▎ 摘　　要

NOVELTY - Anode active material comprises silicon-based core particles; and outer carbon coating layers formed on the silicon-based core particles, where the outer carbon coating layers comprise graphene having a ratio of D band peak intensity and G band peak intensity (D/G ratio) of less than or equal to 0.35 in the Raman spectrum. USE - The active material is useful in an anode electrode used in a secondary battery for an application such as a cellular phone, a notebook computer, a digital camera and an electric vehicle application such as a hybrid electric vehicle, preferably used as a battery module of a medium or large-sized battery module. ADVANTAGE - The active material provides the secondary battery capable of improving lifetime characteristics and high temperature storage characteristics while realizing high capacity and energy density of a silicon-based active material, is capable of effectively preventing deterioration of electrical contact between active materials caused by volume expansion/contraction of an active material and improving lifespan characteristics when using the silicon-based active material and capable of preventing a side reaction with an electrolyte and improving high-temperature storage characteristics when using the silicon-based active material, exhibits excellent capacity characteristics and can provide a large-sized battery module comprising the secondary battery as a unit cell. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for manufacturing the active material involving mixing silicon-based core particles and graphene flakes and heat-treating the obtained mixture to obtain the product; (2) an anode electrode comprising an anode electrode current collector and an anode active material layer formed on the current collector, where the active material layer comprises an anode electrode material, a binder and a conductive material including the active material; and (3) a secondary battery comprising the anode electrode, a cathode electrode facing the anode electrode, a separator interposed between the anode electrode and the cathode electrode and an electrolyte.