3D Porous Cu Current Collector/Li‐Metal Composite Anode for Stable Lithium‐Metal Batteries,Advanced Functional Materials

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3D Porous Cu Current Collector/Li‐Metal Composite Anode for Stable Lithium‐Metal Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-03-21 , DOI: 10.1002/adfm.201606422
Qi Li ₁ , Shoupu Zhu ₁ , Yingying Lu ₁

Affiliation

Lithium‐metal batteries are of particular interest for next‐generation electrical energy storage because of their high energy density on both volumetric and gravimetric bases. Effective strategies to stabilize the Li‐metal anode are the prerequisite for the progress of these exceptional storage technologies, such as Li–S and Li–O₂ batteries. Various challenges, such as uneven Li electrodeposition, anode volume expansion, and dendrite‐induced short‐circuit have hindered the practical application of rechargeable Li‐metal batteries. Herein, a one‐step facile and cost‐effective strategy for stabilizing lithium‐metal batteries via 3D porous Cu current collector/Li‐metal composite anode is reported. The porous structure of the composite electrode provides a “cage” for the redeposition of “hostless” lithium and accommodates the anode volume expansion during cycling. Compared with planar Cu foil, its high specific surface area favors the electrochemical reaction kinetics and lowers the local current density along the anode. It leads to low interfacial resistance and stabilizes the Li electrodeposition. On this basis, galvanostatic measurements are performed on both symmetric cells and Li/Li₄Ti₅O₁₂ cells and it is found that the electrodes exhibit exceptional abilities of promoting cell lifetime and stabilizing the cycling behavior. Although this work focuses on lithium metal, this novel tactic is easy to generalize to other metal electrodes.

中文翻译：

用于稳定锂金属电池的3D多孔Cu集电器/锂金属复合阳极

金属锂电池特别受下一代电能存储的关注，因为它们的体积和重量基准都具有很高的能量密度。稳定锂金属阳极的有效策略是这些出色的存储技术（如Li–S和Li–O _2）取得进步的先决条件电池。锂电沉积不均匀，阳极体积膨胀以及枝晶引起的短路等各种挑战阻碍了可充电锂金属电池的实际应用。本文报道了一种通过3D多孔铜集流体/锂金属复合阳极稳定锂金属电池的一步可行且经济高效的策略。复合电极的多孔结构为“无基质”锂的再沉积提供了一个“笼”，并适应了循环过程中阳极的体积膨胀。与平面铜箔相比，其高比表面积有利于电化学反应动力学并降低沿阳极的局部电流密度。这导致低的界面电阻并稳定了Li的电沉积。在此基础上，₄ Ti ₅ O ₁₂电池，发现电极表现出优异的能力，可以延长电池寿命并稳定循环行为。尽管这项工作集中在锂金属上，但是这种新颖的策略很容易推广到其他金属电极。

更新日期：2017-03-21

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