THE GOAL OF THIS PROJECT IS TO DEVELOP NOVEL ELECTROLYTES OR ELECTROLYTE/ADDITIVE COMBINATIONS THAT RESULT…

Public award description

THE GOAL OF THIS PROJECT IS TO DEVELOP NOVEL ELECTROLYTES OR ELECTROLYTE/ADDITIVE COMBINATIONS THAT RESULT IN FLAME RETARDANT, ELECTROCHEMICALLY STABLE ELECTROLYTES FOR LITHIUM ION BATTERIES. THIS PROJECT IS TO DEVELOP ELECTROLYTES WITH REDUCED FLAMMABILITY AND IMPROVED ELECTROCHEMICAL STABILITY FOR NASA APPLICATIONS. THE CREATED ELECTROLYTE SOLUTIONS WILL BE TESTED IN SMALL (COIN AND POUCH) AND IN TRUE PRISMATIC 7 OR 10AH CELLS WITH THE DIFFERENT CATHODE MATERIALS AND. STATE-OF THE-ART CELLS WILL BE MODIFIED SO THAT THE CELLS PERFORM COMPARABLE TO THE AEROSPACE CELLS IN TERMS OF RATE CAPABILITY AND IRREVERSIBLE CAPACITY. THE BATTERY CELL MUST DISPLAY THE FOLLOWING CHARACTERISTICS: I) SPECIFIC ENERGY VALUES >1100 WH/KG, II) IMPROVED THERMAL STABILITY COMPARED TO THE CONVENTIONAL LITHIATED COBALT OXIDE OR NICKEL COBALT OXIDE SYSTEMS, III) HIGH LITHIUM DIFFUSIVITY COMPARED TO LITHIATED COBALT OXIDE OR NICKEL COBALT OXIDE SYSTEMS (10-10 CM2/S), TO SUPPORT DISCHARGE RATES OF C/5 OR HIGHER (WITH MINIMAL DERATING IN THE SPECIFIC ENERGY OVER A TEMPERATURE RANGE OF -10OC TO +40OC), IV) GOOD CHEMICAL AND ELECTROCHEMICAL STABILITY COMBINED WITH GOOD REVERSIBILITY TO PROVIDE ~ 80% OF THE INITIAL CAPACITY AFTER 2000 CYCLES AT 100% DOD AT C/2 FOR THE HIGH ENERGY CELL AND 80% OF THE INITIAL CAPACITY AFTER 200 CYCLES AT 100% DOD AT C/10 FOR THE ULTRA-HIGH ENERGY CELL (SEE TABLE 1). V) OVERALL SAFETY, IN TERMS OF TOLERANCE TO OVERCHARGE AND TO EXPOSURE TO HIGH TEMPERATURES, COMPARABLE OR SUPERIOR TO THE CONVENTIONAL LITHIATED COBALT OXIDE OR NICKEL COBALT OXIDE SYSTEMS AND VI) LOW TOXICITY, ONCE AGAIN COMPARABLE OR BETTER THAN THE CONVENTIONAL LITHIATED COBALT OXIDE OR NICKEL COBALT OXIDE SYSTEMS.