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Issue 35, 2015
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Nano-structural changes in Li-ion battery cathodes during cycling revealed by FIB-SEM serial sectioning tomography

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Abstract

The growing demand for reliable, durable electrical energy systems to power electric and hybrid vehicles motivates worldwide efforts aimed at developing high-energy, high-power density batteries. One of the obstacles to widespread industry adoption is the lack of profound understanding and the ability to monitor and control the long-term degradation and capacity fading observed in these systems. Focused Ion Beam-Scanning Electron Microscopy (FIB-SEM) serial sectioning is used to reconstruct the evolution of the three-dimensional structure of Li-ion battery electrodes during extended cycling. High resolution imaging reveals microstructural information at the level of the composite framework consisting of the spheroidal micro-particles of the active material held together by the polymer matrix. The evolution of damage within the micro-particles of the active material can be seen in the form of voiding, cracking and ultimate fragmentation. In particular, when spherical micro-particles of Li-rich layered oxides are used as the cathode, it is found that the extent of fragmentation varied in the direction of Li+ diffusion current from the particle surface inwards. We use a simple model of the strain and strain gradient effects of Li+ transient diffusion within the electrode to identify the driving force for particle fragmentation, and discuss the implication of these results.

Graphical abstract: Nano-structural changes in Li-ion battery cathodes during cycling revealed by FIB-SEM serial sectioning tomography

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Publication details

The article was received on 08 Jun 2015, accepted on 27 Jul 2015 and first published on 27 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA04151A
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Citation: J. Mater. Chem. A, 2015,3, 18171-18179
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    Nano-structural changes in Li-ion battery cathodes during cycling revealed by FIB-SEM serial sectioning tomography

    B. Song, T. Sui, S. Ying, L. Li, L. Lu and A. M. Korsunsky, J. Mater. Chem. A, 2015, 3, 18171
    DOI: 10.1039/C5TA04151A

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