Lithiophilic Protective Dual Layer Enabling Stable Electrodeposition of Lithium at High Current Density

作者：S. Park, Ji-Wan Kim, Jinhong Kim, Dong-Won Kim · 发表于：ECS Meeting Abstracts · 年份：2025 · DOI：10.1149/ma2025-023448mtgabs

One of the most promising strategies for achieving high energy density is to use Li metal as an anode material owing to its high specific capacity and low electrode potential. Electrodeposition is an efficient technique for fabricating ultrathin and scalable Li metal electrodes. However, the fabrication of Li metal via electrodeposition presents several technical hurdles to its application in industrial processes. First, electrodeposition is usually conducted without external pressure, which results in nonuniform dendritic Li deposition. Moreover, electrodeposited Li is prone to side reactions with liquid electrolytes, and a high current density is required to reduce the electrodeposition time. In this study,we propose a pre-coated protective dual layer (PDL) for the uniform electrodeposition of Li metal onto an Agcoated Cu substrate under high current density and atmospheric pressure. The dual layer was prepared by pressing the bottom and top layers. The bottom layer was a semi-interpenetrating polymer network (semi-IPN)-type solid polymer electrolyte (SPE) based on poly(ethylene oxide) (PEO), cross-linked poly(ethylene glycol) diacrylate (PEGDA), and lithiumbis(trifluoromethanesulfonyl) imide (LiTFSI). The top layer, a lithiophilic polydopamine-coated cellulose membrane (PD-CM), induced fast and uniform Li+-ion flux through the membrane and suppressed short-circuit between the two electrodes. Various electrochemical characteristics were investigated to understand the elec...