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Shielding Polysulfide Intermediates by an Organosulfur-Containing Solid Electrolyte Interphase on the Lithium Anode in Lithium-Sulfur Batteries.
Advanced Materials ( IF 29.4 ) Pub Date : 2020-08-06 , DOI: 10.1002/adma.202003012
Jun-Yu Wei 1, 2 , Xue-Qiang Zhang 3 , Li-Peng Hou 3 , Peng Shi 3 , Bo-Quan Li 2, 3 , Ye Xiao 1, 2 , Chong Yan 1, 2 , Hong Yuan 1, 2 , Jia-Qi Huang 1, 2
Affiliation  

The lithium–sulfur (Li–S) battery is regarded as a promising high‐energy‐density battery system, in which the dissolution–precipitation redox reactions of the S cathode are critical. However, soluble Li polysulfides (LiPSs), as the indispensable intermediates, easily diffuse to the Li anode and react with the Li metal severely, thus depleting the active materials and inducing the rapid failure of the battery, especially under practical conditions. Herein, an organosulfur‐containing solid electrolyte interphase (SEI) is tailored for the stabilizaiton of the Li anode in Li–S batteries by employing 3,5‐bis(trifluoromethyl)thiophenol as an electrolyte additive. The organosulfur‐containing SEI protects the Li anode from the detrimental reactions with LiPSs and decreases its corrosion. Under practical conditions with a high‐loading S cathode (4.5 mgS cm−2), a low electrolyte/S ratio (5.0 µL mgS−1), and an ultrathin Li anode (50 µm), a Li–S battery delivers 82 cycles with an organosulfur‐containing SEI in comparison to 42 cycles with a routine SEI. This work provokes the vital insights into the role of the organic components of SEI in the protection of the Li anode in practical Li–S batteries.

中文翻译:

通过锂硫电池中锂阳极上的含有机硫固体电解质中间相屏蔽多硫化物中间体。

锂硫(Li–S)电池被认为是一种很有前途的高能量密度电池系统,其中S阴极的溶解-沉淀氧化还原反应至关重要。然而,作为必不可少的中间体的可溶性锂多硫化物(LiPS)容易扩散到Li阳极并与Li金属发生剧烈反应,从而耗尽了活性材料并引起电池的快速失效,特别是在实际条件下。在此,通过使用3,5-双(三氟甲基)硫酚作为电解质添加剂,为稳定Li-S电池中的Li阳极量身定制了一种含有机硫的固体电解质中间相(SEI)。含有机硫的SEI保护Li阳极免受与LiPSs的有害反应并降低其腐蚀。在实际条件下使用高负荷S阴极(4.5 mgS cm -2),低的电解质/ S比(5.0 µL mg S -1)和超薄的Li阳极(50 µm),Li–S电池使用含有机硫的SEI进行了82次循环,而42次循环使用常规的SEI。这项工作激发了对SEI有机成分在实际Li-S电池中保护Li阳极的作用的重要见解。
更新日期:2020-09-15
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