Suppressing Lithium Dendrite Growth by Metallic Coating on a Separator

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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.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2017-10
Language
English
Article Type
Article
Keywords

ENERGY-STORAGE; RECHARGEABLE BATTERIES; CURRENT COLLECTOR; SULFUR BATTERIES; OXYGEN BATTERIES; ANODE; PERFORMANCE; DEPOSITION; LAYER; ELECTRODES

Citation

ADVANCED FUNCTIONAL MATERIALS, v.27, no.45, pp.1704391

ISSN
1616-301X
DOI
10.1002/adfm.201704391
URI
http://hdl.handle.net/10203/237198
Appears in Collection
CBE-Journal Papers(저널논문)
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