Although lithium-sulfur (Li–S) batteries have attracted lots of attention due to their relatively low cost and high theoretical energy density, the shuttle effect caused by dissolution of lithium polysulfides (Li₂S_n) and low conductivity of S/Li₂S have hampered the development of this technology. Instead of pure sulfur, TiS₂ nanosheets aggregates are synthesized through a facile two-step method and used as the incipient cathode in Li–S batteries, which show high specific capacity and durable cyclic life. Even under an ultra-high charge density of 1 A g⁻¹, the battery can maintain a capacity over 300 mAh g⁻¹ after 1,000 cycles. Experimental results and the first-principles calculations illustrate that the primary capacity contributor gradually changes from TiS₂ to Li₂S during the long-term cycles due to the tendency of Ti–S bond cleavage and Li–S bond formation, thus the in-built Li–S counterparts take shape from the Li–TiS₂ battery. Meanwhile, the emerging Ti atomic layers can act as the current collector, helping the charge transfer for the redox reactions of Li₂S.

尽管锂硫（Li–S）电池由于其相对较低的成本和较高的理论能量密度而引起了很多关注，但由多硫化锂（Li ₂ S _n）的溶解和S / Li _2的电导率低引起的穿梭效应S阻碍了这项技术的发展。通过简便的两步法合成TiS ₂纳米片聚集体，而不是纯硫，并用作Li-S电池中的初始阴极，显示出高的比容量和持久的循环寿命。即使在1 A g ^-1的超高充电密度下，电池也可以保持300 mAh g ^-1以上的容量在1,000个周期之后。实验结果和第一性原理计算表明，由于Ti–S键断裂和Li–S键形成的趋势，在长期循环中，主要的容量贡献者从TiS ₂逐渐变为Li ₂ S，因此-内置的Li–S对应物由Li–TiS ₂电池成型。同时，新兴的Ti原子层可以充当集电器，帮助电荷转移到Li ₂ S的氧化还原反应中。