多硫化物
氧化还原
电化学
阴极
硫黄
化学
电池(电)
法拉第效率
储能
锂(药物)
润湿
无机化学
碳纤维
锂硫电池
化学工程
材料科学
电极
电解质
有机化学
医学
物理化学
工程类
内分泌学
功率(物理)
物理
量子力学
复合材料
复合数
作者
Qin Luo,Ming Zhang,Jin Ming Liu,Zhi Wei Li,Ying Hu,Yan Yin,Xian Bin Liu,Ye Sheng Li,Zi Ping Wu
标识
DOI:10.1016/j.electacta.2022.140178
摘要
Lithium-sulfur (Li-S) batteries are promising next-generation energy storage systems. However, low active material utilization and sluggish reaction kinetics restrict their practical applications. Here, the redox reaction of these batteries was visualized, and their polysulfide component was established with their ultraviolet-visible absorption spectra through in-situ discharge observations. Liquid polysulfides with controllable component and concentration can be obtained by discharging solid sulfur into a determined potential. Fast and timely electrochemical conversion kinetics will occur due to the excellent wettability between polysulfides and carbon nanotube sponges (CNSs). In addition, the robust chemical interaction between liquid polysulfides and oxygen-containing groups inhibit the shuttle effect to a certain extent. Accordingly, the polysulfides-CNSs cathode demonstrates high sulfur utilization that exceeds 60% after 200 cycles. The obtained Li-S battery exhibits remarkably long cycling stability for 1500 cycles at 1 C with nearly 100% coulombic efficiency. This work provides valuable concepts for fabricating cathodes for Li-S batteries and for achieving their high-level services.
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