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An Anionic‐MOF‐Based Bifunctional Separator for Regulating Lithium Deposition and Suppressing Polysulfides Shuttle in Li–S Batteries
Small Methods ( IF 10.7 ) Pub Date : 2020-04-15 , DOI: 10.1002/smtd.202000082 Ziqi Wang 1 , Weiyuan Huang 2 , Jiachuan Hua 1 , Yidi Wang 1 , Haocong Yi 2 , Wenguang Zhao 2 , Qinghe Zhao 2 , Hao Jia 1 , Bin Fei 1 , Feng Pan 2
Small Methods ( IF 10.7 ) Pub Date : 2020-04-15 , DOI: 10.1002/smtd.202000082 Ziqi Wang 1 , Weiyuan Huang 2 , Jiachuan Hua 1 , Yidi Wang 1 , Haocong Yi 2 , Wenguang Zhao 2 , Qinghe Zhao 2 , Hao Jia 1 , Bin Fei 1 , Feng Pan 2
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Lithium–sulfur (Li–S) batteries have been regarded as a promising energy‐storage system owing to their high theoretical energy density of 2600 Wh kg−1 and low cost of raw materials. However, the dendrite issue of Li metal anodes and the shuttle effect of polysulfides severely plague the safety and cycling stability of Li–S batteries. To address these problems, a novel nanoporous battery separator (MMMS) is designed based on an anionic metal–organic framework (MOF) UiO‐66‐SO3Li and poly(vinylidene fluoride) (PVDF) following a mixed‐matrix membrane approach. Benefitting from the well‐defined anionic Li+ transport tunnels across the MMMS, a homogeneous Li deposition is achieved to stabilize the plating/stripping cycling over 1000 h at a high current density of 5 mA cm−2. Moreover, these tunnels featuring anionic electrostatic repulsion and a proper aperture size also demonstrate strong suppression to polysulfide shuttle and promote the redox activity and utilization of sulfur cathode material. With the MMMS to simultaneously promote the performance of Li metal anode and sulfur cathode, the Li–S battery delivers an elevated charge/discharge rate up to 5 C (552 mAh g−1) as well as a low capacity fading (0.056% per cycle at its steady stage) over 500 cycles at 0.5 C.
中文翻译：
基于阴离子-MOF的双功能隔板，用于调节锂电池中的锂沉积并抑制多硫化物穿梭机
锂硫（Li–S）电池由于其2600 Wh kg -1的高理论能量密度和较低的原材料成本而被认为是一种有前途的储能系统。但是，锂金属阳极的枝晶问题和多硫化物的穿梭效应严重困扰着锂锂电池的安全性和循环稳定性。为了解决这些问题，在混合基质膜方法的基础上，设计了一种基于阴离子金属-有机骨架（MOF）UiO-66-SO 3 Li和聚偏二氟乙烯（PVDF）的新型纳米多孔电池隔板（MMMS）。受益于定义明确的阴离子Li +通过MMMS上的隧道传输，在5 mA cm -2的高电流密度下，均匀的Li沉积可稳定1000 h内的电镀/剥离循环。此外，这些具有阴离子静电排斥力和适当孔径的通道还显示出对多硫化物梭的强烈抑制作用，并促进了氧化还原活性和硫阴极材料的利用。借助MMMS同时提高锂金属阳极和硫磺阴极的性能，Li–S电池可提供高达5 C（552 mAh g -1）的高充电/放电速率以及低容量褪色（每英寸0.056％）在0.5 C下超过500个循环。
更新日期：2020-04-15
中文翻译：
基于阴离子-MOF的双功能隔板，用于调节锂电池中的锂沉积并抑制多硫化物穿梭机
锂硫（Li–S）电池由于其2600 Wh kg -1的高理论能量密度和较低的原材料成本而被认为是一种有前途的储能系统。但是，锂金属阳极的枝晶问题和多硫化物的穿梭效应严重困扰着锂锂电池的安全性和循环稳定性。为了解决这些问题，在混合基质膜方法的基础上，设计了一种基于阴离子金属-有机骨架（MOF）UiO-66-SO 3 Li和聚偏二氟乙烯（PVDF）的新型纳米多孔电池隔板（MMMS）。受益于定义明确的阴离子Li +通过MMMS上的隧道传输，在5 mA cm -2的高电流密度下，均匀的Li沉积可稳定1000 h内的电镀/剥离循环。此外，这些具有阴离子静电排斥力和适当孔径的通道还显示出对多硫化物梭的强烈抑制作用，并促进了氧化还原活性和硫阴极材料的利用。借助MMMS同时提高锂金属阳极和硫磺阴极的性能，Li–S电池可提供高达5 C（552 mAh g -1）的高充电/放电速率以及低容量褪色（每英寸0.056％）在0.5 C下超过500个循环。
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