Electrode with gradient pore structure and preparation method and application thereof

The invention belongs to the technical field of lithium batteries, and particularly relates to an electrode with a gradient pore structure and a preparation method and application thereof. An electrode comprises a current collector and a coating located on the surface of the current collector, and the coating comprises a first coating and a second coating located on the first coating; the first coating is close to the surface of the current collector; the first coating comprises active particles; the active particulate matters have two different ranges of particle sizes; the second coating comprises active particles; and the active particulate matters have only one range of particle sizes. The active particles with different particle sizes in the first coating and the second coating are matched, so that the electrode with a gradient pore structure is obtained, the porosity is increased, the tortuosity is reduced, the electrode reaction and the active particles are uniformly utilized, and the lithium ion liqui