▎ 摘　　要

NOVELTY - Preparing reduced acylated graphene oxide involves: (a) subjecting graphene oxide to an acylation reaction to prepare acylated graphene oxide; and (b) reducing the acylated graphene oxide. USE - Method for preparing reduced acylated graphene oxide used in electrode active material of lithium secondary battery (all claimed). ADVANTAGE - The lithium secondary battery employing negative electrode active material has low resistance, a high battery capacity, and improved rate-limiting characteristics while having stable cycle characteristics. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: i. reduced acylated graphene oxide; and ii. lithium secondary battery, which comprises a negative electrode including the electrode active material and a conductive material; a separator set on the negative electrode; and a positive electrode disposed on the separator.