Interphase evolution at two promising electrode materials for li-ion batteries: LiFePO4 and LiNi1/2Mn1/2O 2

Nicolas Dupré, Marine Cuisinier, Jean Frederic Martin, Dominique Guyomard

Research output: Contribution to journalReview article

13 Citations (Scopus)

Abstract

The present review reports the characterization and control of interfacial processes occurring on olivine LiFePO4 and layered LiNi 1/2Mn1/2O2, 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 (7Li, 19F and 31P) 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.

Original languageEnglish
Pages (from-to)1922-1938
Number of pages17
JournalChemPhysChem
Volume15
Issue number10
DOIs
Publication statusPublished - 21 Jul 2014
Externally publishedYes

    Fingerprint

Keywords

  • electrodes
  • electrolytes
  • interfaces
  • lithium-ion batteries
  • NMR spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this