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首页> 外文期刊>ACS applied materials & interfaces >Balancing the Seesaw: Investigation of a Separator to Grasp Polysulfides with Diatomic Chemisorption
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Balancing the Seesaw: Investigation of a Separator to Grasp Polysulfides with Diatomic Chemisorption

机译：平衡跷跷板：调查分离器，以掌握硅藻化的多硫化物

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摘要

Lithium-sulfur (Li-S) batteries are promising next-generation high-density energy storage systems due to their advantages of high theoretical specific capacity, environmental compatibility, and low cost. However, high-order polysulfides dissolve in the electrolyte and subsequently lead to the undesired polysulfide shuttle effect, which hinders the commercialization of Li-S batteries. To tackle this issue, morpholine molecules were successfully grafted onto a commercial polypropylene separator. Density functional theory (DFT) calculations were performed and revealed that morpholine side chains could equally and reversibly grasp all the high-order polysulfides. This diatomic chemisorption adjusted the transformation process among the sulfur-related compounds. The modified separator battery possessed a discharge capacity as high as 827.8 mAh.g(-1) after 500 cycles at 0.5 C. The low capacity fading rate, symmetrical cyclic voltammogram, and retention of the electrode morphology all suggest that the diatomic equal adsorption approach can successfully suppress the polysulfide shuttle effect while maintaining excellent battery performance.
机译：锂 - 硫磺（LI-S）电池采用下一代高密度储能系统，因为它们具有高理论特异性容量，环境兼容性和低成本的优点。然而，高阶多硫化物溶解在电解质中，随后导致不需要的多硫化物梭效果，阻碍了Li-S电池的商业化。为了解决这个问题，将吗啉分子成功接枝到商业聚丙烯分离器上。进行密度函数理论（DFT）计算，并揭示了吗啉侧链可以同样可逆地掌握所有高阶多硫化物。这种硅藻化学吸附调节了硫相关化合物中的转化过程。改性分离器电池在0.5℃下500次循环后具有高达827.8 mah.g（-1）的放电容量。低容量衰落率，对称的循环伏安图和电极形态的保留均表明了抗原始等吸附方法可以成功抑制多硫化物穿梭效果，同时保持优异的电池性能。

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