Electrochemical Polishing of Lithium Metal Surface for Highly Demanding Solid‐Electrolyte Interphase,ChemElectroChem

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Electrochemical Polishing of Lithium Metal Surface for Highly Demanding Solid‐Electrolyte Interphase
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-09-03 , DOI: 10.1002/celc.201800907
Yu Gu ₁ , Wei-Wei Wang ₁ , Jun-Wu He ₁ , Shuai Tang ₁ , Hong-Yu Xu ₁ , Jia-Wei Yan ₁ , Qi-Hui Wu ₂ , Xiao-Bing Lian ₃ , Ming-Sen Zheng ₁ , Quan-Feng Dong ₁ , Bing-Wei Mao ₁

Affiliation

Lithium metal has shown great promise as an anode material for high‐energy rechargeable batteries. However, interfacial instability caused by an unstable solid‐electrolyte interphase (SEI) and dendrite growth has impeded the realization of Li anodes for practical applications. Recently, we reported a potentiostatic stripping−galvanostatic plating electrochemical polishing method to simultaneously create atomically flat Li and a molecularly smooth SEI, leading to a near‐perfect Li anodes that exhibit much enhanced electrochemical performance. In this paper, key factors including anodic stripping potentials, cathodic plating current densities, and types of salt and solvent systems are further investigated in detail based on the understanding of electrode reactions taking place during polishing. In particular, the importance of considerations on the mutual constrains between electropolishing and SEI formation and, thus, the necessity of fine control of potential and/or current is elucidated, which serves as a general rule for the successful application of electrochemical polishing of Li as well as other metals that involve the formation of SEIs.

中文翻译：

锂金属表面的电化学抛光，用于高要求的固体电解质中间相

锂金属作为高能可充电电池的负极材料具有广阔的前景。然而，由不稳定的固体电解质界面（SEI）和枝晶生长引起的界面不稳定性阻碍了锂阳极在实际应用中的实现。最近，我们报道了一种恒电位剥离-恒电流电镀电化学抛光方法，可同时生成原子上平坦的Li和分子上光滑的SEI，从而使近乎完美的Li阳极表现出更高的电化学性能。在本文中，基于对抛光过程中发生的电极反应的了解，进一步详细研究了包括阳极剥离电位，阴极电镀电流密度以及盐和溶剂体系类型在内的关键因素。尤其是，

更新日期：2018-09-03

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