A kind of flexible heat-conducting film and preparation method based on functional group graphene reduction
A thermal conductive film, graphene technology, applied in electrical components, electrochemical generators, secondary batteries, etc., can solve problems such as shortening battery life, battery scrap, explosion, etc., to achieve the effect of excellent thermal conductivity
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Embodiment 1
[0022] Using an ultrasonic cell pulverizer, the graphene oxide was dispersed in ultrapure water at a concentration of 2 mg / ml, and the ultrasonic dispersion time was 3 hours. The dispersion liquid was centrifuged for 1 h, the speed of the centrifuge was 1000 r / min, the sediment at the bottom was removed, and the supernatant was taken. A cellulose acetate filter membrane with a pore size of 12 μm was used to filter the centrifuged dispersion liquid alternately on front and back sides, and the number of times of filtration was 20 times. Then, the filter membrane loaded with graphene oxide was dried under vacuum conditions at 80° C. for 5 h. Finally, the dried filter membrane was treated at 400° C. for 5 hours under the protection of argon atmosphere to obtain a graphene flexible thermally conductive film 1, as shown in figure 1 shown. Graphene flexible heat conduction film 1 can be used for heat dissipation of battery cells 2 in a battery pack composed of 18650 type batteries...
Embodiment 2
[0024] Using an ultrasonic cell pulverizer, the nitrogen-doped graphene was dispersed in DMF at a concentration of 5 mg / ml, and the ultrasonic dispersion time was 4 h. Centrifuge the dispersion for 3 hours at a speed of 2000 r / min to remove the bottom sediment and take the supernatant. A polypropylene filter membrane with a pore size of 14 μm was used to filter the centrifuged dispersion liquid alternately on front and back sides, and the number of times of filtration was 30 times. Then, the filter membrane loaded with nitrogen-doped graphene was dried at 90° C. under vacuum for 6 h. Finally, the dried filter membrane was treated at 200° C. for 6 hours under the protection of a nitrogen atmosphere to obtain a graphene flexible thermally conductive film 1, as shown in figure 1 shown. Graphene flexible heat conduction film 1 can be used for heat dissipation of battery cells 2 in a battery pack composed of 18650 type batteries, such as image 3 As shown, the graphene flexible...
Embodiment 3
[0026] Using an ultrasonic cell pulverizer, the graphene oxide was dispersed in THF at a concentration of 8 mg / ml, and the ultrasonic dispersion time was 3 h. Centrifuge the dispersion for 4 hours at a speed of 3000 r / min to remove the bottom sediment and take the supernatant. A PVDF polyvinylidene fluoride filter membrane with a pore size of 16 μm was used to filter the centrifuged dispersion liquid alternately on front and back sides, and the number of times of filtration was 35 times. Then, the filter membrane loaded with graphene oxide was dried at 80° C. under vacuum for 8 h. Finally, the dried filter membrane was treated at 400°C for 7h under the protection of argon atmosphere to obtain a graphene flexible thermally conductive film 1, as shown in figure 1 shown. Graphene flexible heat conduction film 1 can be used for heat dissipation of square battery cells 2, such as Figure 4 As shown, the graphene flexible heat conduction film 1 can be closely attached to the sur...
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