Lithium-sulfur batteries are promising electrochemical energy storage devices because of their high theoretical specific capacity and energy density. An ideal sulfur host should possess high conductivity and embrace the physical confinement or strong chemisorption to dramatically suppress the polysulfide dissolution. Herein, uniform TiN hollow nanospheres with an average diameter of ~160 nm have been reported as highly efficient lithium polysulfide reservoirs for high-performance lithium-sulfur batteries. Combining the high conductivity and chemical trapping of lithium polysulfides, the obtained S/TiN cathode of 70 wt.% sulfur content in the composite delivered an excellent long-life cycling performance at 0.5C and 1.0C over 300 cycles. More importantly, a stable capacity of 710.4 mAh·g−1 could be maintained even after 100 cycles at 0.2C with a high sulfur loading of 3.6 mg·cm−1. The nature of the interactions between TiN and lithium polysulfide species was investigated by X-ray photoelectron spectroscopy studies. Theoretical calculations were also carried out and the results revealed a strong binding between TiN and the lithium polysulfide species. It is expected that this class of conductive and polar materials would pave a new way for the high-energy lithium-sulfur batteries in the future.

中文翻译：

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具有强大的多硫化锂化学吸附能力的氮化钛空心纳米球作为高级锂硫电池的硫主体

锂硫电池因其较高的理论比容量和能量密度而成为有前途的电化学储能设备。理想的硫主体应具有高电导率，并应包括物理限制或强化学吸附作用，以显着抑制多硫化物的溶解。在此，据报道，平均直径约为160 nm的均匀TiN中空纳米球是用于高性能锂硫电池的高效多硫化锂储库。结合多硫化锂的高电导率和化学捕集，所获得的复合物中硫含量为70％（重量）的S / TiN阴极在300个循环中在0.5C和1.0C下具有出色的长寿命循环性能。更重要的是，即使在0个循环后仍可以保持710.4 mAh·g-1的稳定容量。2C具有3.6 mg·cm-1的高硫负荷。通过X射线光电子能谱研究研究了TiN和多硫化锂物质之间相互作用的性质。还进行了理论计算，结果表明TiN与多硫化锂物质之间具有很强的结合力。可以预期，这类导电和极性材料将在将来为高能锂硫电池铺平新的道路。