Reduced graphene oxide/TiO2(B) nanocomposite-modified separator as an efficient inhibitor of polysulfide shuttling in Li-S batteries

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Abstract

The shutting effect in lithium-sulfur (Li-S) batteries hinders their widespread application, which can be restrained effectively by a modified separator. In this work, a composite of reduced graphene oxide and beta-phase TiO2 nanoparticles (RGO/TiO2(B)) is designed as a separator modification material for improving the electrochemical behavior of Li-S batteries. The TiO2(B) nanoparticles are in situ prepared and tightly adhere to the RGO layer. A series of examinations demonstrated that the RGO/TiO2(B)-coated separator efficiently inhibits the polysulfide shuttling phenomenon by the cooperative effect of physical adsorption and chemical binding. Specifically, as modified separators, a comparison between TiO2(B) and anatase TiO2(A) each composited with RGO has been conducted. The TiO2(B) sample not only exhibits a superior blocking character of migrating polysulfides, but also enhances battery electrochemical kinetics by fast Li ion diffusion.

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Chen, P., Wang, Z., Zhang, B., Liu, H., Liu, W., Zhao, J., … Su, Z. (2020). Reduced graphene oxide/TiO2(B) nanocomposite-modified separator as an efficient inhibitor of polysulfide shuttling in Li-S batteries. RSC Advances, 10(8), 4538–4544. https://doi.org/10.1039/c9ra10185c

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