Micro-Patterned Lithium Metal Anodes with Suppressed Dendrite Formation for Post Lithium-Ion Batteries
Micro-Patterned Lithium Metal Anodes with Suppressed Dendrite Formation for Post Lithium-Ion Batteries
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DOI：
10.1002/admi.201600140
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发表时间：
2016-06-06
影响因子：
5.4
通讯作者：
Lee, Yong Min
中科院分区：
文献类型：
--
作者：
Park, Joonam;Jeong, Jiseon;Lee, Yong Min
抑制不受控制的锂（Li）枝晶生长是使Li金属二次电池能够可靠使用的首要任务。另一方面，在金属镀覆期间控制金属镀覆行为的技术确实被认为是非常难以实现的。例如，在电镀过程中，如何将金属离子镀在所选择的有利区域上？本研究描述了如何实现这一目标，即，无枝晶Li沉积，通过使用简单的冲压技术的机械表面改性，其中使用COMSOL Multiphysics的有限元法模拟用于设计印模的微图案。在冲压之后，Li金属阳极上的转移的微图案在重复的Li沉积/剥离工艺期间抑制枝晶生长，并且表现出Li金属阳极的改善的长期循环稳定性。在重复的Li电镀工艺期间，图案孔被Li金属的液体状和/或颗粒状形式填充，而不会导致Li枝晶生长。然后，这些孔在Li剥离过程中可逆地排出，恢复到其原始尺寸。本研究调查了这种独特的锂电镀/剥离行为作为电流密度的函数的相关性。
Repressing uncontrolled lithium (Li) dendrite growth is the top priority for enabling the reliable use of Li metal secondary batteries. On the other hand, the technique controlling the metal plating behavior during metal plating indeed has been considered very difficult to achieve. For instance, how can one plate metal ions on the favored selected region during plating? The present study describes how to achieve this goal, i.e., dendrite-free Li deposition, by mechanical surface modification using a simple stamping technique, where finite-element method simulation using COMSOL Multiphysics was used to design the micro-patterns of the stamp. After stamping, the transferred micro-patterns on Li metal anodes suppress dendrite growth during repeated Li deposition/stripping processes and exhibit improved long-term cycling stability of Li metal anodes. During the repeated Li plating processes, the pattern holes are filled by the liquid-like and/or granular forms of Li metal without resulting Li dendrite growth. These holes are then reversibly drained during the Li stripping process, reverting to their original dimension. This study investigated the correlation of this unique Li plating/stripping behavior as a function of the current density.