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Batteries 2017, 3(4), 30;

Effects of Alkaline Pre-Etching to Metal Hydride Alloys

BASF/Battery Materials–Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
Author to whom correspondence should be addressed.
Received: 10 September 2017 / Revised: 28 September 2017 / Accepted: 29 September 2017 / Published: 5 October 2017
(This article belongs to the Special Issue Nickel Metal Hydride Batteries 2017)
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The responses of one AB5, two AB2, four A2B7, and one C14-related body-centered-cubic (BCC) metal hydrides to an alkaline-etch (45% KOH at 110 °C for 2 h) were studied by internal resistance, X-ray diffraction, scanning electron microscope, inductively coupled plasma, and AC impedance measurements. Results show that while the etched rare earth–based AB5 and A2B7 alloys surfaces are covered with hydroxide/oxide (weight gain), the transition metal–based AB2 and BCC-C14 alloys surfaces are corroded and leach into electrolyte (weight loss). The C14-predominated AB2, La-only A2B7, and Sm-based A2B7 showed the most reduction in the internal resistance with the alkaline-etch process. Etched A2B7 alloys with high La-contents exhibited the lowest internal resistance and are suggested for use in the high-power application of nickel/metal hydride batteries. View Full-Text
Keywords: metal hydride alloy; nickel metal hydride battery; alkaline bath; high rate performance; superlattice alloys; surface morphology metal hydride alloy; nickel metal hydride battery; alkaline bath; high rate performance; superlattice alloys; surface morphology

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Meng, T.; Young, K.-H.; Hu, C.; Reichman, B. Effects of Alkaline Pre-Etching to Metal Hydride Alloys. Batteries 2017, 3, 30.

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