材料科学
分离器(采油)
磺酸盐
化学工程
冶金
热力学
物理
工程类
钠
作者
Jie Xu,Shuhao An,Xianyu Song,Yongjie Cao,Nan Wang,Xuan Qiu,Yu Zhang,Jiawei Chen,Xianli Duan,Jianhang Huang,Wei Li,Yonggang Wang
标识
DOI:10.1002/adma.202105178
摘要
Lithium-sulfur (Li-S) batteries are held great promise for next-generation high-energy-density devices; however, polysulfide shuttle and Li-dendrite growth severely hinders their commercial production. Herein, a sulfonate-rich COF (SCOF-2) is designed, synthesized, and used to modify the separator of Li-S batteries, providing a solution for the above challenges. It is found that the SCOF-2 features stronger electronegativity and larger interlayer spacing than that of none/monosulfonate COFs, which can facilitate the Li+ migration and alleviate the formation of Li-dendrites. Density functional theory (DFT) calculations and in situ Raman analysis demonstrate that the SCOF-2 possesses a narrow bandgap and strong interaction on sulfur species, thereby suppressing self-discharge behavior. As a result, the modified batteries deliver an ultralow attenuation rate of 0.047% per cycle over 800 cycles at 1 C, and excellent anti-self-discharge performance by a low-capacity attenuation of 6.0% over one week. Additionally, even with the high-sulfur-loading cathode (3.2-8.2 mgs cm-2 ) and lean electrolyte (5 µL mgs-1 ), the batteries still exhibit ≈80% capacity retention over 100 cycles, showing great potential for practical application.
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