Evolution of LiFePO4 thin films interphase with electrolyte

N. Dupré, Marine Cuisinier, Y. Zheng, V. Fernandez, J. Hamon, M. Hirayama, R. Kanno, D. Guyomard

Research output: Contribution to journalArticle

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Abstract

Many parameters may control the growth and the characteristics of the interphase, such as surface structure and morphology, structural defects, grain boundaries, surface reactions, etc. However, polycrystalline surfaces contain these parameters simultaneously, resulting in a quite complicated system to study. Working with model electrode surfaces using crystallographically oriented crystalline thin films appears as a novel and unique approach to understand contributions of preferential orientation and rugosity of the surface. In order to rebuild the interphase architecture along electrochemical cycling, LiFePO4 epitaxial films offering ideal 2D (100) interfaces are here investigated through the use of non-destructive depth profiling by Angular Resolved X-ray Photoelectron Spectroscopy (ARXPS). The composition and structure of the interphase is then monitored upon cycling for samples stopped at the end of charge and discharge for various numbers of cycles, and discussed in the light of combined XPS and X-ray reflectivity (XRR) measurements. Such an approach allows describing the interphase evolution on a specific model LiFePO4 crystallographic orientation and helps understanding the nature and evolution of the LiFePO4/electrolyte interphase forming on the surface of LiFePO4 poly-crystalline powder.

Original languageEnglish
Pages (from-to)45-55
Number of pages11
JournalJournal of Power Sources
Volume382
DOIs
Publication statusPublished - 1 Apr 2018

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Keywords

  • Electrode/electrolyte interface
  • Lithium batteries
  • Model surface
  • XPS
  • XRR

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Dupré, N., Cuisinier, M., Zheng, Y., Fernandez, V., Hamon, J., Hirayama, M., Kanno, R., & Guyomard, D. (2018). Evolution of LiFePO4 thin films interphase with electrolyte. Journal of Power Sources, 382, 45-55. https://doi.org/10.1016/j.jpowsour.2018.02.029