Structural, magnetic, and electrochemical studies on lithium insertion materials LiNi{sub 1-x}Co{sub x}O{sub 2} with 0{<=}x{<=}0.25

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.05.019· OSTI ID:21421568

Mukai, Kazuhiko ^[1]; Sugiyama, Jun; Aoki, Yoshifumi ^[1]

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1. Toyota Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192 (Japan)

The structural, magnetic, and electrochemical properties of the LiNi{sub 1-x}Co{sub x}O{sub 2} samples with x= 0, 0.05, 0.1, and 0.25 have been investigated by powder X-ray diffraction analyses, magnetic susceptibility ({chi}) measurements, and electrochemical charge and discharge test in non-aqueous lithium cell. According to the structural analyses using a Rietveld method, the occupancy of the Ni ions in the Li layer was estimated to be below 0.01 for all the samples and was eventually independent of x. The temperature (T) dependence of {chi}{sup -1} obtained with the magnetic field H=10 kOe indicated that all the samples are a Curie-Weiss paramagnet down to {approx}100K. At low T, all the samples entered into a spin-glass-like phase below T{sub f}. The magnitude of T{sub f} was found to decrease almost linearly with x, as in the case for the x dependences of the lattice parameters of a{sub h}- and c{sub h}-axes, Weiss temperature, and effective magnetic moment. It is, therefore, found that the change of the magnetic properties with x is simply explained by a dilution effect due to the increase of the quantity of Co{sup 3+} ions. On the other hand, the electrochemical measurements demonstrated that the irreversible capacity at the initial cycle is drastically decreased by the small amount of Co ions. Furthermore, the discharge capacity (Q{sub dis}) for the x=0.05 and 0.1 samples are larger than that for the x=0 sample; namely, Q{sub dis}=180 mAh g{sup -1} for x=0, Q{sub dis}=217 mAh g{sup -1} for x=0.05, and Q{sub dis}=206 mAh g{sup -1} for x=0.1. Comparing with the past results, the amount of Ni ions in the Li layer is found to play a significant role for determining the magnetic and electrochemical properties of LiNi{sub 1-x}Co{sub x}O{sub 2}. - Graphical Abstract: The inter-relationship between structural, magnetic, and electrochemical properties of the lithium insertion materials LiNi{sub 1-x}Co{sub x}O{sub 2} with 0{<=}x{<=}0.25 were investigated by X-ray diffraction measurements, magnetic susceptibility measurements, and electrochemical charge and discharge test in non-aqueous lithium cell. The magnitude of spin-glass-like transition temperature T{sub f} was found to decrease almost linearly with x, as well as the x dependences of effective magnetic moment, Weiss temperature, and lattice parameters.

• OSTI ID: 21421568
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 7; Other Information: DOI: 10.1016/j.jssc.2010.05.019; PII: S0022-4596(10)00220-3; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT IONS
COBALT OXIDES
ELECTRIC BATTERIES
ELECTROCHEMISTRY
LATTICE PARAMETERS
LAYERS
LITHIUM COMPOUNDS
LITHIUM IONS
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
NICKEL COMPOUNDS
NICKEL IONS
SPIN GLASS STATE
TEMPERATURE RANGE 0065-0273 K
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CHEMISTRY
COBALT COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
ELECTROCHEMICAL CELLS
ENERGY STORAGE SYSTEMS
ENERGY SYSTEMS
IONS
MAGNETIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS