Description: The Current batteries that provide energy storage on spacecraft are limited by their relatively low energy density, cycle life, and cycle duration. The Non-Flow-Through Fuel Cell (NFTFC) for High-Density Energy Storage system has a high projected energy storage density (>400 Wh/kg) and can be scaled up to accommodate long-duration discharges (e.g., to provide power throughout a 14-day lunar night). The NFTFC uses an integrated gas-liquid separation membrane to passively remove water without excess flow of reactants, which improves fuel utilization and allows for a simpler balance of plant. Flight tests aim to demonstrate system functionality – specifically that of the integrated phase separator – in a space environment. Problem Statement High-power, high-density energy sources are a key technology development area to enable future lunar surface operations. Incumbent lithium batteries have substantial flight heritage but relatively low energy storage densities (<300 Wh/kg at the system level). Although next-generation battery chemistries, such as lithium sulfur, have high projected energy densities, they are still in early stages of development and have lifetime issues. Technology Maturation Flight tests on Zero Gravity Corporation’s G-FORCE ONE are expected to demonstrate system functionality – specifically the integrated phase separator – in a relevant environment. The first flight test is expected to demonstrate the performance of the system with minimal gas purging to clear water from the fuel cell. The second flight test is expected to demonstrate true non-flow-through operation.

Benefits: Integrated phase separator: Allows for a simpler system design and higher fuel utilization than conventional fuel cells High-density energy: Provides mass and launch cost reduction relative to state-of-the-art battery technology Future Customers Potential for NASA and commercial aerospace companies for lunar surface and in-space energy storage Applicable to the U.S. Department of Defense, including high-altitude pseudo satellites (HAPS) and satellite energy storage