Na+-storage properties derived from a high pseudocapacitive behavior for nitrogen-doped porous carbon anode

High content N-doped porous carbon (NPC) has been fabricated and used as SIBs anode material. The NPC delivers a high capacity (230.1 mAh g(-1) at 0.1 A g(-1)), excellent rate capability (195.8 mAh g(-1) at 5 A g(-1)) and cycling stability (201.1 mAh g(-1) at 1 Ag-1 after 500 cycles). The excellent performances are ascribed to the unique porous structure and high content of N doped in NPC, they can also provide more active sites for Na+ ions accommodation and generate plenty of channels for the Na+ ions/electron transmission, which can greatly improve its pseudocapacitive effect and buffer the volume expansion during the cycling. The excellent Na+ ions storage capability makes the NPC a promising anode material for SIBs. (C) 2019 Elsevier B.V. All rights reserved.