| 摘要 |
A negative electrode active material for a secondary battery, its preparation method, and a secondary battery containing the negative electrode active material are provided to improve efficiency and cycle characteristics by stabilizing the surface of a negative electrode active material. A negative electrode active material comprises 100 parts by weight of a core carbon material; 0.1-30 parts by weight of a low crystalline carbon; and 1-30 parts by weight of a fluorine-based compound. Preferably the fluorine-based compound is at least one selected from the group consisting of CsF, KF, LiF, NaF, RbF, TiF, AgF, AgF2, BaF2, CaF2, CuF2, CdF2, FeF2, HgF2, Hg2F2, MnF2, MgF2, NiF2, PbF2, SnF2, SrF2, XeF2, ZnF2, AlF3, BF3, BiF3, CeF3, CrF3, DyF3, EuF3, GaF3, GdF3, FeF3, HoF3, InF3, LaF3, LuF3, MnF3, NdF3, VF3, PrF3, SbF3, ScF3, SmF3, TbF3, TiF3, TmF3, YF3, YbF3, CeF3, GeF3, HfF3, SiF3, SnF3, TiF3, VF3, ZrF3, NbF5, SbF5, TaF5, BiF5, MoF6, ReF6, ReF6, SF6 and WF6. |
