High-Energy, Long-Life Lithium-Sulfur Batteries Navy SBIR FY2015.2 Sol No.: Navy SBIR FY2015.2 Topic No.: N152-093 Topic Title: High-Energy, Long-Life Lithium-Sulfur Batteries Proposal No.: N152-093-0540 Firm: TDA Research, Inc. 12345 W. 52nd Ave. Wheat Ridge, Colorado 80033 Contact: Steven Dietz Phone: (303) 940-2312 Abstract: Batteries with multi-electron redox materials offer promise for increased performance relative to state of the art lithium-ion batteries. Lithium-sulfur (Li-S) batteries have two electron cathode materials (in addition to a lithium metal anode) and better than two times the specific energy of Li-ion batteries. However, several issues have prevented Li-S batteries from becoming more commercially viable. The sulfur cathode is both ionically and electronically insulating and so requires a conductive matrix. In addition, cycle life is limited by diffusion of polysulfides to the anode where they are reduced to Li-S2 and become inactive; historically the cycle life has been relatively poor ( Benefits: Batteries with multi-electron redox materials offer promise for increased performance relative to state of the art lithium-ion batteries. Lithium-sulfur (Li-S) batteries have two electron cathode materials (in addition to a lithium metal anode) and better than two times the specific energy of Li-ion batteries. However, several issues have prevented Li-S batteries from becoming more commercially viable. The sulfur cathode is both ionically and electronically insulating and so requires a conductive matrix. In addition, cycle life is limited by diffusion of polysulfides to the anode where they are reduced to Li-S2 and become inactive; historically the cycle life has been relatively poor ( Return