ELECTRODE FOR SECONDARY BATTERY, PREPARATION THEREOF, AND SECONDARY BATTERY AND CABLE-TYPE SECONDARY BATTERY COMPRISING THE SAME

摘要

The present disclosure provides a sheet-form electrode for a secondary battery, comprising a current collector; an electrode active material layer formed on one surface of the current collector; a porous organic-inorganic layer formed on the electrode active material layer and comprising inorganic particles and a polymer binder; and a first porous supporting layer formed on the porous organic-inorganic layer. The sheet-form electrode for a secondary battery according to the present disclosure has supporting layers on at least one surfaces thereof to exhibit surprisingly improved flexibility and prevent the release of the electrode active material layer from a current collector even if intense external forces are applied to the electrode, thereby preventing the decrease of battery capacity and improving the cycle life characteristic of the battery.

主权项

1. A method of preparing a sheet-form electrode for a secondary battery, comprising
(S1) applying a slurry containing an electrode active material on one surface of the current collector, followed by drying, to form an electrode active material layer; (S2) applying a mixed organic-inorganic slurry containing inorganic particles and a polymer binder on the electrode active material layer; (S3) forming a first porous supporting layer on the mixed organic-inorganic slurry which is applied; and (S4) compressing the resultant obtained in step (S3) to form a porous organic-inorganic layer which is adhered between the electrode active material layer and the first porous supporting layer to be integrated with each other.