Nitrogen-Doped Carbon-Encapsulated Ordered Mesoporous SiO_x as Anode for High-Performance Lithium-Ion Batteries

SiO_x (0x composite (SiO_x @NC) using 3-aminophenol-formaldehyde (3-AF) as carbon and nitrogen precursor, tetraethyl orthosilicate (TEOS) as the silica precursor, and cationic surfactant cetyltrimethylammonium bromide (C₁₆ TAB) as the mesoporous template. The obtained composite electrode not only can effectively reduce the volume expansion, but also can effectively improve electronic conductivity and further enhance the charge and ion transfer kinetics. Benefiting from the unique structural merits, the obtained SiO_x @NC-2 delivers a high reversible capacity of 602.4 mAh g^-1 at 0.1 A g^-1 after 100 cycles and long-term cyclability (maintain 426.1 mAh g^-1 over 1000 cycles at 1 A g^-1 ).