Abstract
AbstractA freestanding membrane of a 3D network of carbon fibers coated with nitrogen‐doped carbon spheres (NC@FCF) was designed through the carbonization of modified filter paper, on the surface of which polydopamine spheres were deposited. It is found that the NC@FCF membrane is composed of interlaced and circuitous carbon fibers, and the carbon spheres are distributed in the interspaces among carbon fibers. After infiltration with sulfur, the S‐NC@FCF membrane was directly used as a cathode for Li–S batteries. The freestanding cathode exhibits an excellent rate capability, large charge–discharge capacity, and outstanding cycle performance, exhibiting an initial discharge capacity of 1143.7 mAh g−1 and maintaining 778.2 mAh g−1 after 200 cycles at 0.5 C. The excellent electrochemical performance results from the synergistic effect of the 3D carbon‐fiber network, which provides electronic conduction pathways, and the porous structure formed through the accumulation of carbon spheres, which can encapsulate S, absorb polysulfides, and facilitate Li+ transfer.
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