3.Pricesareoverwhelminglysuperiortoothertypesbecauseelectrolyticcapacitorsaremadeofcommonindustrialmaterials,suchasaluminum.Electrolyticcapacitormanufacturingequipmentarealsoordinaryindustrialequipment,canbeproducedinlarge-scale,relativelylowcost.Principleeditelectrolyticcapacitorsareusuallymadeofmetalfoil(aluminum/tantalum)aspositiveelectrode,andtheinsulatingoxidelayerofmetalfoil(alumina/tantalumpentoxide)asdielectric.Electrolyticcapacitorsaredividedintoaluminumelectrolyticcapacitorsandtantalumelectrolyticcapacitorsaccordingtotheirpositiveelectrodes.Thenegativeelectrodeofaluminumelectrolyticcapacitoriscomposedofthinpaper/filmorelectrolytepolymerimpregnatedwithelectrolytesolution(liquidelectrolyte),andthenegativeelectrodeoftantalumelectrolyticcapacitorisusuallymanganesedioxide.Sinceelectrolytesareusedasnegativeelectrodes(attentionanddielectric),electrolyticcapacitorsarenamedafterelectrolyticcapacitors.)