Amine-assisted synthesis of FeS@N-C porous nanowires for highly reversible lithium storage
iron sulfide, N-doped carbon matrix, porous nanowires, lithium-ion batteries, superior cycling stability
ABSTRACT Iron sulfide is an attractive anode material for lithium-ion batteries (LIBs) due to its high specific capacity, environmental benignity, and abundant resources. However, its application is hindered by poor cyclability and rate performance, caused by a large volume variation and low conductivity. Herein, iron sulfide porous nanowires confined in an N-doped carbon matrix (FeS@N-C nanowires) are fabricated through a simple amine-assisted solvothermal reaction and subsequent calcination strategy. The as-obtained FeS@N-C nanowires, as an LIB anode, exhibit ultrahigh reversible capacity, superior rate capability, and long-term cycling performance. In particular, a high specific capacity of 1,061 mAh·g−1 can be achieved at 1 A·g−1 after 500 cycles. Most impressively, it exhibits a high specific capacity of 433 mAh·g−1 even at 5 A·g−1. The superior electrochemical performance is ascribed to the synergistic effect of the porous nanowire structure and the conductive N-doped carbon matrix. These results demonstrate that the synergistic strategy of combining porous nanowires with an N-doped carbon matrix holds great potential for energy storage.
Tsinghua University Press
Xiujuan Wei,Xin Tan,Jiasheng Meng,Xuanpeng Wang,Ping Hu,Wei Yang,Shuangshuang Tan,Qinyou An,Liqiang Mai, Amine-assisted synthesis of FeS@N-C porous nanowires for highly reversible lithium storage. NanoRes.2018, 11(12): 6206–6216