Fe2C Nanocrystals Encapsulated in an Active Amorphous Carbon Matrix As High Performance Electrodes for Lithium-Ion Batteries

Wednesday, 31 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
H. Che (Shanghai Jiaotong University, Sinopoly Battery Research Center Limited), W. Zhang (Shanghai Jiao Tong University), Y. He, and Z. F. Ma (Shanghai Jiaotong University)
A Fe2C nanocrystals encapsulated into a nitrogen and sulfur dual doped carbon matrix (Fe2C@C) was first synthesized by a simultaneous polymerization-precipitation technique followed with a high temperature pyrolysis process. This method can lead to an effective and homogenous distribution of core/shell Fe2C nanoparticles into the carbon matrix. The optimized material was applied as an anode for a lithium-ion battery, which showed a high capacity, excellent rate performance, and good cycling capability. It delivered a high specific capacity of 657.7 mA h g-1 at a current density of 0.2 A g-1, and even at a very high current density at 6 A g-1, the electrode still retained a very high specific capacity of 509.1 mA h g-1. After 150 cycles of charge/discharge at a current density of 1 A g-1, no capacity decay was observed which presents itself a promising high performance anode for LIBs. Also, the presence of Fe2C can greatly stabilize the structure of the electrode and the electrode process for the lithiation/delithiation of LIBs.