| abstract |
The present invention is an electrode comprising (a) an electrode; and (b) a porous active layer coated on at least one surface of the electrode and formed of a mixture of a large number of inorganic particles and a binder polymer, In the porous active layer, the content ratio of the binder polymer / inorganic particles existing on the surface is larger than the content ratio of the binder polymer / inorganic particles existing inside, the composition morphology in the thickness direction is different ( There are provided an electrode coated with a porous active layer characterized by having a heterogeneity), a method for producing the electrode, and an electrochemical device including the porous active layer. The electrode coated with the porous active layer of the present invention has a porous activity in which the content ratio of the binder polymer / inorganic particles in the surface layer is larger than the internal content ratio on at least one surface of the negative electrode, the positive electrode, or both electrodes. By introducing the layer, the resistance of the porous active layer to peeling and scratching can be increased, and the lamination characteristics with the porous separation membrane can be improved. As a result, the problem that the inorganic particles in the porous active layer fall off during the assembly process of the electrochemical device can be improved, so that the safety and performance of the battery can be improved simultaneously. |