hours. Grind to get BaTiO 3 -OH;
[0069] TC-2 surface coating modification: weigh 1g of BaTiO 3 -OH powder was placed in a three-necked round-bottomed flask, dissolved in 80ml isopropanol, stirred for 30min while ultrasonic to promote its dissolution, added dropwise 0.1ml TC-2 magnetic stirring and refluxed under 70℃ oil bath for 2h, after the reaction was cooled to The product was centrifuged at room temperature at low speed, washed once with deionized water, washed twice w...
Example Embodiment
[0071] Example 2
[0072] BaTiO 3 Hydroxylation: Weigh 3g of dried BaTiO 3 Add 70ml of hydrogen peroxide to a three-necked round-bottom flask, and ultrasonically disperse for half an hour. The reaction system is magnetically stirred in an oil bath at 106°C and heated to reflux for 6 hours. After the reaction is completed, cool to room temperature and centrifuge with a low-speed centrifuge (3000r, 10min). After centrifugation and washing twice with deionized water, the obtained product was dried at 80°C for 12 hours. Grind to get BaTiO 3 -OH;
[0073] TC-2 surface coating modification: weigh 1g of BaTiO 3 -OH powder was placed in a three-necked round-bottomed flask, dissolved in 80ml isopropanol, stirred for 30min while ultrasonic to promote its dissolution, added dropwise 0.1ml TC-2 magnetic stirring and refluxed under 70℃ oil bath for 2h, after the reaction was cooled to The product was centrifuged at room temperature at low speed, washed once with deionized water, washed twice w...
Example Embodiment
[0079] Example 3
[0080] Weigh 0.01204g of unmodified BT nanoparticles and add them to 4ml DMF and ultrasonically disperse them until the nanofillers form a stable suspension in the solvent; add 0.5g PVDF to the above suspension while stirring, and then place it at 30°C overnight Stir to dissolve completely. Stir evenly and cast on a dry and clean glass plate to form a film. Place the composite film cast by the solution in an oven and dry it at 60-80°C to completely volatilize the solvent. The composite film BT / PVDF with a filler content of 2 vol% was obtained.
[0081] The added amount of BT particles was changed to prepare BT-PVDF composite films with filling amounts of 2%, 4%, 6%, 8%, and 10% respectively.
[0082] Observe the composite film with scanning electron microscope, such as Figure 4 As shown in (a), it is found that the BT particles agglomerate seriously in the PVDF matrix. The electrical breakdown performance and energy storage density of the composite film are tes...
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