Although the Li-metal anode holds the key to overcoming the bottleneck of current Li-ion rechargeable batteries, the trade-off between safety and practicality, especially at high current densities, is a major barrier because of the formation of hazardous Li dendrites arising from inhomogeneous Li electrodeposition. Herein we demonstrate the feasibility of achieving homogeneous Li electrodeposition by implementing porous metal-organic framework (MOF) species in pristine liquid electrolyte. The MOF host provides considerable natural angstrom-level pores that preferentially control the migration of large-sized anions. Consequently, the “caged” electrolyte anions facilitate a homogeneous Li-ion flux, which illustrates a stable Li-metal plating/stripping at a practically high current density (10 mA cm⁻²). As a proof of concept, the high areal-loading Li-Li₄Ti₅O₁₂ batteries (∼10 mg cm⁻²) with the MOF-modified electrolyte deliver excellent long-life cycling at high current densities (∼7 mA cm⁻²). Our results underline the great potential of MOFs in tuning the electrolyte properties to achieve desirable Li-metal battery performance.

尽管锂金属阳极是克服当前锂离子充电电池瓶颈的关键，但安全性和实用性之间的权衡（尤其是在高电流密度下）是主要障碍，因为会形成有害的锂树枝状晶体。锂电沉积不均匀。在这里，我们证明了通过在原始液体电解质中实施多孔金属有机骨架（MOF）物种来实现均匀Li电沉积的可行性。MOF主体提供了可观的天然埃级孔，可优先控制大尺寸阴离子的迁移。因此，“笼状”电解质阴离子促进了均匀的锂离子通量，这说明了在实际高电流密度（10 mA cm ^-2）下稳定的锂金属镀覆/剥离）。作为概念验证，在高的面加载力力₄的Ti ₅ ø _12个电池（〜10毫克厘米^-2）与MOF改性电解质在高电流密度（~7毫安厘米提供优异的长寿命的循环^{- 2}）。我们的研究结果突显了MOF在调节电解质性能以实现理想的锂金属电池性能方面的巨大潜力。