Abstract:The application of benzotriazole (BTA) in the oxidation resistance of lithium copper foil was studied by means of high temperature oven, scanning electron microscope (SEM) and electrochemical workstation. The results show that the copper foil treated with BTA, BTA+ phytic acid (PA) and BTA+ silane coupling agent (KH792) in the experimental concentration range (BTA mass concentration is 0.1 to 2.0 mg/l) has different degrees of oxidation discoloration and slight yellows after being placed in the oven at 150 ℃ for 10 min. The copper foil treated with BTA+ oxalic acid (OA) passivation solution showed no obvious discoloration under the same conditions, and no significant micromorphology changes were observed by electron microscope. The film resistance and reaction resistance of the passivation film formed by BTA and OA were relatively higher.