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Balancing the Seesaw: Investigation of a Separator to Grasp Polysulfides with Diatomic Chemisorption.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-26 , DOI: 10.1021/acsami.0c04554 Qin Dong 1 , Tao Wang 1 , Ruiyi Gan 1 , Na Fu 1 , Cunpu Li 1 , Zidong Wei 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-26 , DOI: 10.1021/acsami.0c04554 Qin Dong 1 , Tao Wang 1 , Ruiyi Gan 1 , Na Fu 1 , Cunpu Li 1 , Zidong Wei 1
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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.
中文翻译：
平衡跷跷板：研究分离器以双原子化学吸附来掌握多硫化物。
锂硫（Li-S）电池具有高理论比容量，环境兼容性和低成本的优点，因此有望成为下一代高密度储能系统。然而，高阶多硫化物溶解在电解质中并随后导致不期望的多硫化物穿梭效应，这阻碍了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了商用聚丙烯隔膜上。进行密度泛函理论（DFT）计算，结果表明吗啉侧链可以同等可逆地抓住所有高阶多硫化物。这种双原子化学吸附调节了硫相关化合物之间的转化过程。改进的隔膜电池的放电容量高达827。
更新日期：2020-04-13
中文翻译：
平衡跷跷板：研究分离器以双原子化学吸附来掌握多硫化物。
锂硫（Li-S）电池具有高理论比容量，环境兼容性和低成本的优点，因此有望成为下一代高密度储能系统。然而，高阶多硫化物溶解在电解质中并随后导致不期望的多硫化物穿梭效应，这阻碍了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了商用聚丙烯隔膜上。进行密度泛函理论（DFT）计算，结果表明吗啉侧链可以同等可逆地抓住所有高阶多硫化物。这种双原子化学吸附调节了硫相关化合物之间的转化过程。改进的隔膜电池的放电容量高达827。
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