The earliest copper foil electrodes used lead-based alloy anodes and stainless steel electrodes, but they were gradually replaced by coated titanium anodes due to their defects. Coated titanium electrodes have the advantages of light weight, long service life, large current feeding, stable operation, and no environmental pollution, and are widely used around the world. Metals are electrolytically extracted in sulfuric acid solution, and oxygen is precipitated on the anode. It is a very important issue to choose a suitable anode material. Using tantalum-iridium-based coated titanium electrodes, the oxygen overpotential is low and it is not corroded by the electrolyte. The iridium oxide coating shows excellent electrolytic durability. The initial anode potential is 1.51V, and after 6000 hours, it is 1.64V. When using lead-based alloy electrodes (containing Sb 6% to 15%, or Ag1%) in electrolytic production, the lead anode will dissolve, consuming the anode material and affecting the service life of the anode. Moreover, the lead dissolved in the solution will precipitate on the cathode, increasing the lead impurities in the metal and reducing the product quality. The ruthenium coating will be seriously damaged under this working condition, so it is not suitable for use. The initial anode potential is 1.48V, and after 1000 hours, it rises to 2.0V, and the anode has been passivated. The electrode developed by our company has good conductivity; low oxygen evolution potential, and the coating oxide grains are fine (up to nanometer scale); long service life (working life 40000KA.h/m2). Advantages: 1, stable pole spacing 2, can improve capacity 3, high load current, uniform current distribution 4, no pollution on copper foil 5, low energy consumption 6, long working time