Li Na Na, Sheng Zhao Min, Tian Hao Liang, Chang Cheng Kang, Jia Run Ping, Han Sheng
School of Materials Science and Engineering, Shanghai Institute of Technology Shanghai 201418 China
RSC Adv. 2018 Sep 24;8(58):33030-33034. doi: 10.1039/c8ra05544k.
Novel FeC nanoparticles encapsulated with nitrogen-doped graphitic shells were synthesized by floating catalytic pyrolysis. Due to the short synthesis time and controllable pyrolytic temperature, the diameters of FeC core nanoparticles ranged from 5 to 15 nm (FeC@NGS900 prepared at 900 °C) and the average thickness of N-doped graphitic shells was ∼1.2 nm, leading to their high electrochemical performance: specific capacity of 1300 mA h g at current density 0.2 A g, outstanding rate capability of 939 mA h g at 3 A g, improved initial coulombic efficiency (FeC@NGS900: 72.1% NGS900 (pure graphitic shells): 52%) for lithium ion batteries (LIBs), and impressive long-term cycle performance (1399 mA h g maintained at 3 A g after 500 cycles for LIBs; 214 mA h g maintained at 1 A g after 500 cycles for sodium ion batteries).
通过浮动催化热解合成了包裹有氮掺杂石墨壳的新型FeC纳米颗粒。由于合成时间短且热解温度可控，FeC核纳米颗粒的直径范围为5至15nm（在900℃制备的FeC@NGS900），氮掺杂石墨壳的平均厚度约为1.2nm，这导致其具有高电化学性能：在电流密度0.2A/g下的比容量为1300mA h/g，在3A/g下的出色倍率性能为939mA h/g，锂离子电池（LIB）的初始库仑效率提高（FeC@NGS900：72.1%，NGS900（纯石墨壳）：52%），以及令人印象深刻的长期循环性能（LIB在500次循环后在3A/g下保持1399mA h/g；钠离子电池在500次循环后在1A/g下保持214mA h/g）。
