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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.
This work was supported by the National Key Research and Development Program of China (Nos. 2016YFA0202601 and 2016YFA0202603), the National Natural Science Foundation of China (Nos. 51425204 and 51602239), the Hubei Provincial Natural Science Foundation of China (No. 2016CFB267), the Fundamental Research Funds for the Central Universities (No. 2017-CL-A1-43). Prof. Liqiang Mai gratefully acknowledged financial support from China Scholarship Council (No. 201606955096).