Aging of LiNi1/3Mn1/3Co1/3O2 Cathode Material upon exposure to H2O

Xiaoyu Zhang (1) , W. J. Jiang (2) , X. P. Zhu (2) , A. Mauger (1) , Qi Lu (3) , C.M. Julien (4)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 CITIC Guoan Mengguli Power Source Technology Co.
3 Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University
4 PECSA - Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques

LiNi1/3Mn1/3Co1/3O2 compound was successfully synthesized by the co-precipitation method. The effect of H2O on LiNi1/3Mn1/3Co1/3O2 in humid atmosphere was investigated by structural, magnetic and electrochemical analysis, and Raman spectroscopy. The consequence is that immersion of LiNi1/3Mn1/3Co1/3O2 to H2O and exposure of LiNi1/3Mn1/3Co1/3O2 to humid atmosphere (ambient atmosphere, 20 °C, 50% relative humidity) led to a rapid attack that manifests itself by the delithiation of the surface layer of the particles and the concomitant formation of LiOH and Li2 CO3 at the surface. This aging process occurred during the first few minutes, then it is saturated, and the thickness of the surface layer at saturation is 10 nm. After aging, an initial discharge capacity of 139 mAh/g was delivered at 1 C-rate in the cut-off voltage of 3.0-4.3 V. About 95% of its initial capacity was retained after 30 cycles.

Mots clés: Li-ion batteries, Lamellar compounds, Surface aging

Domaines: Physique Quantique [quant-ph]

Xiaoyu Zhang, W. J. Jiang, X. P. Zhu, A. Mauger, Qi Lu, et al.. Aging of LiNi1/3Mn1/3Co1/3O2 Cathode Material upon exposure to H2O. Journal of Power Sources, 2011, 196, pp.5102-5108. ⟨hal-00582955⟩