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PbO2 thin film is essential for applications in lead acid batteries system. In this work, PbO2 thin films with different surface microstructure were fabricated through electrodeposition technique by controlling the deposition current density. Though PbO2 thin films with porous structure are achieved at a high electrodeposition current density, the softening and leaching of the active materials on the electrode leads to a bad cycling charge-discharge ability. PbO2 thin film fabricated at a low current density(PbO2-20) has a compact and dense surface, and an activation process is needed to reach its maximum discharge ability with an improved cycling charge-discharge ability. Meanwhile, a porous structure is formed due to the active material expansion-contraction process, and then the discharge capacity is gradually reduced as observed in PbO2 thin films obtained at high current density. Specifically, when PbO2-20 film is assembled in a laboratory battery, the cycle charge-discharge life is 553 times at 1C with 30% depth of discharge much higher than that of PbO2 thin film electrodeposited at a high current density.

Electrodeposited PbO2 Thin Films with Different Surface Structure as Positive Plate in Lead Acid Batteries