Chemical anchor effect is an efficient route for polysulfides immobilization to enhance the performance of Li–S battery. Transition metal oxides are suitable chemical anchor matrix as Lewis acid coordinated with sulfur atoms in the form of Lewis base. Ion bonds may also be formed between anions in transition metal compounds and lithium ions in lithium polysulfides alleviating the shuttle effect. Reducing their crystal sizes to expose more surface active sites and expand surface areas is pivotal to sufficiently immobilize polysulfides. Here, an optimized GFM-2 composite was fabricated, where the 20 nm metal oxide particles aggregated by the 3–5 nm Fe₂O₃ and Mn₃O₄ binary crystals are uniformly distributed on the reduced graphene oxide (rGO) nanosheets. A high specific surface area up to 144.9 m² g⁻¹ was obtained for the GFM-2. The modified sulfur@rGO (S@G) cathode obtained by mixing S@G and GFM-2 additive with the mass ratio of 20: 1, presented high specific discharge capacities of 1356.3 and 770.2 mAh g⁻¹, respectively, at scan rates of 0.1 and 5C (1C = 1675 mAh g⁻¹) under conventional electrolyte dosage with electrolyte/sulfur (E/S) = 30 mL g_(S)⁻¹ and sulfur loading of 1.1 mg cm⁻². The capacity was 1053.5 mAh g⁻¹ at 1C and maintained at 530.1 mAh g⁻¹ after 1000 cycles with the low average capacity decay rate of each cycle of 0.049%. Under low electrolyte dosages of E/S = 15 and 8 mL g_(S)⁻¹, the high capacities of 1308.0 and 1230.4 mAh g⁻¹ could be still obtained at 0.1C, respectively. When the sulfur loading was increased to 2.8 mg cm⁻² and E/S was reduced to 10 mL g_(S)⁻¹, the good capacity of 1163.6 mAh g⁻¹ was gotten at 0.1C. The high capacity and high cyclic property under different E/S and sulfur loading amounts indicate the potential for practical application of this simple but effective modified sulfur cathode.

化学锚定作用是固定多硫化物以增强Li-S电池性能的有效途径。过渡金属氧化物是合适的化学锚定基质，因为路易斯酸与路易斯原子形式的硫原子配位。也可以在过渡金属化合物中的阴离子与多硫化锂中的锂离子之间形成离子键，从而减轻穿梭效应。减小其晶体尺寸以暴露更多的表面活性位点并扩大表面积是充分固定多硫化物的关键。在这里，制造了优化的GFM-2复合材料，其中20 nm的金属氧化物颗粒由3–5 nm的Fe ₂ O ₃和Mn ₃ O ₄聚集。二元晶体均匀分布在还原的氧化石墨烯（rGO）纳米片上。对于GFM-2，获得了高达144.9 m ² g ^-1的高比表面积。通过将质量比为20：1的S @ G和GFM-2添加剂混合而获得的改性硫@ rGO（S @ G）阴极在扫描速率下分别具有1356.3和770.2 mAh g ^-1的高比放电容量在常规的电解质剂量下，电解液/硫（E / S）= 30 mL g _（S）^-1和硫负荷为1.1 mg cm ^-2时，可得到0.1和5C（1C = 1675 mAh g ^-1）的^电导率。1C时的容量为1053.5 mAh g ^-1并保持在530.1 mAh g ^-11000次循环后，每个循环的平均容量衰减率较低，为0.049％。在低电解质剂量E / S = 15和8 mL g _（S）^{-1的情况下}，仍可在0.1C时分别获得1308.0和1230.4 mAh g ^-1的高容量。当硫负载增加至2.8mg cm ^-2且E / S降低至10mL g _（S）^-1时，在0.1 ℃下获得了1163.6mAh g ^-1的良好容量。在不同E / S和硫负载量下的高容量和高循环性能表明该简单但有效的改性硫阴极的实际应用潜力。