Structural Underpinnings of the Enhanced Cycling Stability upon Al-Substitution in LiNi_0.45Mn_0.45Co_0.1-yAl_yO₂ Positive Electrode Materials for Li-ion Batteries

Journal Article · Tue Oct 23 00:00:00 EDT 2012 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm3011937· OSTI ID:1050753

Conry, Thomas E; Mehta, Apurva; Cabana, Jordi; Doeff, Marca M ^[1]

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1. UCB

Single-phase LiNi_0.45Mn_0.45Co_0.1-yAl_yO₂ 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.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: DOE - OTHER
• OSTI ID: 1050753
• Journal Information: Chemistry of Materials, Vol. 24, Issue (17) ; 09, 2012; ISSN 0897-4756
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM OXIDES
CAPACITY
COBALT OXIDES
COMBUSTION
DEFECTS
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELECTRODES
ELECTRIC BATTERIES
LATTICE PARAMETERS
LAYERS
LITHIUM IONS
LITHIUM OXIDES
MANGANESE OXIDES
MATERIALS
NICKEL OXIDES
OPERATION
OXIDES
POWDERS
STABILITY
TRANSITION ELEMENTS
X-RAY DIFFRACTION