writer：Xin Gu, Xuebo Zhao
keywords：Sodium ion battery, Porous Carbon, N-doping
source：期刊
specific source：Chemistry Select,2016,1,20,6442-6447
Issue time：2016年
Sodium-ion batteries have been regarded as probable alternatives to lithium-ion batteries in the field of large-scale energy storage. In this work, nitrogen-doped porous carbon (NPC) polyhedrons are fabricated by using nitrogen-containing metal-organic frameworks as novel templates and precursors. The resultant NPC materials exhibit unique structure features, including porous structure, high-level nitrogen-doping and large surface areas. Among the NPC materials obtained at different annealing temperatures, NPC-600 exhibits the best sodium storage properties for sodium-ion batteries. The correlations between electrochemical properties and structure/composition of the NPC materials are disclosed. The best NPC-600 delivers a high reversible capacity of 231?mA h g?1 at 0.05?A g?1, superior rate capability with a stable capacity of 145?mA h g?1 at 1?A g?1, and good long-term cycling stability with a stable capacity of 182?mA h g?1after cycling at 0.5?A g?1 for 500 cycles. The excellent sodium storage performances can be ascribed to the porous structure with enhanced reaction kinetics and high-level nitrogen-doping with high electrochemical reactivity.