An electrochemical device includes a negative electrode. The negative electrode includes a current collector layer, a lithium metal layer, and a porous framework layer that are arranged in sequence. The porous framework layer is partly intercalated in the lithium metal layer. A thickness by which the porous framework layer is intercalated in the lithium metal layer is 0.2 μm to 50 μm. The electrochemical device achieves excellent cycle performance and relatively high safety and reliability.