Neutrally Buoyant PT-UUV Battery with High Specific Energy

The scope of this proposal is to develop a cell with a sulfur-based cathode and a lithium metal-based anode that meets the specified SG of <1 and 400Wh/kg but also cycles well enough to meet Navy UUV needs. We recognize that some battery companies have spent years developing this chemistry and that many challenges remain in order to make feasible cells. Our team proposes an approach that addresses the key issues with the design of lithium-sulfur cells. Our approach involves using a sulfur-based composite cathode and a proprietary lithium alloy foil. Our team has calculated specific energy and SG for a range of possible cathode formulations that are not only in the target area for the solicitation, but also address cycling and sulfur utilization. We have assembled the expertise to develop these cells - cathode material synthesis, pressure-tolerant battery experience and electrolyte system development - and will focus on developing a feasible solution that results in large format, buoyant, pressure-tolerant sulfur batteries.