Structural fatigue in spinel electrodes in Li/Lix [Mn2]O4 cells
Document Type
Article
Publication Date
9-1999
Department
Department of Materials Science and Engineering
Abstract
Evidence of structural fatigue has been detected at the surface of discharged LixMn2]O4 spinel electrodes in Li/Lix[Mn2]O4 cells. Transmission electron microscopy has revealed a degradation of the structural integrity of Li[Mn2]O4 crystals in electrodes that were cycled between 3.3 and 2.2 V, where the transformation from cubic Li[Mn2]O4 to tetragonal Li2[Mn2]O4 is expected. It has also been observed in cells cycled at voltages above the 3 V plateau that domains of tetragonal Li2[Mn2]O4 coexist with cubic Li[Mn2]O4, even at 500 mV above the thermodynamic voltage expected for the onset of the tetragonal phase. It is proposed that the presence of Li2[Mn2]O4 on the particle surface may contribute to some of the capacity fade observed during cycling of Li/Lix[Mn2]O4 cells.
Publication Title
Journal of Power Sources
Recommended Citation
Shao-Horn, Y.,
Hackney, S. A.,
Kahaian, A.,
Kepler, K.,
Skinner, E.,
Vaughey, J.,
&
Thackeray, M.
(1999).
Structural fatigue in spinel electrodes in Li/Lix [Mn2]O4 cells.
Journal of Power Sources,
81-82, 496-499.
http://doi.org/10.1016/S0378-7753(98)00223-7
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/7535