Solution-Sheared Ultrathin Short-Side-Chain Perfluorosulfonic Acid-based Interlayer for Effective Inhibition of Shuttle Effect in Li-S Batteries
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As one of the most promising candidates for next-generation batteries, lithium-sulfur batteries have gained considerable attention owing to the high theoretical capacity and naturally abundant sulfur. However, its commercial use has been hindered mainly by the shuttle effect. Herein, an ultrathin CNT/Aquivion/PEDOT:TCB (CAP) interlayer is fabricated via solution shearing method, which allows large area printing and uniform film formation. With the presence of high-density sulfonate groups of Aquivion, the CAP interlayer can effectively suppress shuttle phenomenon through electrostatic repulsion. The conductivity of the CAP interlayer also enables the reactivation of lithium polysulfide species, resulting in a high capacity of 1186 mAh g-1 after 250 cycles and an enhanced cycling stability. In addition, this study introduces Marangoni effect-assisted film transfer, a novel film transfer technique, which facilitates easy transfer of interlayer film to the commercially used separator.