Zinc metal batteries featuring high capacity, low cost, and environmental benignity have been receiving more attention than ever. Regrettably, due to the intrinsic thermodynamic instability of metallic zinc in conventional aqueous electrolytes, giant challenges still remain before its broad application. Herein, we report a corrosion-free zinc metal battery with an ultra-thin zinc anode and high depth of discharge by rational electrolyte engineering. This weakly coordinated aprotic electrolyte endows the metallic zinc with excellent thermodynamic stability in static storage by avoiding the generation of H⁺ and the zinc foil experienced no evident corrosion even after soaking for two weeks, which provides an important benchmark for employing an ultra-thin metallic zinc anode down to 10 μm-thick. Besides, benefiting from its distinctive weakly-coordinated solvation structure (i.e., [Zn(DMI)₃]²⁺ and [Zn(DMI)₄]²⁺), this electrolyte endows the zinc metal battery with superior electrochemical performance at a high depth of discharge. 10 μm Zn‖10 μm Zn symmetric cells stably cycled for 7220 hours at the current density of 1 mA cm⁻² and 10 μm Zn‖15.3 mg cm⁻² PANI full cells stably ran for 1700 cycles at the current density of 50 mA g⁻¹, exhibiting a high capacity retention of 82.5%. Lastly, we revealed that the superior dynamic performance of the aqueous electrolyte is attributed to the faster mass transfer in the electrolyte rather than a lower de-solvation energy in the electrode/electrolyte interphase. This work illustrates a potential pathway for the commercial application of zinc metal batteries.

中文翻译：

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一种具有超薄锌阳极和高放电深度的耐腐蚀锌金属电池

锌金属电池具有高容量、低成本、环境友好等特点，越来越受到人们的关注。遗憾的是，由于金属锌在传统水性电解质中固有的热力学不稳定性，在其广泛应用之前仍然存在巨大的挑战。在此，我们通过合理的电解质工程报道了一种具有超薄锌阳极和高放电深度的防腐蚀锌金属电池。这种弱配位的非质子电解质避免了H ⁺的产生，赋予了金属锌在静态存储中优异的热力学稳定性，并且锌箔即使在浸泡两周后也没有出现明显的腐蚀，这为使用超薄金属锌提供了重要的基准。锌阳极厚度降至 10 μm。此外，得益于其独特的弱配位溶剂化结构（即[Zn(DMI) ₃ ] ²⁺和[Zn(DMI) ₄ ] ²⁺ )，该电解液赋予锌金属电池在高深度下优异的电化学性能。放电。 10 μm Zn‖10 μm Zn对称电池在1 mA cm ^-2电流密度下稳定循环7220小时，10 μm Zn‖15.3 mg cm ^-2 PANI全电池在50 mA g-1电流密度下稳定循环1700次^-1，表现出82.5%的高容量保持率。最后，我们发现水性电解质的优异动态性能归因于电解质中更快的传质，而不是电极/电解质界面中较低的去溶剂化能。这项工作阐明了锌金属电池商业应用的潜在途径。