Method for manufacturing self-standing film for negative-electrode of lithium secondary battery, and self-standing film for negative-electrode of lithium secondary battery

Abstract

A method for manufacturing a self-standing film for a negative-electrode of a lithium secondary battery includes performing a first film formation process using a composition for forming the negative-electrode of the lithium secondary battery to obtain a first negative-electrode active material layer, wherein the composition includes a negative-electrode active material, a conductive material, and a binder; pulverizing the first negative-electrode active material layer to obtain composite powders for formation of the negative-electrode as a pulverized product; and performing a second film formation process using the composite powders to obtain a second negative-electrode active material layer, wherein the binder includes a triblock copolymer having: a soft block derived from an aliphatic or cycloaliphatic diene-based monomer and having a rubber phase at room temperature; and a first hard block and a second hard block respectively connected to both ends of the soft block, and derived from an aromatic ring-containing ethylenically unsaturated monomer, and having a glass phase at room temperature. Further, the self-standing film for the negative-electrode manufactured using the method is provided.

Dependencies are inferred from the claim text.