Issue 22, 2022

Laser-induced breakdown spectroscopy to obtain quantitative three-dimensional hydrogen mapping in a nickel–metal-hydride battery cathode for interpreting its reaction distribution

Abstract

We present a method for obtaining a three-dimensional quantitative hydrogen distribution in a Ni–MH battery cathode using laser-induced breakdown spectroscopy (LIBS) and demonstrate that the reaction distribution in the cathode can be interpreted based on a state-of-charge (SOC) distribution converted from the hydrogen distribution. In this method, we measured the hydrogen emission-line intensities at 656.28 nm for a model cathode cycled five times at 2.3 mA cm−2 and a commercial Ni–MH battery cathode cycled 1000 times at 1C under a 3000 Pa helium atmosphere. Our results show that the average SOC in the SOC distributions of the cathodes agreed with those evaluated from X-ray diffraction and charge–discharge curves and that the overcharged areas exhibited SOC values above 100%. The present LIBS method will allow us to understand the deterioration mechanism of a Ni–MH battery and improve its cycle life and capacity.

Graphical abstract: Laser-induced breakdown spectroscopy to obtain quantitative three-dimensional hydrogen mapping in a nickel–metal-hydride battery cathode for interpreting its reaction distribution

Supplementary files

Article information

Article type
Paper
Submitted
15 jul 2022
Accepted
26 sep 2022
First published
14 okt 2022

Analyst, 2022,147, 5161-5169

Laser-induced breakdown spectroscopy to obtain quantitative three-dimensional hydrogen mapping in a nickel–metal-hydride battery cathode for interpreting its reaction distribution

S. Imashuku, T. Kamimura, T. Ichitsubo and K. Wagatsuma, Analyst, 2022, 147, 5161 DOI: 10.1039/D2AN01147F

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