ORIGIN OF DETERIORATION FOR LiNiO2 CATHODE MATERIAL DURING STORAGE IN AIR

Lithium nickel oxide, a potential candidate for cathode material for lithium-ion batteries, showed a distinct deterioration after storage in air for a time. The origin of this deterioration was explored by investigating surface structure, surface species, and ionic oxidation state of fresh and store...

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Bibliographic Details
Published in:Electrochemical and solid-state letters 2004-01, Vol.7 (7), p.A190-A193
Main Authors: Liu, H S, Zhang, Z R, Gong, Z L, Yang, Y
Format: Article
Language:English
Online Access:Get full text
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Summary:Lithium nickel oxide, a potential candidate for cathode material for lithium-ion batteries, showed a distinct deterioration after storage in air for a time. The origin of this deterioration was explored by investigating surface structure, surface species, and ionic oxidation state of fresh and stored LiNiO2 materials. Rietveld analysis of XRD patterns showed not only the formation of Li2CO3 on the surface, but also a weakening of ordered layered structure for the stored materials. XPS revealed that Ni3+ transforms to Ni2+ and active oxygen species exist on the surface of stored materials. Temperature programmed desorption-mass spectroscopy measurements gave evidence that active oxygen species (O(-), O2(-)) occur on the surface of LiNiO2 after storage. A surface reaction mechanism based on the transformation of Ni3+/Ni2+ and the evolution of active oxygen species is proposed. 15 refs.
ISSN:1099-0062
DOI:10.1149/1.1738471