Preparation of Al2O3/TiO2 Composite film with High Specific Capacitance by Surface Self-assembly Method

doi:10.15541/jim20170260

Abstract

Abstract:

For anodized aluminum, the enhancement of the specific capacitance foils by increasing dielectric constant is one of the most common methods to meet the requirements of miniaturization and lightweight of aluminum electrolytic capacitors. In this study, surface self-assembly method was used to introduce sulfonic acid group to graft the surface of aluminum foil for changing its electrical properties. Electrostatic repulsion between surface of aluminum foil and colloidal particles of titanium dioxide was changed to electrostatic forces due to the existence of sulfonic acid group, which dramatically enhanced the deposition of titanium dioxide on the surface of the aluminum foil. After heat treatment and anodic oxidation of aluminum foil, the Al₂O₃/TiO₂compounds with high dielectric constant on the surface of aluminum foil were prepared successfully. Comparing with those without TiO₂coating, the content of Ti on the surface of anodized aluminum foil prepared by surface self-assembly method increased by 30 times while the specific capacitance of anodized aluminum foil was enhanced by 44.26% at the withstanding voltage of 400 V. Therefore, anodized aluminum foil with a high specific capacitance prepared by above method exhibits great potential in commercial application of aluminum electrolytic capacitor in the future.

Key words: surface self-assembly method, surface charge, Al₂O₃/TiO₂ composite film, aluminum electrolytic capacitor

CLC Number:

TQ174

WANG Jing-Ping, CHENG Fang-Yuan, DU Xian-Feng, XU You-Long. Preparation of Al₂O₃/TiO₂ Composite film with High Specific Capacitance by Surface Self-assembly Method[J]. Journal of Inorganic Materials, 2018, 33(6): 617-622.

Figures/Tables 7

Fig. 1 Schematic diagram of preparation process of samples

Fig. 2 Surface and cross section SEM images of aluminum foil in different processing stages

Table 1 Contact angle photos of different processing stages of aluminum foil

Specimen	S1	S2	S3	S4	S5
Contact angle	9.33°	125.53°	5.65°	42.92°	21.92°

Table 2 Zeta potentials of aluminum foil surfaces on different processing stages

Specimen	S1	S2	S3	S4	S5
Zeta potential/mV	+75.25	+97.97	-55.91	+37.24	+2.68

Fig. 3 EDAX patterns of different processing stages of aluminum foilS1, S2, S3, S4, S5, and S5-a are the surface EDAX results while S5-b is S5 cross section results

Fig. 4 XRD patterns of sample S0 and S5

Table 3 Capacitor characteristic parameters of anodic aluminum foils coated with or without TiO2

Specimens	C/ (nF•cm^-2)	V/V	CV/ (nF•V•cm^-2)	ΔC/%	ΔCV/%
S0	29.46	408	12019.68	-	-
S6	32.85	402	13205.70	11.51	9.87
S5	42.50	405	17212.50	44.26	43.20

References 15

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Preparation of Al₂O₃/TiO₂ Composite film with High Specific Capacitance by Surface Self-assembly Method

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