Metal Organic Framework (MOF) Based Lithium Ion Electrolyte

During a Phase I program Physical Sciences Inc. (PSI) has demonstrated a nano-porous/polymer composite separator for low temperature operation of lithium ion batteries. These continuous nano-porous structures sequester inexpensive liquid lithium ion battery electrolytes depressing both their freezing point and vapor pressure. During the Phase II program PSI proposes to optimize and demonstrate this system in prototype cells. In Phase I, more than an order of magnitude increase in lithium ion conductivity over conventional separator/electrolyte systems was demonstrated at -40°C, resulting in significantly improved battery rate capability. In Phase II, the system performance will be further improved by optimizing the polymer and electrolyte components. Pouch cells will be constructed to demonstrate scale up and cell level performance at low temperatures and over extended cycling. In year 2, larger cylindrical cells will be constructed by an industrial partner and the performance evaluated in order to demonstrate readiness for transition to a commercial or military application. BENEFIT: The primary market for the proposed technology is the military in particular for space applications. The temperature extremes and long cycle life demands of space deployment would benefit from the robust electrolyte. Similarly, the proposed technology would be beneficial in the uniquely harsh environments in which battery powered combat devices operate. The reduced solvent vapor pressure and char forming ability of the nanoporous components could allow the development of a non-flammable electrolyte for use in everyday batteries. This would allow the technology to be extended to commercial devices such as hybrid and electric vehicles, cordless power tools, remote sensing devices, and portable communications such as cell phones and two-way radios.