Synchronous construction of Fe1−xS-embedded and interconnected carbon matrices for high‐performance lithium‐ion batteries anode

Iron sulfide has stood out from various anode materials on account of its high capacity, low price and environment friendliness. In practice, however, the critical obstacles of iron sulfide limit its practical application, including poor intrinsic conductivity, volume expansion and polysulfide dissolution during charge and discharge. Herein, the carbon-coated Fe 1− x S composite with unique interconnected carbon matrices (Fe 1− x S@C NW) was successfully synthesized via a facile one-step in situ thermal condensation method, which is intended to improve the conductivity of iron sulfide anode. In this composite, Fe 1− x S is surrounded by unique interconnected carbon matrices to facilitate lithium ion diffusion and electron transport. Compared with Fe 1− x S@C and Fe 1− x S anode, the as-synthesized Fe 1− x S@C NW anode exhibits high-rate performance (with a reversible capacity of 446 mAh g − 1 even at 4 A g − 1 ) and low Rct value (58.2 Ω). The combination of unique interconnected carbon matrices and Fe 1− x S may be responsible for the superior rate performance and low Rct of Fe 1− x S@C NW anode.