Bottom-up synthesis of nitrogen-doped graphene sheets for ultrafast lithium storage
Xian-Yong Wei,Quan-Chao Zhuang,Chen-Hui Jiang,Guang-Yao Ma,Zhi-Min Zong,Shi-Gang Sun
Nanoscale Pub Date : 03/26/2014 00:00:00 , DOI:10.1039/C4NR00454J
Abstract

A facile bottom-up strategy was developed to fabricate nitrogen-doped graphene sheets (NGSs) from glucose using a sacrificial template synthesis method. Three main types of nitrogen dopants (pyridinic, pyrrolic and graphitic nitrogens) were introduced into the graphene lattice, and an inimitable microporous structure of NGS with a high specific surface area of 504 m2 g−1 was obtained. Particularly, with hybrid features of lithium ion batteries and Faradic capacitors at a low rate and features of Faradic capacitors at a high rate, the NGS presents a superior lithium storage performance. During electrochemical cycling, the NGS electrode afforded an enhanced reversible capacity of 832.4 mA h g−1 at 100 mA g−1 and an excellent cycling stability of 750.7 mA h g−1 after 108 discharge–charge cycles. Furthermore, an astonishing rate capability of 333 mA h g−1 at 10 000 mA g−1 and a high rate cycle performance of 280.6 mA h g−1 even after 1200 cycles were also achieved, highlighting the significance of nitrogen doping on the maximum utilization of graphene-based materials for advanced lithium storage.

Graphical abstract: Bottom-up synthesis of nitrogen-doped graphene sheets for ultrafast lithium storage