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Li distribution characterization in Li-ion batteries positive electrodes containing LixNi0.8Co0.15Al0.05O2 secondary particles

By K. Mima, Raquel Gonzalez Arrabal, H. Azuma, A. Yamazaki, C. Okuda, H. Ukyo, H. Sawada, K. Fujita, Y. Kato, José Manuel Perlado Martín and S. Nakai

Abstract

The elemental distribution of as-received (non-charged) and charged Li-ion battery positive electrodes containing LixNi0.8Co0.15Al0.05O2 (0.75 ? x ? 1.0) microparticles as active material is characterized by combining μ-PIXE and μ-PIGE techniques. PIGE measurements evidence that the Li distribution is inhomogeneous (existence of Li-rich and Li-depleted regions) in as-received electrodes corresponding with the distribution of secondary particles but it is homogeneous within the studied individual secondary micro-particles. The dependence of the Li distribution on electrode thickness and on charging conditions is characterized by measuring the Li distribution maps in specifically fabricated cross-sectional samples. These data show that decreasing the electrode thickness down to 35 μm and charging the batteries at slow rate give rise to more homogeneous Li depth profiles

Topics: Energía Nuclear
Year: 2012
DOI identifier: 10.1016/j.nimb.2012.08.016
OAI identifier: oai:oa.upm.es:16143
Provided by: Archivo Digital UPM

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