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3D Artificial Solid‐Electrolyte Interphase for Lithium Metal Anodes Enabled by Insulator–Metal–Insulator Layered Heterostructures
Advanced Materials ( IF 27.4 ) Pub Date : 2021-02-25 , DOI: 10.1002/adma.202006247 Pengbo Zhai 1 , Tianshuai Wang 1 , Huaning Jiang 1 , Jiayu Wan 2 , Yi Wei 3 , Lei Wang 1 , Wei Liu 1 , Qian Chen 1 , Weiwei Yang 1 , Yi Cui 2, 4 , Yongji Gong 1
Advanced Materials ( IF 27.4 ) Pub Date : 2021-02-25 , DOI: 10.1002/adma.202006247 Pengbo Zhai 1 , Tianshuai Wang 1 , Huaning Jiang 1 , Jiayu Wan 2 , Yi Wei 3 , Lei Wang 1 , Wei Liu 1 , Qian Chen 1 , Weiwei Yang 1 , Yi Cui 2, 4 , Yongji Gong 1
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Despite considerable efforts to prevent lithium (Li) dendrite growth, stable cycling of Li metal anodes with various structures remains extremely difficult due to the direct contact of the liquid electrolyte with Li. Rational design of solid‐electrolyte interphase (SEI) for 3D electrodes is a promising but still challenging strategy for preventing Li dendrite growth and avoiding lithium–electrolyte side reactions in Li‐metal batteries. Here, a 3D architecture is constructed with g‐C3N4/graphene/g‐C3N4 insulator–metal–insulator sandwiched nanosheets to guide uniform Li plating/stripping in the van der Waals gap between the graphene and the g‐C3N4, and the function of which can be regarded as a 3D artificial SEI. Li deposition on the surface of g‐C3N4 is suppressed due to its insulating nature. However, its uniform lithiophilic sites and nanopore channels enable homogeneous lithium plating between the graphene and the g‐C3N4, prohibiting the direct contact of the electrolyte with the Li metal. The use of the g‐C3N4‐layer‐modified 3D anode enables long‐term Li deposition with a high Coulombic efficiency and stable cycling of full cells under high cathode loading, limited Li excess, and lean electrolyte conditions. The concept of a 3D artificial SEI will shed light on developing safe and stable Li‐metal anodes.
中文翻译：
绝缘体-金属-绝缘体分层异质结构实现的锂金属阳极的3D人工电解质界面
尽管为防止锂（Li）枝晶生长做出了巨大努力，但是由于液体电解质与Li的直接接触，具有各种结构的Li金属阳极的稳定循环仍然非常困难。合理设计3D电极的固体电解质中间相（SEI）是防止Li树枝状晶体生长并避免锂金属电池中锂电解质副反应的有前途但仍具挑战性的策略。在这里，使用g‐C 3 N 4 /石墨烯/ g‐C 3 N 4绝缘体-金属-绝缘体夹心纳米片构建3D架构，以引导石墨烯与g‐G之间的范德华间隙中均匀的Li镀层/剥离C 3 N 4，并且其功能可以视为3D人工SEI。由于其绝缘性，可抑制在g-C 3 N 4表面上的锂沉积。但是，其均匀的亲硫位点和纳米孔通道使石墨烯和g-C 3 N 4之间的锂镀层均匀，从而阻止了电解质与Li金属的直接接触。g-C 3 N 4层修饰的3D阳极的使用可实现长期的Li沉积，具有高的库仑效率，并且在高阴极负载，有限的Li过量和稀薄的电解质条件下，整个电池具有稳定的循环。3D人工SEI的概念将为开发安全稳定的锂金属阳极提供参考。
更新日期：2021-04-01
中文翻译：
绝缘体-金属-绝缘体分层异质结构实现的锂金属阳极的3D人工电解质界面
尽管为防止锂（Li）枝晶生长做出了巨大努力，但是由于液体电解质与Li的直接接触，具有各种结构的Li金属阳极的稳定循环仍然非常困难。合理设计3D电极的固体电解质中间相（SEI）是防止Li树枝状晶体生长并避免锂金属电池中锂电解质副反应的有前途但仍具挑战性的策略。在这里，使用g‐C 3 N 4 /石墨烯/ g‐C 3 N 4绝缘体-金属-绝缘体夹心纳米片构建3D架构，以引导石墨烯与g‐G之间的范德华间隙中均匀的Li镀层/剥离C 3 N 4，并且其功能可以视为3D人工SEI。由于其绝缘性，可抑制在g-C 3 N 4表面上的锂沉积。但是，其均匀的亲硫位点和纳米孔通道使石墨烯和g-C 3 N 4之间的锂镀层均匀，从而阻止了电解质与Li金属的直接接触。g-C 3 N 4层修饰的3D阳极的使用可实现长期的Li沉积，具有高的库仑效率，并且在高阴极负载，有限的Li过量和稀薄的电解质条件下，整个电池具有稳定的循环。3D人工SEI的概念将为开发安全稳定的锂金属阳极提供参考。
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