摘要：SummaryLithium-sulfur batteries are paid much attention owing to their high specific capacity and energy density. However, their practical applications are impeded by poor electrochemical performance due to the dissolved polysulfides. The concentration of soluble polysulfides has a linear relationship with the internal heat generation. The issue of heat transport inside lithium-sulfur batteries is often overlooked. Here, we designed a functional separator that not only had a high thermal conductivity of 0.65 W m−1K−1but also alleviated the diffusion of dissolved active materials to the lithium anode, improving the electrochemical performance and safety issue. Lithium-sulfur batteries with the functional separator have a specific capacity of 1,126.4 mAh g−1at 0.2 C, and the specific capacity can be remained up to 893.5 mAh g−1after 100 cycles. Pouch Cells with high sulfur loading also showed a good electrochemical performance under a lean electrolyte condition of electrolyte/sulfur (E/S) = 3 μL mg−1.Graphical AbstractDisplay OmittedHighlights•Fast heat transport inside Li-S batteries was designed by a simple method•Pouch cells showed a good electrochemical performance under a lean electrolyte condition•In situ2D XANES was conducted to explore the mechanism of Li-S batteriesElectrochemical Energy Storage; Energy Storage; Energy Materials
