Surface-modified copper foil negative electrode current collector for sodium metal battery and preparation method and application of surface-modified copper foil negative electrode current collector

The invention discloses a surface-modified sodium metal battery copper foil negative electrode current collector and a preparation method and application thereof. The surface-modified sodium metal battery copper foil negative electrode current collector is a copper foil current collector of which the surface is modified with a bismuth nano tetrahedron. When the surface-modified sodium metal battery copper foil negative electrode current collector is used as a negative electrode material of a sodium metal battery, on one hand, uniform deposition and deplating of sodium metal can be realized, and the electrochemical performance of the battery is improved; and on the other hand, the whole battery system has higher energy density due to the battery system without the metal negative electrode. 本发明公开一种表面修饰的钠金属电池铜箔负极集流体及其制备方法与应用。所述表面修饰的钠金属电池铜箔负极集流体为表面修饰有铋纳米四面体的铜箔集流体。本发明的表面修饰的钠金属电池铜箔负极集流体作为钠金属电池的负极材料，一方面可以实现钠金属均匀沉积与脱镀，提高电池电化学性能；另一方面，无金属负极的电池体系使整个电池体系具有更高的能量密度。