The slow Li⁺ transport rate in the thick sulfur cathode of the Li–S battery affects its capacity and cycling performance. Herein, Fe-doped highly ordered mesoporous silica material (Fe–HSBA-15) as a sulfur carrier of the Li–S battery shows high ion conductivity (1.10 mS cm⁻¹) and Li⁺ transference number (0.77). The Fe–HSBA-15/S cell has an initial capacity of up to 1216.7 mA h g⁻¹ at 0.2C and good stability. Impressively, at a high sulfur load of 4.34 mg cm⁻², the Fe–HSBA-15/S cell still maintains an area specific capacity of 4.47 mA h cm⁻² after 100 cycles. This is because Fe–HSBA-15 improves the Li⁺ diffusion behavior through the ordered mesoporous structure. Theoretical calculations also confirmed that the doping of iron enhances the adsorption of polysulfides, reduces the band gap and makes the catalytic activity stronger.

中文翻译：

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具有高离子电导率的埃洛石衍生介孔二氧化硅可改善锂硫电池性能

Li-S电池的厚硫正极中Li ⁺传输速率较慢，影响其容量和循环性能。在此，Fe掺杂的高度有序介孔二氧化硅材料（Fe-HSBA-15）作为Li-S电池的硫载体表现出高离子电导率（1.10 mS cm ^-1）和Li ⁺迁移数（0.77）。 Fe-HSBA-15/S电池在0.2C下的初始容量高达1216.7 mA hg ^-1且稳定性良好。令人印象深刻的是，在4.34 mg cm ^-2的高硫负载下，Fe-HSBA-15/S电池在100次循环后仍保持4.47 mA h cm ^-2的面积比容量。这是因为 Fe-HSBA-15通过有序介孔结构改善了 Li ⁺扩散行为。理论计算也证实铁的掺杂增强了多硫化物的吸附，减小了带隙，使催化活性更强。