Abstract:With the rapid development of the new energy industry, the demand for lithium-ion batteries and other power batteries is increasing, and electrolytic copper foil as a negative collector of lithium-ion batteries, if the tensile strength is not enough, it is easy to cause the battery cracking and reduce the battery capacity. The effects of hydroxyethyl cellulose (HEC) with different mass concentrations on the structure and properties of 4 μm ultra-thin lithium copper foil were investigated. XRD results show that with the increase of HEC mass concentration, the optimization coefficient of Cu(111) crystal face drops gradually, and the optimization coefficient of Cu(220) crystal face increases gradually, indicating the optimal orientation growth of Cu(220) crystal face. The performance results show that 4 μm ultra-thin high-tensile copper foil with tensile strength of 567.89 MPa, elongation of 3.63%, roughness of 1.26 μm and glossiness of 121 GU can be obtained when the mass concentration of HEC is 9 mg/L, which provides the research direction for ultra-thin high-tensile copper foil.