碳酸酯類電解液成分與表面改質應用於鋰金屬負極的研究

鋰金屬負極被認為是高能量鋰離子電池最具潛力的材料之一。然而，鋰枝晶生長可能導致短路和低庫侖效率(CE)是目前鋰金屬負極技術實際應用的關鍵挑戰。目前全世界研究已經提出了各種策略來抑制鋰枝晶形成。但為了解鋰枝晶形成和抑制行為，以及如何提高其電化學表現，本文對溶劑和表面塗層對鋰金屬負極電化學行為的影響進行了廣泛的研究。具有／不具有添加劑的各種組分的碳酸酯電解液用於在鋰負極上進行鋰電鍍和剝離。並嘗試將目前鋰金屬負極研究的兩大主軸結合，測試了銅箔上的人工固態界面塗層對鋰沉積形態的影響。結合臨場光學顯微鏡觀察、電顯鏡表面型態分析，及電化學分析，以揭示個因素之潛在機制。

關鍵字

鋰金屬負極；人工固態介面；碳酸酯類電解液；鋰枝晶

並列摘要

Li metal anode is strongly considered to be one of the most promising candidates for high-energy Li-ion batteries. However, lithium dendrite growth, which could cause short-circuit, and low Coulombic efficiency (CE) are the key issues for realizing practical applications of Li anode technologies. Various strategies have been proposed to suppress Li dendrite formation. In order to understand the Li dendrite formation and CE behaviors, we carried out extensive study on the effects of solvent and surface coating on the electrochemical behaviors of the Li metal anodes. Carbonate solvents having various components with/without additives have been employed for Li plating and stripping on Cu substrate. Polymeric coatings on Cu have also been tested for their effects on the morphology of Li deposition. In particular, extensive real-time optical microscopy imaging and post mortem SEM analyses are carried out in conjunction with electrochemical characterizations to reveal the underlying mechanisms for the resulting effects.

並列關鍵字

Lithium metal anode ； Artificial SEI ； Carbonate-based electrolyte ； Lithium dendrite

國際替代計量

碳酸酯類電解液成分與表面改質應用於鋰金屬負極的研究

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