Guided Lithium Deposition by Surface Micro‐Patterning of Lithium‐Metal Electrodes,ChemElectroChem

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Guided Lithium Deposition by Surface Micro‐Patterning of Lithium‐Metal Electrodes
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-08-24 , DOI: 10.1002/celc.201800694
Yun-Jung Kim ₁ , Hyun S. Jin ₁ , Dong-Hyun Lee ₁ , Jaeho Choi ₁ , Wonhee Jo ₁ , Hyungjun Noh ₁ , Jinhong Lee ₁ , Hyunwon Chu ₁ , Hobeom Kwack ₁ , Fangmin Ye _{1,

2} , Hongkyung Lee ₃ , Myung-Hyun Ryou ₄ , Hee-Tak Kim _{1,

2}

Affiliation

Uncontrolled lithium (Li) deposition has hampered the evolution of Li‐metal electrode‐based Li‐batteries. In this work, we report the differences of a guided Li deposition with a size change of the square hole micro‐patterns carved on the Li‐metal surface with two different dimensions using a simple stamping method. Li deposition is preferentially initiated on the top edge for the smaller pattern and on the bottom for the larger pattern. Although the two patterns lead to a more uniform utilization of the Li, the larger pattern shows a higher cycling stability within a LiFePO₄/Li cell than that of the smaller one indicating that initiating the Li deposition from the bottom of the hole is more efficient in confining the deposited Li. Based on the impedance analysis of the compressed Li electrodes, we suggest that the guided Li deposition on the bottom of the hole is attributed to a large contrast in the resistance of native surface passivation layer between the top and hole surfaces. This improved understanding can further advance guided Li deposition induced by surface patterns for high performance Li‐metal batteries.

中文翻译：

锂金属电极表面微晶制导的锂沉积

不受控制的锂（Li）沉积阻碍了基于锂金属电极的锂电池的发展。在这项工作中，我们报告了使用简单的冲压方法，在两个不同尺寸的锂金属表面上刻出的方孔微图案尺寸变化的情况下，引导的锂沉积的差异。对于较小的图案，优选在顶部边缘上开始沉积锂，对于较大的图案，优选在底部上开始沉积锂。尽管这两种模式导致Li的利用率更加均匀，但是较大的模式显示出LiFePO ₄内更高的循环稳定性/ Li电池比较小的电池/ Li电池更容易，这表明从孔的底部开始Li的沉积在限制所沉积的Li方面更为有效。基于对压缩的Li电极的阻抗分析，我们建议在孔的底部进行引导的Li沉积是由于顶表面和孔表面之间的自然表面钝化层的电阻存在较大差异。这种更好的理解可以进一步促进由高性能锂金属电池的表面图案引起的引导锂沉积。

更新日期：2018-08-24

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