Abstract
It is valuable to realize the flexibility of lithium-sulfur batteries, but the unavoidable shuttle effect and the inability of traditional components to withstand bending have brought challenges to related research. Herein, we assembled the bendable self-supporting cathode with carbon nanotube film-loaded sulfur and the modified PP separator with conductive composite interlayer to obtain a bendable lithium-sulfur battery. Benefiting from the charge transport facilitated by both the pore-rich network structure of the bendable substrate and the additional electronic pathways of the conductive interlayer, the assembled bendable lithium-sulfur battery displays a specific capacity as high as 1178 mAh g−1 at 0.1 C and a capacity retention of 66.0 % at 1 C. In addition, the conductive composite interlayer can inhibit the shuttle effect of polysulfide through chemical adsorption and promote its conversion. Moreover, the high flexibility of each component enables the assembled lithium-sulfur battery to withstand repeated bending and exhibits excellent cycling stability (capacity retention of 73.2 % after 500 cycles at 0.5 C) at a bending angle of 150°. This work provides a highly feasible solution to construct lithium-sulfur batteries with desirable energy-storage properties and bendable performance.
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