Stability of aluminum in low-temperature lithium-ion battery electrolytes. Progress report, October 1997--September 1998
The authors investigated the stability of aluminum at the high positive potentials encountered during the charging of lithium-ion cells. The electrolyte in these cells consists of solutions of lithium hexafluorophosphate and lithium methide in binary- and ternary-solvent mixtures of ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate. They performed the investigations with the controlled potential coulometry technique. They found that a protective surface film was formed on aluminum electrodes in these solutions and that this film protected the electrodes from further corrosion. The protective surface film was found to break down in lithium methide solutions at 4.25 V versus a lithium reference electrode, and this resulted in increased corrosion of the aluminum electrodes at higher potentials. In contrast to lithium methide solutions, the protective surface film formed on aluminum electrodes in lithium hexafluorophosphate solutions was found to be quite stable and did not break down at potentials up to [approximately]5 V.
- Research Organization:
- Army Research Lab., Adelphi, MD (United States)
- OSTI ID:
- 6336204
- Report Number(s):
- AD-A-362036/XAB; ARL-TR-1879
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
25 ENERGY STORAGE
ALUMINIUM ALLOYS
BATTERY CHARGING
CORROSION
ELECTRIC BATTERIES
ELECTRODES
ELECTROLYTES
METHYL RADICALS
PROTECTIVE COATINGS
STABILITY
TEMPERATURE RANGE 0065-0273 K
ALKYL RADICALS
ALLOYS
CHEMICAL REACTIONS
COATINGS
ELECTROCHEMICAL CELLS
RADICALS
TEMPERATURE RANGE
360105* - Metals & Alloys- Corrosion & Erosion
250903 - Energy Storage- Batteries- Materials
Components
& Auxiliaries