Interfacial stabilization of Li-metal anode in all-solid-state battery using fluorinated polyimide protective layer

Abstract

In early battery history, the frequent ignition of lithium metal failed to commercialize it. However, as various nanomaterial technologies have recently developed, fine electrochemical control has become possible. Researchers around the world are paying attention to lithium metal batteries, which have higher energy density than lithium-ion batteries. Ultimately, in order to suppress the growth of dendrite between the lithium metal surface and the electrolyte, a uniform and stable protective layer must be made to allow a uniform current to flow. The protective layer on lithium metal can function as the artificial SEI layer that stabilizes the interfacial phenomena thus enables the facile Li-ion transportation and better cycleability. Recently, the advancement in stabilization has been reported. In this paper, the criteria for selecting the proper coating materials are discussed and the electrochemical experiment are also performed. When using polymeric materials, the polarity difference determines the viscosity and lithium-ion selectivity, flexibility, etc. As a result, it was demonstrated in the performance evaluation of all-solid-state battery systems that the Ohmic resistance was reduced and life was improved by reducing the energy loss. Thus it necessitates the stable protective layer on lithium metal.