Hierarchically porous nitrogen-rich carbon derived from wheat straw as an ultra-high-rate anode for lithium ion batteries

作者：Chen Li; Zhang Yongzhi; Lin Chaohong; Yang Wen; Meng Yan; Guo Yong; Li Menglong^*; Xiao Dan

来源：Journal of Materials Chemistry A, 2014, 2(25): 9684-9690.

DOI：10.1039/c4ta00501e

A facile, economical and effective method to produce hierarchically porous nitrogen-rich carbon (HPNC) from wheat straw has been reported. Acid pretreatment is introduced before KOH activation, and plays the role of promoting the formation of thinner pore walls. Without any N-doping, the N content is as high as 5.13%. The HPNC when used as an anode for Li-ion batteries exhibits a superior specific capacity of 1470 mA h g(-1) at 0.037 A g(-1), and possesses an ultrahigh rate capability of 344 mA h g(-1) at 18.5 A g(-1). Even at an extremely high current density of 37 A g(-1), the reversible capacity is still as high as 198 mA h g(-1).

• 出版日期2014-7-7
• 单位四川大学