| abstract |
The present disclosure relates to a negative electrode material including, as an active material, silicon flakes with a hyperporous structure, represented by the following chemical formula 1: n x Si.(1− x )A (1)n where 0.5≤x≤1.0, and A is an impurity, and includes at least one compound selected from the group consisting of Al 2 O 3 , MgO, SiO 2 , GeO 2 , Fe 2 O 3 , CaO, TiO 2 , Na 2 O K 2 O, CuO, ZnO, NiO, Zr 2 O 3 , Cr 2 O 3 and BaO, and a preparing method of the silicon flakes. |