Li metal is still one of promising anode candidates for advanced lithium secondary batteries due to its lowest potential (-3.045V vs. SHE) and high specific capacity (3860 mAh g^-1). However, dendrite formation during Li deposition process is known to be the main knotty problem to be solved. To overcome this challenging issue, a variety of previous approaches such as protection layer on Li metal, electrolyte additives, all-solid-state electrolytes, etc. have been attempted consistently (see Figure). However, their improvement levels are limited and insufficient to apply them to commercial-level secondary batteries.

To control lithium deposition/stripping location in the lithium metal, we have already proposed a micro-patterning technology with micro-needle and micro-stamp. [1-2] When micro patterns are formed on the lithium metal, the lithium deposition/stripping reaction is preferentially taken place within the patterns. With a simulation tool, Comsol Multiphysics ®, we can provide some discussion on which dimension will lead to better electrochemical performance. In addition, we will share state-of-the-art experimental results based on thin lithium metals and electrolyte additives, together.

References

1) M.-H. Ryou†, Y.M. Lee†, Y. Lee, M. Winter, and P. Bieker, Advanced Functional Materials 25(6) (2015) 834

2) J. Park†, J. Jeong†, Y. Lee†, M. Oh, M.-H. Ryou, and Y.M. Lee, Advanced Materials Interfaces 3 (2016) 1600140