Kim Eui Tae, Park Jungjin, Kim Chunjoong, Simmonds Adam G, Sung Yung-Eun, Pyun Jeffrey, Char Kookheon
Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Korea.
Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States.
ACS Macro Lett. 2016 Apr 19;5(4):471-475. doi: 10.1021/acsmacrolett.6b00144. Epub 2016 Mar 23.
We report on the conformal coating of thickness-tunable multilayers directly onto the sulfur (S) cathodes by the layer-by-layer (LbL) deposition for the significant improvement in the performances of Li-S batteries even without key additives (LiNO) 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 cathodes, effectively protected from the polysulfide leakage, while providing a Li ion diffusion channel. As a result, PAH/PAA/(PEO/PAA) multilayer-coated cathodes exhibited the highest capacity retention (806 mAh g) 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 LiNO additives in the electrolyte.
我们报道了通过逐层（LbL）沉积将厚度可调的多层膜直接 conformal 涂覆在硫（S）阴极上，即使在电解液中没有关键添加剂（LiNO）的情况下，锂硫电池的性能也能得到显著改善。沉积在 S 阴极上的单个聚（烯丙胺盐酸盐）（PAH）/聚丙烯酸（PAA）预涂双层上的聚（环氧乙烷）（PEO）/聚丙烯酸（PAA）多层膜有效地防止了多硫化物泄漏，同时提供了锂离子扩散通道。结果，PAH/PAA/（PEO/PAA）多层膜涂覆的阴极在 0.5 C 下循环 100 次后表现出最高的容量保持率（806 mAh g），以及高达 2.0 C 的高倍率性能。此外，多层膜涂层在电解液中没有 LiNO 添加剂的情况下有效地减轻了多硫化物穿梭效应。
