Charge characteristics of sealed-type nickel/metal-hydride battery

• Published in: Journal of alloys and compounds Vol. 267; no. 1; pp. 252 - 256
• Main Authors: Ikoma, Munehisa, Yuasa, Shin-ichi, Yuasa, Koji, Kaida, Satoshi, Matsumoto, Isao, Iwakura, Chiaki
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 06.03.1998; Elsevier
• Subjects: Applied sciences; Battery internal pressure; Charge characteristics; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Hydrogen absorption; Hydrogen storage alloy; Nickel/metal hydride battery; Nickel/metal hydride battery; Hydrogen absorption; Battery internal pressure; Hydrogen storage alloy; Charge characteristics; Gas absorption; Storage; Hydrogen; Battery; Secondary cell; Nickel; Metal Hydrides; Electrochemical characteristic; Internal pressure; Accumulator recharge
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(97)00492-1

Factors for elevating the battery internal pressure of sealed-type nickel/metalhydride (Ni–MH) battery during rapid charge were investigated, and a suppressing method and the mechanism were discussed. As a result, elevation of battery internal pressure during rapid charge was found to be caused by hydrogen gas generated at the negative electrode. It was also found that the battery internal pressure during rapid charge is notably suppressed by letting the surface of negative electrode be hydrophobic. This is considered to be owing to the promotion of chemical absorption of hydrogen onto the hydrogen storage alloy at the solid–liquid interface.