Rechargeable pulse power lithium alloy/iron disulfide batteries

Advanced lithium alloy/iron disulfide batteries optimized for high power densities of 2.9 kW/kg are currently under development at SAFT. Configured as a bipolar array of sealed cells, 10 kW scalable modules are under development operating at charge and discharge rates of 3 C and 73 C, respectively. A high conductivity molten salt electrolyte was used that provides superior pulse capability in excess of 6 W/cm². The electrolyte also serves as a separator layer with unlimited freeze thaw capabilities. The electrochemistry consists of a lithium aluminum alloy negative electrode, iron disulfide positive electrode, and magnesium oxide powder immobilized molten salt electrolyte. Pressed powders were cold compacted into circular disks which were assembled into bipolar cell hardware with peripheral ceramic seals. The results and discussions of tests performed on Li/FeS₂ and batteries during the first year are reported