Lithium sulfur battery (LSB) is widely considered as a next-generation battery system due to its high theoretical energy density of 2567 Wh kg⁻¹. However, several inherent issues obstruct the business application of LSB. To address these issues, we assemble core–shell structure Fe₃O₄@C nanodots with 5 nm diameter as a valid sulfur host via a convenient organic pyrolysis treatment followed by calcination. The nanosized Fe₃O₄ particles could expose more chemisorption sites and inhibit the polysulfides shuttle. Moreover, the carbon layer could not only increase the conductivity but also ensure structural integrity during cyclic process. Furthermore, the mesoporous channels around Fe₃O₄@C could supply sufficient space to load sulfur and physically restrict the shuttle of polysulfides. Thus, the resultant S/Fe₃O₄@C cathode shows a highly initial capacity of 1089 mAh g⁻¹ at 0.2 C, even retains 655 mAh g⁻¹ over 200 cycles at 1 C.

锂硫电池（LSB）由于其2567 Wh kg ^-1的高理论能量密度而被广泛认为是下一代电池系统。但是，一些固有的问题阻碍了LSB的业务应用。为了解决这些问题，我们通过方便的有机热解处理然后煅烧，将直径5 nm的核-壳结构Fe ₃ O ₄ @C纳米点组装为有效的硫主体。纳米级的Fe ₃ O ₄颗粒可以暴露更多的化学吸附位并抑制多硫化物的穿梭。此外，碳层不仅可以增加导电性，而且可以确保循环过程中的结构完整性。此外，Fe ₃ O周围的介孔通道₄ @C可以提供足够的空间来装载硫，并从物理上限制多硫化物的穿梭。因此，所得的S / Fe ₃ O ₄ @C阴极在0.2 C下显示出1089 mAh g ^-1的高初始容量，甚至在1 C下经过200次循环仍保留655 mAh g ^-1。