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 7 2022
Accepted
26 9 2022
First published
14 10 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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