7Li and 1H MAS NMR observation of interphase layers on lithium nickel oxide based positive electrodes of lithium-ion batteries
Language
en
Article de revue
This item was published in
Electrochemical and Solid-State Letters. 2004-04-16, vol. 7, n° 6, p. A140-A143
Electrochemical Society
English 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, ...Read more >
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. Upon hydration, this layer grows, while 1H NMR suggests that some lithium in the material is replaced by protons. Upon electrochemical cycling, the original layer is replaced by a different one, the solid electrolyte interphase, with distinct 7Li and 1H NMR signatures, showing its largely organic nature.Read less <
English Keywords
Positive electrode
Lithium ion batteries
Lithium nickel oxide
Interphase layers
Nuclear magnetic resonance
Origin
Hal imported