Dupre, N., Cuisinier, M., Martin, J.-F. & Guyomard, D. (2014) Interphase Evolution at Two Promising Electrode Materials for Li-Ion Batteries: LiFePO4 and LiNi1/2Mn1/2O2. ChemPhysChem, 15 1922–1938.
Added by: Laurent Cournède (2016-03-10 21:01:55)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 1439-4235
Clé BibTeX: Dupre2014
Voir tous les détails bibliographiques
Mots-clés: cathode materials, Electrochemical properties, electrode/electrolyte interphase, Electrodes, Electrolytes, elevated-temperatures, insertion material, interfaces, Lithium-ion batteries, MAS NMR, NMR spectroscopy, positive-electrode, rechargeable lithium batteries, thermal-stability, x-ray-diffraction
Créateurs: Cuisinier, Dupre, Guyomard, Martin
Consultations : 8/480
Indice de consultation : 2%
Indice de popularité : 0.5%
The present review reports the characterization and control of interfacial processes occurring on olivine LiFePO4 and layered LiNi1/2Mn1/2O2, standing here as model compounds, during storage and electrochemical cycling. The formation and evolution of the interphase created by decomposition of the electrolyte is investigated by using spectroscopic tools such as magic-angle-spinning nuclear magnetic resonance (Li-7, F-19 and P-31) and electron energy loss spectroscopy, in parallel to X-ray photoelectron spectroscopy, to quantitatively describe the interphase and unravel its architecture. The influence of the pristine surface chemistry of the active material is carefully examined. The importance of the chemical history of the surface of the electrode material before any electrochemical cycling and the strong correlation between interface phenomena, the formation/evolution of an interphase, and the electrochemical behavior appear clearly from the use of these combined characterization probes. This approach allows identifying interface aging and failure mechanisms. Different types of surface modifications are then investigated, such as intrinsic modifications upon aging in air or methods based on the use of additives in the electrolyte or carbon coatings on the surface of the active materials. In each case, the species detected on the surface of the materials during storage and cycling are correlated with the electrochemical performance of the modified positive electrodes.
Added by: Laurent Cournède