Synthesis of hierarchically porous MnO/C composites via a sol-gel process followed by two-step combustion for lithium-ion batteries
Hierarchically porous MnO/C composites with interconnected macropores and co-continuous skeletons were fabricated via a sol-gel process combined with phase separation, followed by two-step combustion. The MnO nanoparticles were assembled into the carbonaceous skeletons to construct hierarchical porous MnO/C composites. The resultant MnO/C composites used as active material of the lithium-ion battery exhibit outstanding specific capacity of 1107 mAh g-1 after 300 cycles at 200 mA g-1 and great rate capability with 610 mAh g-1 at 2 A g-1. Moreover the specific capacity can retain 480 mAh g-1 at 1 A g-1 after 1000 cycles. The superior electrochemical Li-storage property with a high specific capacity, great cycling durability and excellent rate performance is rationally associated with the intrinsic structural advantages and component effects derived from hierarchical porous structures. The MnO/C composites via facile sol-gel synthesis followed by two-step combustion demonstrates its potential of being applied to well-performed Li-ion batteries.