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2. Nickel-metal-hydride battery design
The design of a nickel-metal-hydride battery is comparable to that of a nickel-cadmium battery, although the reaction at the negative electrode is very different in nature. The materials used (nickel hydroxide, foam, foil, electrolyte) are also very similar to those used in nickel-cadmium batteries.
2.1 Electrochemical reactions
At the positive electrode, the raw material is nickel hydroxide Ni(OH) 2 , which has the property of yielding an electron and a proton to form nickel oxyhydroxide NiO(OH). As the electrolyte is strongly basic, the proton will react with an OH anion – to form a water molecule. The reaction can be written as :
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Nickel-metal-hydride battery design
Failure mode for Ni-MH batteries
Bibliography
Websites
Panasonic catalog – Eneloop element https://www.panasonic-eneloop.eu
VARTA microbattery http://products.varta-microbattery.com
...Events
Congrès Batteries 2018, takes place every year in Nice
Show: Batimat Reed Expositions International construction show, held every two years in Paris (odd-numbered years). http://www.batimat.com
Captronic Day https://www.captronic.fr
...Standards and norms
- Alkaline and other non-acid batteries – Sealed batteries for portable applications – Part 2: Nickel-metal hydride - IEC 61951-2 - 2017
Patents
BECCU (K.). – Electrical Accumulator with a Metal Hydride Serving as the Cathodic Reactive Material Arranged in Suspension in the Electrolyte. U.S. Patent 3,520,728, July 14, 1970.
YASUYUKI (H.), TADAYOSHI (T.), YOSHIFUM (M.), KATSUHIKO (S.), TOSHIYUKI (N.) and IKUO (Y.). – Separator for nickel-metal hydride storage battery and nickel-metal hydride storage battery. Japanese Patent 2003068270 (A) – July...
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