▎ 摘　　要

NOVELTY - Lithium pole piece comprises a current collector and a coating area arranged on at least one side of the current collector, where the coated area comprises at least two active layers, a pore forming agent is included in the at least two active layers, the two adjacent active layers that comprise the pore-forming agent are defined as the first active layer and the second active layer respectively, the first active layer is arranged on the current collector, the second active layer is arranged on the side of the first active layer away from the current collector, the porosity of the second active layer is greater than that of the first active layer. USE - The lithium pole piece is used for battery for electric device (all claimed). ADVANTAGE - The lithium pole piece improves the electrolyte wettability of the second active layer and the efficiency of the first active layer in contact with the electrolyte, and improves capacity of the lithium-supplementing agent in the first active layer to improve battery life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: a method for preparing the lithium pole piece, which involves coating at least two layers of slurry comprising a pore-forming agent on a current collector, drying and cold pressing to obtain the lithium pole piece, where at least two layers of slurries comprise pore-forming agents from at least two active layers, one active layer is arranged on the current collector, the other active layer is arranged on a side of the active layer facing away from the current collector, and the porosity in another active layer is greater than the porosity in one active layer; a battery comprising a negative pole piece, a positive pole piece, a separator, and an electrolyte, where the positive pole piece is the lithium pole piece; and an electric device comprising the battery.