Lithium-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⁻¹ K⁻¹ but 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⁻¹ at 0.2 C, and the specific capacity can be remained up to 893.5 mAh g⁻¹ after 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.

锂硫电池由于其高的比容量和能量密度而备受关注。然而，由于溶解的多硫化物，电化学性能差而阻碍了它们的实际应用。可溶性多硫化物的浓度与内部发热呈线性关系。锂硫电池内部的传热问题经常被忽略。在这里，我们设计了一种功能性隔板，该隔板不仅具有0.65 W m ^-1 K ^-1的高导热率，而且还减轻了溶解的活性物质向锂阳极的扩散，改善了电化学性能和安全性问题。带有功能隔板的锂硫电池的比容量为1,126.4 mAh g ^-1在0.2 C下，比容量可以在100个循环后保持高达893.5 mAh g ^-1。在电解质/硫（E / S）= 3μLmg ^-1的稀薄电解质条件下，高硫负载的袋式电池也显示出良好的电化学性能。