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Energy Generation & Storage
Batteries

Lithium ion batteries are used in a wide range of applications ranging from mobile devices and computers to automotives. There is a constant demand for improved performance and safety of Li ion batteries in order to make the technology more widely used.

Discover how Oxford Instruments can help you:

In order to improve the design and performance of the Li ion batteries it is important to understand the microstructure of the material. In this case particular to understand where the Li is located and how the structure might change during the lifetime of the battery.

Many of the materials used in the Li ion batteries have successfully been analysed using EDS or EBSD and the presence of Li either shown by detecting Li K X-rays or by measuring the change the crystal structure indicating the presence of Li.

Li has been detected in the material used for graphite anodes and many new materials used as electrolytes. For the cathode materials the ionic state of the Li ions means that so far no x-rays have been detected from Lithium.

Light element detection

Lithium x-rays has been detected using Extreme EDS from many of the compounds containing Li (1).

Examples covering a wide range of materials from LiH, LiF, Li3N, Li2S and LiCl.

The Ultim Extreme is an EDS detector optimized to deliver the ultimate performance in low energy EDS. Combined with a windowless design for maximum low energy sensitivity, this detector provides Extreme capabilities for light element detection.

Solid state electrolyte

Solid state electrolytes are being used to improve the safety and performance of the Li ion batteries. These electrolytes typically contain several chemically different phases and being able to identify the phases is vital in order to improve the designs.

In this example the chemical analysis of the phases in the garnet has been done using EDS to identify the phases.

LiNiO Cathode Material

You can’t detect Li with the Extreme due to the ionic state of the Li in this material. However you do get very good signal from the other light elements.

In this map you are able to detect the Flourine shell on the LiNiO grains. This is residual material from the processing of the cathode and understanding these layers gives you valuable understanding of the battery performance.

References:

  1. Multiscale Phase Mapping of LiFePO4 based Electrodes by Transmission Electron Microscopy and Electron Forward Scattering Diffraction by Donatien Robert
  2. Can we detect Li K X-Ray in Lithium Compounds Using Energy Dispersive Spectroscopy? P. Hovington, et al, Scanning, 38 2016, p571
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