| abstract |
The negative electrode active material for lithium secondary batteries and its manufacturing method are provided. The negative electrode active material for a lithium secondary battery is applied to a core including particles of at least one crystalline, amorphous carbonaceous material or mixture thereof, and a heterogeneous element selected from the group consisting of transition metals, alkali metals and alkaline earth metals. Carbon shells comprising amorphous carbonaceous materials. This negative electrode active material mixes an amorphous carbon precursor with a compound containing a heterogeneous element selected from the group consisting of transition metals, alkali metals and alkaline earth metals, and dissolves, melts, softens or disperses the mixture in an organic solvent to form an amorphous carbon precursor solution. To prepare. It is then prepared by coating particles of one or more crystalline, amorphous carbon or mixtures thereof with the amorphous carbon precursor solution. Alternatively, in the manufacturing method, further comprising the step of assembling the particles at the same time as the coating step, to form an amorphous carbon-based material comprising a core comprising secondary particles assembled with at least one particle and the hetero element applied on the core. A negative electrode active material formed of a carbon shell may be prepared.n n n The negative electrode active material for a lithium secondary battery has a high reversible capacity and a low irreversible capacity. In addition, the negative electrode active material for a lithium secondary battery is excellent in high rate charge and discharge characteristics and life characteristics. |