Advanced Space Energy Storage that Incorporates Long Cycle Life at High Depths of Discharge

ABSTRACT: The goal of this technology development is to design, develop and test Li-ion battery cells with long cyclic life composing an advanced cathode. There are number of candidate cathode and anode materials are considered promising candidates for lithium ion battery due to their large capacity and relatively good rate capability, low self-discharge and relatively good capacity retention as well as ease of monitoring state of charge. However, their cyclic life is still far from satisfying DOD"s needs for space application as stated above. Main challenges for current cathode materials include considerable deterioration of the cycle stability due to structural changes, dissolution of transition metal and oxygen; formation of passive layer from decomposition of electrolyte, impedance growth; and thermal instability of cathode material. In this proposed research, we will develop, evaluate and validate advanced materials (including anode, cathode and electrolyte) for use in Li-ion battery. Phase I focus is to prove that the proposed battery chemistry and advanced material are promising for Low Earth Orbit (LEO) application. Phase I work will provide a very good base and direction for further development in Phase II towards the goal of fabrication of Li-ion battery with specific energy>200 Wh/kg and demonstrate long cycle life (60,000) under 60-100% DOD LEO conditions. BENEFIT: Li-ion battery with high energy density and long cyclic life is essential for military and civilian space application, especially for low earth orbiting satellites. High energy density and long cyclic life are also highly demanded for daily life application, such as battery for lab-top computer and other portable equipments, such as medical devicesX-ray machine, ultrasound system etc.