OVERCHARGE PROTECTION ADDITIVES FOR RECHARGEABLE LITHIUM BATTERIES

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 17069
Amount: $499,543.00
Phase: Phase II
Program: SBIR
Awards Year: 1992
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Covalent Assoc Inc.
52 Dragon Ct, Woburn, MA, 01801
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
HIGH-ENERGY-DENSITY, RECHARGEABLE LITHIUM BATTERIES ARE BEING CONSIDERED BY NASA FOR FUTURE MANNED AND UNMANNED MISSIONS. BECAUSE LITHIUM BATTERIES CONTAINING NON-AQUEOUS ELECTROLYTES ARE HIGHLY SENSITIVE TO OVERCHARGE, ESPECIALLY WHEN INDIVIDUAL CELLS ARE CONNECTED IN SERIES, AN ADEQUATE OVERCHARGE PROTECTION MECHANISM MUST BE INCORPORATED INTO THE CELL DESIGN. PHASE I ADDRESSES THIS NEED BY EXPLORING THE ADDITION OF SEVERAL ROBUST REDOX COUPLES TO THE NON-AQUEOUS ELECTROLYTE. THESE ADDITIVES ARE ELECTROACTIVE JUST POSITIVE OF THE NORMAL CELL CUTOFF VOLTAGE ON CHARGE AND NEGATIVE OF IRREVERSIBLE ELECTROLYTE OXIDATION POTENTIAL. PRELIMINARY TESTS SUGGEST THAT THIS PARTICULAR CLASS OF REDOX COUPLES WILL ALSO ENHANCE THE CYCLEABILITY OFTHE LI ELECTRODE AND SUPPRESS ELECTROLYTE REDUCTION. DURINGPHASE I THE LONG-TERM CHEMICAL AND ELECTRO-CHEMICAL STABILITY OF THESE MATERIALS WILL BE ASSESSED PRIOR TO SUBJECTING THEM TO CYCLING IN LI/TIS2 CELLS AND MULTICELL BATTERIES. HIGH-ENERGY-DENSITY, RECHARGEABLE LITHIUM BATTERIES ARE BEING CONSIDERED BY NASA FOR FUTURE MANNED AND UNMANNED MISSIONS. BECAUSE LITHIUM BATTERIES CONTAINING NON-AQUEOUS ELECTROLYTES ARE HIGHLY SENSITIVE TO OVERCHARGE, ESPECIALLY WHEN INDIVIDUAL CELLS ARE CONNECTED IN SERIES, AN ADEQUATE OVERCHARGE PROTECTION MECHANISM MUST BE INCORPORATED INTO THE CELL DESIGN. PHASE I ADDRESSES THIS NEED BY EXPLORING THE ADDITION OF SEVERAL ROBUST REDOX COUPLES TO THE NON-AQUEOUS ELECTROLYTE. THESE ADDITIVES ARE ELECTROACTIVE JUST POSITIVE OF THE NORMAL CELL CUTOFF VOLTAGE ON CHARGE AND NEGATIVE OF IRREVERSIBLE ELECTROLYTE OXIDATION POTENTIAL. PRELIMINARY TESTS SUGGEST THAT THIS PARTICULAR CLASS OF REDOX COUPLES WILL ALSO ENHANCE THE CYCLEABILITY OFTHE LI ELECTRODE AND SUPPRESS ELECTROLYTE REDUCTION. DURINGPHASE I THE LONG-TERM CHEMICAL AND ELECTRO-CHEMICAL STABILITY OF THESE MATERIALS WILL BE ASSESSED PRIOR TO SUBJECTING THEM TO CYCLING IN LI/TIS2 CELLS AND MULTICELL BATTERIES.

* information listed above is at the time of submission.

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government