Corrosion of Aluminum Substrates in Lithium-Ion Batteries.
Abstract
Controlled potential coulometry was used to investigate the stability of aluminum positive-electrode substrates of rechargeable lithium-ion batteries in solutions of lithium imide salt in ethylene carbonat-propylene carbonate-dimethyl carbonate (EC-PC-DMC) (20:20:60 vol.%). It was found that the protective surface film formed on aluminum in these solutions breaks down at potentials above 3.5 V during the charging of lithium-ion cells, resulting in the corrosion of aluminum substrates and the premature failure of these cells. It was also found that the use of lithium tetrafluoroborate (LiBF4) as an electrolyte additive prevents the breakdown of the protective film on aluminum substrates, thus preventing their corrosion at potentials above 3.5 V. In contrast to their behavior in the lithium imide solutions, the aluminum substrates were found to be quite stable in lithium methide electrolyte solutions and did not undergo any significant corrosion at potentials up to -4.5 V compared to the lithium reference electrode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1998
- Accession Number
- ADA342632
Entities
People
- Edward J. Plichta
- Wishvender K. Behl
Organizations
- United States Army Research Laboratory