Bottom-Up Lithium Growth Triggered by Interfacial Activity Gradient on Porous Framework for Lithium-Metal Anode,ACS Energy Letters

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Bottom-Up Lithium Growth Triggered by Interfacial Activity Gradient on Porous Framework for Lithium-Metal Anode
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-09-01 , DOI: 10.1021/acsenergylett.0c01619
Jonghyeok Yun ₁ , Beom-Kyeong Park ₂ , Eun-Seo Won ₃ , Seung Hyun Choi ₄ , Hyon Chol Kang ₁ , Jung Ho Kim ₅ , Min-Sik Park ₄ , Jong-Won Lee ₃

Affiliation

Three-dimensional (3D) porous frameworks have attracted considerable interest as lithium-metal electrodes for next-generation rechargeable batteries. The high surface areas and large pore volumes of 3D frameworks are beneficial for reducing local current densities and suppressing volume changes. However, uneven Li plating on top of the framework electrode (top growth) has yet to be resolved. To enable the bottom-up Li growth while suppressing the top growth, herein, we propose a rational design of 3D framework electrodes with an interfacial activity gradient (IAG) based on a kinetics-based mechanistic analysis. A simulation demonstrates that an IAG design promotes the bottom-up Li growth, which is experimentally proven using model architectures. The IAG-Cu framework shows considerable improvements in morphological stability and reversibility during high-capacity Li storage, compared to the Cu framework with a uniform interfacial activity. This work provides fundamental insight into the design of 3D frameworks to boost the cycling stability of Li-metal batteries.

中文翻译：

锂金属阳极多孔结构上界面活性梯度触发自下而上的锂生长

作为下一代可充电电池的锂金属电极，三维（3D）多孔框架引起了人们的极大兴趣。3D框架的高表面积和大孔体积有利于降低局部电流密度并抑制体积变化。但是，框架电极顶部的锂镀层不均匀（顶部生长）尚未解决。为了在不抑制顶部生长的情况下实现自底向上的Li生长，我们在基于动力学的力学分析基础上，提出了具有界面活性梯度（IAG）的3D框架电极的合理设计。仿真表明，IAG设计促进了自下而上的Li的生长，这已通过模型体系结构进行了实验验证。与具有均匀界面活性的Cu框架相比，IAG-Cu框架在高容量锂存储过程中显示出形态稳定性和可逆性方面的显着改善。这项工作为3D框架的设计提供了基本的见识，以提高锂金属电池的循环稳定性。

更新日期：2020-10-11

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