Microscopy and spectroscopy of lithium nickel oxide based particles used in high-power lithium-ion cells.

Journal Article · Sat Nov 01 04:00:00 EST 2003 · J. Electrochem. Soc.

DOI:https://doi.org/10.1149/1.1613291· OSTI ID:961267

Abraham, D P; Twesten, R D; Balasubramanian, M; Kropf, A J; Fischer, D; McBreen, J; Petrov, I; Amine, K; BNL,; NIST,

Structural and electronic investigations were conducted on lithium nickel oxide-based particles used in positive electrodes of 18650-type high-power Li-ion cells. K-edge X-ray absorption spectroscopy (XAS) revealed trivalent Ni and Co ions in the bulk LiNi{sub 0.8}Co{sub 0.2}O{sub 2} powder used to prepare the high power electrode laminates. Using oxygen K-edge XAS, high resolution electron microscopy, nanoprobe diffraction, and electron energy-loss spectroscopy, we identified a <5 nm thick modified layer on the surface of the oxide particles, which results from the loss of Ni and Li ordering in the layered R{bar 3}m structure. This structural change was accompanied by oxygen loss and a lowering of the Ni- and Co-oxidation states in the surface layer. Growth of this surface layer may contribute to the impedance rise observed during accelerated aging of these Li-ion cells.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE; EE; OUS; SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 961267
• Report Number(s): ANL/CMT/JA-45961
• Journal Information: J. Electrochem. Soc., Journal Name: J. Electrochem. Soc. Journal Issue: 11 ; Nov. 2003 Vol. 150; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: ENGLISH

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04 OIL SHALES AND TAR SANDS
25 ENERGY STORAGE
36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
AGING
COBALT IONS
COBALT OXIDES
DIFFRACTION
ELECTRODES
ELECTRON MICROSCOPY
ELECTRONS
ENERGY-LOSS SPECTROSCOPY
GROWTH
IMPEDANCE
IONS
LAYERS
LITHIUM
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LITHIUM OXIDES
MICROSCOPY
NICKEL
NICKEL IONS
NICKEL OXIDES
OXIDES
OXYGEN
PARTICLES
POWDERS
POWER
RESOLUTION
RISE
SPECTROSCOPY
SURFACES