用于长寿命锂金属负极的柔性固态电解质中间相层。
A Flexible Solid Electrolyte Interphase Layer for Long-Life Lithium Metal Anodes.
机构信息
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China.
出版信息
Angew Chem Int Ed Engl. 2018 Feb 5;57(6):1505-1509. doi: 10.1002/anie.201710806. Epub 2018 Jan 3.
Lithium (Li) metal is a promising anode material for high-energy density batteries. However, the unstable and static solid electrolyte interphase (SEI) can be destroyed by the dynamic Li plating/stripping behavior on the Li anode surface, leading to side reactions and Li dendrites growth. Herein, we design a smart Li polyacrylic acid (LiPAA) SEI layer high elasticity to address the dynamic Li plating/stripping processes by self-adapting interface regulation, which is demonstrated by in situ AFM. With the high binding ability and excellent stability of the LiPAA polymer, the smart SEI can significantly reduce the side reactions and improve battery safety markedly. Stable cycling of 700 h is achieved in the LiPAA-Li/LiPAA-Li symmetrical cell. The innovative strategy of self-adapting SEI design is broadly applicable, providing opportunities for use in Li metal anodes.
锂（Li）金属是高能密度电池的一种很有前途的阳极材料。然而，在 Li 阳极表面的动态 Li 电镀/剥离行为下，不稳定且静态的固体电解质界面（SEI）可能会被破坏，导致副反应和 Li 枝晶生长。在此，我们设计了一种智能 Li 聚丙烯酸（LiPAA）SEI 层的高弹性，通过自适应界面调节来解决动态 Li 电镀/剥离过程，这通过原位 AFM 得到了证明。由于 LiPAA 聚合物具有高结合能力和优异的稳定性，智能 SEI 可以显著减少副反应并显著提高电池安全性。LiPAA-Li/LiPAA-Li 对称电池实现了 700 小时的稳定循环。这种自适应 SEI 设计的创新策略具有广泛的适用性，为 Li 金属阳极的应用提供了机会。
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