NEGATIVE POLE ACTIVE SUBSTANCE FOR LITHIUM SECONDARY BATTERY AND METHOD FOR PRODUCING SAME

摘要

The present invention provides a negative pole material for a lithium secondary battery, with which it is possible to prolong the cycle life of a lithium secondary battery. The present invention relates to a negative pole active substance for a lithium secondary battery, said negative pole active substance comprising a powder formed by performing, in the following order, a step for producing an etched foil by etching both surfaces of a foil comprising Al having a purity of 90 mass% or higher, and a step for cutting this etched foil.