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DFT calculation, other new effective theoretical strategies are very much required to give assistance to the selection of suitable sulfur host among thousands of polar inorganics for Li-S batteries. Besides, nanostructure is also an influencing factor on the properties of the polar materials, such as surface area, pore size, and pore volume, affecting the adsorption capability of the polysulfides. For real practical application of Li-S batteries in the near future, general principle for the rational design of nanostructured polar inorganic hosts is strongly required to maintain the balance among the adsorption capability, sulfur loading mass, and product cost. On the other hand, the research on polar organics used in binders for Li-S batteries is in its early stages. There are a few research reports on polar organics as binders, demonstrating their strong interaction with polysulfides. The ability of polar binders to adsorb polysulfides is mainly determined by their intrinsic polarity. Therefore, the quantity and type of the introduced functional polar groups should be taken into account in designing and synthesizing the novel polar binder, enhancing its polarity as much as possible. In addition to guaranteeing the integrity of the whole electrode and uniform distribution of the cathode materials, we believe that functional binders in the future should possess the features of low cost and high physical adhesion, as well as strong chemical polysulfide-trapping capability. Acknowledgements This work was supported by the National Natural Science Foundation of China (51702079) and the Australian Research Council (ARC) through an ARC Discovery project (DP170102406) and a Future Fellowship (FT150100109). Furthermore, the authors are grateful to Dr Tania Silver for critical reading of the manuscript. Received: ((will be filled in by the editorial staff)) Revised: ((will be filled in by the editorial staff)) Published online: ((will be filled in by the editorial staff)) 17PDF Image | Advances in Polar Materials for Lithium-Sulfur Batteries
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