Innovative, High-Energy, High Power, Light-Weight Battery Storage Systems Based on Li-air, Li-sulfur (Li-S) chemistries

Low cost and high capacity make lithium sulfur batteries (LSB) the next generation of lithium ion batteries. Practical application of LSB technology remains limited by low utilization of sulfur and fast capacity fading of sulfur cathodes. The root causes are poor electronic conductivity of the cathode combined with high solubility of intermediate polysulfide products formed during cycling. To overcome these limitations Navitas has demonstrated a new conductive nano-porous ceramic host material for LSB cathodes. This novel composition provides high affinity to both non-polar sulfur and polar polysulfides. To enhance LSB performance and life: (1) nanoporous structure accommodates sulfur volume change during cycling; (2) mechanical strength and conductivity enables high utilization of sulfur; and (3) high affinity to both sulfur and polysulfides minimizes sulfur dissolution. Phase I provided proof of concept validation of the cathode in laboratory prototype cells. In Phase II pilot scale electrode coating and cell assembly will be developed to support delivery of a 6Ah, 28V battery. Lithium sulfur batteries based on the proposed technology will reduce battery size and cost by 50 percent. Applications include most military and consumer devices operating on lithium ion batteries. With improved safety characteristics, aviation applications will be the initial target market.