Bottom-up synthesis of nitrogen-doped graphene sheets for ultrafast lithium storage.
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 m(2) 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.
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China. wei_xianyong@163.com.
Lei-Lei
LL
Tian
Xian-Yong
XY
Wei
Quan-Chao
QC
Zhuang
Chen-Hui
CH
Jiang
Chao
C
Wu
Guang-Yao
GY
Ma
Xing
X
Zhao
Zhi-Min
ZM
Zong
Shi-Gang
SG
Sun