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Structural Underpinnings of the Enhanced Cycling Stability upon Al-Substitution in LiNi0.45Mn0.45Co0.1–yAlyO2 Positive Electrode Materials for Li-ion Batteries
journal contribution
posted on 2012-09-11, 00:00 authored by Thomas
E. Conry, Apurva Mehta, Jordi Cabana, Marca M. DoeffSingle-phase LiNi0.45Mn0.45Co0.1–yAlyO2 layered
oxide materials with 0 ≤ y ≤ 0.10 were
prepared using the glycine-nitrate combustion method. Al-substitution
has a minimal effect on the defect concentration and rate capability
of the materials, but raises the operating voltage and reduces the
capacity fade of the materials during prolonged cycling compared to
the unsubstituted system. In situ X-ray diffraction suggests the presence
of Al has a significant structural impact during battery operation.
It acts to limit the changes in lattice parameters observed during
electrochemical charging and cycling of the materials. High-resolution
X-ray diffraction reveals structural distortions in the transition
metal layers of as-synthesized powders with high Al-contents, as well
as a structural evolution seen in all materials after cycling.