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首页> 外文期刊>ACS Macro Letters >Conformal Polymeric Multilayer Coatings on Sulfur Cathodes via the Layer-by-Layer Deposition for High Capacity Retention in Li-S Batteries
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Conformal Polymeric Multilayer Coatings on Sulfur Cathodes via the Layer-by-Layer Deposition for High Capacity Retention in Li-S Batteries

机译:通过分层沉积在硫阴极上的共形聚合物多层涂层,可在Li-S电池中保持高容量

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摘要

We report on the conformal coating of thickness tunable multilayers directly onto the sulfur (S-8) cathodes by the layer-by-layer (LbL) deposition for the significant improvement in the performances of Li-S batteries even without key additives (LiNO3) in the electrolyte. Poly(ethylene oxide) (PEO)/poly(acrylic acid) (PAA) multilayers on a single poly(allylamine hydrochloride) (PAH)/PAA priming bilayer, deposited on the S-8 cathodes, effectively protected from the polysulfide leakage, while providing a Li+ ion diffusion channel. As a result, PAH/PAA/(PEO/PAA)(3) multilayer-coated cathodes exhibited the highest capacity retention (806 mAh g(-1)) after 100 cycles at 0.5 C, as well as the high C-rate capability up to 2.0 C. Furthermore, the multilayer coating effectively mitigated the polysulfide shuttle effect in the absent of LiNO3 additives in the electrolyte.
机译:我们报告了通过逐层(LbL)沉积将厚度可调多层的保形涂层直接涂在硫(S-8)阴极上的方法,即使没有关键添加剂(LiNO3)也能显着改善Li-S电池的性能在电解质中。沉积在S-8阴极上的单个聚(烯丙胺盐酸盐)(PAH)/ PAA底漆双层上的聚环氧乙烷(PEO)/聚丙烯酸(PAA)多层,有效地防止了多硫化物泄漏,同时提供一个Li +离子扩散通道。结果,PAH / PAA /(PEO / PAA)(3)多层涂覆的阴极在0.5 C循环100次后表现出最高的容量保持率(806 mAh g(-1)),以及高的C速率容量高达2.0C。此外,在电解质中不存在LiNO3添加剂的情况下,多层涂层可有效缓解多硫化物的穿梭效应。

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