[sup 7]Li and [sup 1]H MAS NMR Observation of Interphase Layers on Lithium Nickel Oxide Based Positive Electrodes of Lithium-Ion Batteries

Abstract

7Li and 1H magic-angle spinning (MAS) NMR spectra were recorded for Li(Ni,Co,Al)O2 samples. The 7Li MAS NMR signal of the layer on the pristine material is close to that of Li2CO3 in close contact with it. Its lineshape, due to dipolar interaction with electron spins of the material, is drastically different from that of pure Li2CO3...