Lithium metal secondary battery, and negative terminal and porous copper current collector thereof

The present invention relates to the technical field of lithium secondary batteries, and in particular to a porous copper current collector of a lithium metal secondary battery, the porous copper current capable of inhibiting the growth of lithium dendrite and having pore channel structures that are in communication with each other, the pore diameter ranging from 0.1 μm to 2 μm. Compared with the prior art, such three-dimensional pore structures can reduce the effective current density of an electrode by increasing the specific surface area of the electrode, thereby inhibiting the growth of lithium dendrite and stabilizing an SEI film. Moreover, the three-dimensional pore structures of the porous copper current collector can accommodate precipitated lithium metal, thereby slowing down the change in the volume of a lithium metal negative terminal during a cycling charging/discharging process. Therefore, when being applied to the negative terminal of the lithium metal secondary battery, the three-dimensional porous copper current collector can effectively improve the coulombic efficiency, the cycling stability, and the security of the battery during a cycling process.