Spontaneous reaction between an uncharged lithium iron silicate cathode and a LiPF6-based electrolyte

Abstract

The reaction between an uncharged Li₂FeSiO₄ (LFS) cathode and a LiPF₆-EC/DMC electrolyte is revealed by in situ XANES in coin cells. This study shows clear evidence of delithiation and iron oxidation in LFS prior to cycling. Subsequent cycling appears to partially restore the original lithiation level, an observation that needs to be taken into consideration in future LFS development work.