For Li metal solid-state batteries, operation at commercially relevant current densities and areal capacities typically produces contact loss at the anode/electrolyte interface, leading to impedance rise and cell failure. This work demonstrates that a liquid metal interlayer allows maintenance of a conformal anode/electrolyte interface, enabling up to ~30 mAh/cm2 areal capacity, about 10 times that of state-of-art batteries, without the need for applied stack pressure or heat treatments.