A Novel Organic “Polyurea” Thin Film for Ultralong‐Life Lithium‐Metal Anodes via Molecular‐Layer Deposition,Advanced Materials

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A Novel Organic “Polyurea” Thin Film for Ultralong‐Life Lithium‐Metal Anodes via Molecular‐Layer Deposition
Advanced Materials ( IF 27.4 ) Pub Date : 2018-12-05 , DOI: 10.1002/adma.201806541
Yipeng Sun ₁ , Yang Zhao ₁ , Jiwei Wang ₂ , Jianneng Liang ₁ , Changhong Wang ₁ , Qian Sun ₁ , Xiaoting Lin ₁ , Keegan R. Adair ₁ , Jing Luo ₁ , Dawei Wang ₁ , Ruying Li ₁ , Mei Cai ₃ , Tsun-Kong Sham ₂ , Xueliang Sun ₁

Affiliation

Metallic Li is considered as one of the most promising anode materials for next‐generation batteries due to its high theoretical capacity and low electrochemical potential. However, its commercialization has been impeded by the severe safety issues associated with Li‐dendrite growth. Non‐uniform Li‐ion flux on the Li‐metal surface and the formation of unstable solid electrolyte interphase (SEI) during the Li plating/stripping process lead to the growth of dendritic and mossy Li structures that deteriorate the cycling performance and can cause short‐circuits. Herein, an ultrathin polymer film of “polyurea” as an artificial SEI layer for Li‐metal anodes via molecular‐layer deposition (MLD) is reported. Abundant polar groups in polyurea can redistribute the Li‐ion flux and lead to a uniform plating/stripping process. As a result, the dendritic Li growth during cycling is efficiently suppressed and the life span is significantly prolonged (three times longer than bare Li at a current density of 3 mA cm⁻²). Moreover, the detailed surface and interfacial chemistry of Li metal are studied comprehensively. This work provides deep insights into the design of artificial SEI coatings for Li metal and progress toward realizing next‐generation Li‐metal batteries.

中文翻译：

通过分子层沉积用于超长寿命锂金属阳极的新型有机“聚脲”薄膜

金属锂由于其高理论容量和低电化学势而被认为是下一代电池最有希望的负极材料之一。但是，其商业化受到了与锂枝晶生长相关的严重安全问题的阻碍。锂金属表面上不均匀的锂离子通量以及在锂电镀/剥离过程中形成不稳定的固体电解质中间相（SEI）会导致树枝状和苔藓状的锂结构的生长，从而恶化循环性能并可能导致短路电路。本文报道了一种超薄聚合物膜“聚脲”，它是通过分子层沉积（MLD）作为锂金属阳极的人造SEI层。聚脲中大量的极性基团可以重新分配锂离子流量，并导致均匀的电镀/剥离过程。因此，^-2）。此外，还对锂金属的详细表面和界面化学进行了综合研究。这项工作为锂金属人造SEI涂层的设计和实现下一代锂金属电池的进展提供了深刻的见解。

更新日期：2018-12-05

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