Lithium‐sulfur (Li‐S) secondary batteries have been limited by the poor cyclic stability, mainly caused by the dissolution polysulfide species into the electrolyte and subsequent irreversible shuttling effect. Recently, addition of the polysulfide adsorbents within sulfur cathode is effectively improving the electrochemical performance. Herein, TiO₂ integrated with g‐C₃N₄ (TiO₂@g‐C₃N₄: TOCN) hybrid was prepared by a facile heating treatment from the precursor of urea and TiO₂composites, which used as host material for elemental sulfur (TOCN@S) in Li‐S batteries. The multifunctional TOCN not only reduced the electrochemical resistance but also provided strong adsorption sites to immobilize sulfur and polysulfide. As a result, the TOCN@S cathode with a sulfur content of 74.5 wt% and a sulfur loading of 3.1 mg cm⁻²exhibits a high initial capability of 804 mAh g⁻¹ at 0.5°C with capacity retention of 67.2% after 500 cycles. Additionally, the composite cathode also possesses excellent high‐rate performance, retaining a remarkable specific capacity of 630 mAh g⁻¹ even at a rate of 2°C.

中文翻译：

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氧化钛与氮化石墨杂化物结合的协同效应可增强锂硫电池的电化学性能

锂-硫（Li-S）二次电池受循环稳定性差的限制，主要原因是多硫化物类物质溶解到电解质中以及随后产生不可逆的穿梭效应。最近，在硫阴极内添加多硫化物吸附剂有效地改善了电化学性能。在本文中，二氧化钛₂集成了G-C ₃ Ñ ₄（的TiO ₂ @ G-C ₃ Ñ ₄：TOCN）混合从尿素和TiO的前体制备通过一个浅显的加热处理₂复合材料，用作Li‐S电池中元素硫（TOCN @ S）的主体材料。多功能TOCN不仅降低了电化学阻抗，而且还提供了强大的吸附位点来固定硫和多硫化物。结果，硫含量为74.5 wt％，硫负载为3.1 mg cm ^-2的TOCN @ S阴极在0.5°C时具有804 mAh g ^-1的高初始容量，在500℃后容量保持率为67.2％周期。此外，复合阴极还具有出色的高倍率性能，即使在2°C的速率下，仍可保持630 mAh g ^-1的显着比容量。