Simultaneously Inhibiting Lithium Dendrites Growth and Polysulfides Shuttle by a Flexible MOF‐Based Membrane in Li–S Batteries,Advanced Energy Materials

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Simultaneously Inhibiting Lithium Dendrites Growth and Polysulfides Shuttle by a Flexible MOF‐Based Membrane in Li–S Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-10-14 , DOI: 10.1002/aenm.201802130
Yibo He _{1,

2} , Zhi Chang _{1,

2} , Shichao Wu ₁ , Yu Qiao _{1,

2} , Songyan Bai ₁ , Kezhu Jiang ₃ , Ping He ₃ , Haoshen Zhou _{1,

2,

3}

Affiliation

Lithium–sulfur (Li–S) batteries are considered a promising candidate for next‐generation energy storage devices due to their ultrahigh theoretical energy density (≈2600 Wh kg⁻¹). However, the uncontrolled growth of Li dendrites and the adverse effect of polysulfide shuttling seriously hinder their practical applications. Herein, a metal organic framework based membrane (MOF@PVDF‐HFP) with good flexibility is designed and fabricated by a facial vacuum filtration strategy. The highly uniform pore sizes of MOF particles facilitate homogenous Li‐ion fluxes, fundamentally inhibiting the growth of Li dendrites and resulting in stable Li plating/striping even at a quite high current density (10 mA cm⁻²). In addition, owing to the narrow pore size window of MOF nanoparticles, the MOF@PVDF‐HFP membrane serves as an effective barrier for suppressing the polysulfide shuttle, realizing an ultralong cycle life Li–S coin cell with an ultralow capacity fading upon 2000 cycles (0.015% per cycle). Moreover, high specific capacity (1269 mA h g⁻¹) and excellent capacity retention (936 mA h g⁻¹ after 200 cycles) of a flexible Li–S pouch cell with a high sulfur loading (5.8 mg cm⁻²) demonstrate the potential of MOF@PVDF‐HFP membranes for the development of practical energy storage devices.

中文翻译：

通过基于MOF的柔性锂电池膜同时抑制锂树枝状晶体的生长和多硫化物的穿梭

锂硫（Li–S）电池由于其极高的理论能量密度（≈2600Wh kg ^-1），被认为是下一代储能设备的有希望的候选者。然而，Li树枝状晶体的不受控制的生长和多硫化物穿梭的不利影响严重阻碍了它们的实际应用。在此，通过面部真空过滤策略设计和制造了具有良好柔韧性的基于金属有机骨架的膜（MOF @ PVDF-HFP）。MOF颗粒的高度均匀的孔径有利于均匀的Li-离子通量，从根本上抑制了Li树枝状晶体的生长，即使在相当高的电流密度（10 mA cm ^-2）下也可以实现稳定的Li镀/剥离）。此外，由于MOF纳米颗粒的孔径窗口狭窄，MOF @ PVDF-HFP膜可作为抑制多硫化物穿梭的有效屏障，实现了超长寿命的Li-S纽扣电池，在2000次循环后容量超低（每个周期0.015％）。此外，具有高硫载量（5.8 mg cm ^-2）的柔性Li-S袋式电池具有较高的比容量（1269 mA hg ^-1）和出色的容量保持率（200个循环后为936 mA hg ^-1），显示了MOF @ PVDF-HFP膜用于开发实用的能量存储设备。

更新日期：2018-10-14

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