Lithium-sulfur (Li-S) batteries have the become hot candidates for the next-generation of energy storage devices due to their high specific capacity (1675 mA h g-1), low cost and environmental friendliness. However, the low utilization rate of sulfur and the rapid decay of cycle capacity caused by the "shuttle effect" are still gaps that cannot be crossed in the long-term development of Li-S batteries. For break through these bottlenecks, we report a ferromagnetic one-dimensional porous Fe3O4@C (1D-Fe3O4@C) as a sulfur host. Benefitting from its one-dimensional (1D) structure, coated carbon shell and excellent magnetic properties, the as-prepared electrode, besides enhances conductivity, has a strong binding effect on polysulfides through Lorentz force and physical adsorption, thus reducing the "shuttle effect". At the same time, porous morphology is conducive to sulfur loading and accommodates the huge volume changes during cycling. The 1D-Fe3O4@C/S electrode shows excellent specific capacity and superior high-rate cyclability, which is demonstrated by the capacity retention rate of 95.1% and 92.7% for 200 cycles at 1 C and 2 C, respectively.

Ferromagnetic 1D-Fe3O4@C microrods boost polysulfide anchoring for lithium-sulfur batteries

ACS Spring Meeting 2021

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