4 years ago

Suppressing Lithium Dendrite Growth by Metallic Coating on a Separator

Suppressing Lithium Dendrite Growth by Metallic Coating on a Separator
Hee-Tak Kim, Myung-Hyun Ryou, Chaojiang Niu, Jun Liu, Hyun Soo Jin, Lu Yu, Xiaodi Ren, Hongkyung Lee, Ji-Guang Zhang, Wu Xu, Inseong Cho, Mark H. Engelhard
Lithium (Li) metal is one of the most promising candidates for the anode in high-energy-density batteries. However, Li dendrite growth induces a significant safety concerns in these batteries. Here, a multifunctional separator through coating a thin electronic conductive film on one side of the conventional polymer separator facing the Li anode is proposed for the purpose of Li dendrite suppression and cycling stability improvement. The ultrathin Cu film on one side of the polyethylene support serves as an additional conducting agent to facilitate electrochemical stripping/deposition of Li metal with less accumulation of electrically isolated or “dead” Li. Furthermore, its electrically conductive nature guides the backside plating of Li metal and modulates the Li deposition morphology via dendrite merging. In addition, metallic Cu film coating can also improve thermal stability of the separator and enhance the safety of the batteries. Due to its unique beneficial features, this separator enables stable cycling of Li metal anode with enhanced Coulombic efficiency during extended cycles in Li metal batteries and increases the lifetime of Li metal anode by preventing short-circuit failures even under extensive Li metal deposition. Janus-faced separator design with ultrathin copper (Cu) metal film coating onto one side surface of the conventional polyethylene separator is proposed for lithium (Li) dendrite suppression and cycling stability improvement. Enabling the separator to be electrically and ionically conductive is very effective to facilitate the electrochemical deposition/stripping of Li metal and modulate of the Li metal/electrolyte interface structure.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201704391

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