Electrode plate and electrochemical device

An electrode plate comprising a current collector (10, 20) and an electrode active material layer (11, 21) disposed on at least one surface of the current collector (10, 20), wherein, the current collector (10, 20) comprises a support layer (101, 201) and a metal conductive layer (102, 202) disposed on at least one surface of the support layer (101, 201), the metal conductive layer (102, 202) has a single-sided thickness D2 that satisfies:

• 30 nm≤D2≤3 μm;
• and
• the electrode active material layer (11, 21) comprises an electrode active material, a binder and a conductive agent;
• and the electrode active material layer (11, 21) is divided into two regions, an inner region and an outer region, in a thickness direction of the electrode active material layer;
• and the conductive agent is unevenly distributed in the electrode active material layer (11, 21) in a thickness direction of the electrode active material layer (11, 21), in which the weight percentage of the conductive agent in the inner region of the electrode active material layer is higher than the weight percentage content of the conductive agent in the outer region of the electrode active material layer (11, 21) based on the total weight of the electrode active material layer (11, 21), and the conductive agent in the inner region of the electrode active material layer (11, 21) comprises at least one of a one-dimensional conductive carbon and a two-dimensional conductive carbon;
• and the conductive agent is present in a weight percentage of 50% to 80% and the binder is present in a weight percentage of 20% to 50%, based on the total weight of the electrode active material layer (11, 21) at the inner region;
• and
• the electrode active material layer (11, 21) is in direct contact with the conductive layer (102, 202) and the conductive layer (102, 202) is in direct contact with the support layer (101,201) or the conductive layer (102, 202) is further provided with a protective layer (103, 203) on its surface, the protective layer (103, 203) being provided on one surface of the conductive layer (102, 202) of the current collector (10, 20) toward the support layer (101, 201);
• the protective layer (103, 203) is a metal protective layer or a metal oxide protective layer;
• and the protective layer (103, 203) has a thickness that satisfies:
• D3≤ 1/10D2 and 5 nm≤D3≤500 nm;
• and
• the support layer comprises a material selected from at least one of insulating polymer materials, insulating polymer composite materials, conductive polymer materials, and conductive polymer composite materials, preferably from insulating polymer materials, or insulating polymer composite materials.