Surface Modification of Al Foils for Aluminum Electrolytic Capacitor

Abstract

Miniaturization and light weight of aluminum electrolytic capacitor can be achieved via the enhancement in the specific capacitance of anodized aluminum foils resulted from the introduction of compounds with high permittivity into dielectric layer. However, the electrostatic repulsion between the compounds and aluminum substrates hinders this introduction of the compounds, leading to a limited improvement in the specific capacitance. In this work, a novel strategy has been developed to promote the deposition of TiO2 on the surface of aluminum foils by surface modification with polyvinyl alcohol, which sharply decreases the electrostatic repulsion and dramatically increases the mass of deposited TiO2. The evolution of composition and morphology during the process are studied and the capacitor performance of aluminum foils with various treatments is investigated. Interestingly, after surface modification, a specific capacitance of 131.5 µF cm−2 under the withstanding voltage of 21.2 V is obtained, and there is about 60% enhancement in the specific capacitance compared with those without TiO2, and about 30% enhancement compared with those without surface modification, respectively. The specific capacitance obtained is the highest one for aluminum electrolytic capacitor reported to date. These outstanding performances exhibit great potential of this strategy for commercial application on aluminum electrolytic capacitor.

Self-supporting electrodes of lithium aluminium oxide–carbon nanocomposites synthesized from dicarboxylate-intercalated layered double hydroxide for supercapacitors

“…S7(b)†). We suggest that Al/S-LDH is a promising candidate for application in aluminium electrolytic capacitors due to simple control of the nanostructure and superior dielectric constant ( ε ); the values are 7–10 for aluminium oxide, 39 and 8.4–9.3 for LiAl 5 O 8 . 40 The measured C s values of Al/S-LDH electrode were 14 μF, 10 μF, 9.8 μF, and 9.2 μF at sweep rates of 100 mV s −1 , 300 mV s −1 , 500 mV s −1 , and 1000 mV s −1 , respectively, in the potential range from −0.5 to 0.7 V, (Fig.…”

Self-supporting electrodes of lithium aluminium oxide–carbon nanocomposites synthesized from dicarboxylate-intercalated layered double hydroxide for supercapacitors

“…S7(b)†). We suggest that Al/S-LDH is a promising candidate for application in aluminium electrolytic capacitors due to simple control of the nanostructure and superior dielectric constant ( ε ); the values are 7–10 for aluminium oxide, 39 and 8.4–9.3 for LiAl 5 O 8 . 40 The measured C s values of Al/S-LDH electrode were 14 μF, 10 μF, 9.8 μF, and 9.2 μF at sweep rates of 100 mV s −1 , 300 mV s −1 , 500 mV s −1 , and 1000 mV s −1 , respectively, in the potential range from −0.5 to 0.7 V, (Fig.…”

Electrode Surface‐Modified Strategy for Improving the Voltage of Aqueous Supercapacitors

“…Figure S7d, Supporting Information, demonstrates the H 3 PO 4 treatment strategy, which can form a passivation layer on the surface of the full electrode to inhibit the decomposition of water. [ 38 ] The SEM and energy‐dispersive spectroscopy (EDS) of pristine VACNT are shown in Figure S8, Supporting Information. Figure S9, Supporting Information, shows the morphology and element of Al 2 O 3 ‐treated electrodes.…”

Phase-pure VO2 nanoporous structure for binder-free supercapacitor performances

“… 41 MnO 2 -Vertical graphene 5.64 Al 2 O 3 -TiO 2 0.13 Du et al . 42 Carbon nanotube 0.46 Zhou et al . 43 Carbon nanotube/Polypyrrole 18.25 TiVN 15 Achour et al .…”

Self-supporting electrodes of lithium aluminium oxide–carbon nanocomposites synthesized from dicarboxylate-intercalated layered double hydroxide for supercapacitors

“…S7(b)†). We suggest that Al/S-LDH is a promising candidate for application in aluminium electrolytic capacitors due to simple control of the nanostructure and superior dielectric constant ( ε ); the values are 7–10 for aluminium oxide, 39 and 8.4–9.3 for LiAl 5 O 8 . 40 The measured C s values of Al/S-LDH electrode were 14 μF, 10 μF, 9.8 μF, and 9.2 μF at sweep rates of 100 mV s −1 , 300 mV s −1 , 500 mV s −1 , and 1000 mV s −1 , respectively, in the potential range from −0.5 to 0.7 V, (Fig.…”

Electrode Surface‐Modified Strategy for Improving the Voltage of Aqueous Supercapacitors

“…Figure S7d, Supporting Information, demonstrates the H 3 PO 4 treatment strategy, which can form a passivation layer on the surface of the full electrode to inhibit the decomposition of water. [ 38 ] The SEM and energy‐dispersive spectroscopy (EDS) of pristine VACNT are shown in Figure S8, Supporting Information. Figure S9, Supporting Information, shows the morphology and element of Al 2 O 3 ‐treated electrodes.…”

Phase-pure VO2 nanoporous structure for binder-free supercapacitor performances

“… 41 MnO 2 -Vertical graphene 5.64 Al 2 O 3 -TiO 2 0.13 Du et al . 42 Carbon nanotube 0.46 Zhou et al . 43 Carbon nanotube/Polypyrrole 18.25 TiVN 15 Achour et al .…”

Self-supporting electrodes of lithium aluminium oxide–carbon nanocomposites synthesized from dicarboxylate-intercalated layered double hydroxide for supercapacitors

“…S7(b)†). We suggest that Al/S-LDH is a promising candidate for application in aluminium electrolytic capacitors due to simple control of the nanostructure and superior dielectric constant ( ε ); the values are 7–10 for aluminium oxide, 39 and 8.4–9.3 for LiAl 5 O 8 . 40 The measured C s values of Al/S-LDH electrode were 14 μF, 10 μF, 9.8 μF, and 9.2 μF at sweep rates of 100 mV s −1 , 300 mV s −1 , 500 mV s −1 , and 1000 mV s −1 , respectively, in the potential range from −0.5 to 0.7 V, (Fig.…”

Electrode Surface‐Modified Strategy for Improving the Voltage of Aqueous Supercapacitors

“…Figure S7d, Supporting Information, demonstrates the H 3 PO 4 treatment strategy, which can form a passivation layer on the surface of the full electrode to inhibit the decomposition of water. [ 38 ] The SEM and energy‐dispersive spectroscopy (EDS) of pristine VACNT are shown in Figure S8, Supporting Information. Figure S9, Supporting Information, shows the morphology and element of Al 2 O 3 ‐treated electrodes.…”

Phase-pure VO2 nanoporous structure for binder-free supercapacitor performances

“… 41 MnO 2 -Vertical graphene 5.64 Al 2 O 3 -TiO 2 0.13 Du et al . 42 Carbon nanotube 0.46 Zhou et al . 43 Carbon nanotube/Polypyrrole 18.25 TiVN 15 Achour et al .…”