Using the model solid electrolyte Li6.75La3Zr1.75Ta0.25O12 (LLZTO), we first show that ultra-high stripping/plating areal capacities up to the order of 30 mAh cm -2 can be reached in Li/NaK/LLZTO/NaK/Li symmetric cells (where the notation "NaK" denotes the liquid sodiumpotassium alloy of compositions discussed later) with low and stable area-specific-resistance (ASR, ~15 Ω cm 2 per interface) at current densities above 0.5 mA cm -2 . Such cell performance is achievable at minimal stack pressures and without "pre-forming" the Li metal/solid electrolyte interface at elevated stack pressures (>1.5MPa) and temperatures (~170°C), as is commonly done in the literature to form a low impedance (< 500 Ω cm 2 , < 35 Ω cm 2 per interface) Li/LLZTO interface. We further show that this dramatic increase in the accessible areal capacity at high stripping current densities is due to the presence of the Na-K liquid at the interface from which the lithium is being stripped. This performance improvement is not observed in the absence of the Na-K liquid. These results demonstrate the efficacy of a design approach that takes advantage of the low contact impedance and high accessible areal capacity of a liquid metal electrode, while having the shape retention and cell packaging advantages of solid metal electrodes, all without requiring high stack pressure.