Progress in preparing anode aluminum foils of high specific capacitance for electrolytic capacitors

The progress of preparing high specific capacitance anode foils used for Al electrolytic capacitors in recently 10 years was reviewed. Sol-gel method、hydrolysis precipitation method、electrochemical deposition method and heat treatment method were summarized mainly. The growth mechanism of films prepared by these methods was discussed. The joint effect of effective area S、formation constant K and relative dielectric constant er is the development trend of preparing high specific capacitance anode aluminum foil.