By Grassmann H.
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Extra resources for Band 2, Teil 1. Gesammelte mathematische und physikalische Werke (1904)
The positive electrode is basically the same of Ni–Cd batteries. High density, spherical Ni(OH)2 is used (cells are assembled in the discharged state) which also contains Co and Zn. Both Co and Zn greatly limit the formation of g-NiOOH on overcharge, which is taken as responsible for the memory effect and causes morphological changes in the electrode . Furthermore, these additives improve the charge acceptance and retention at high temperatures (up to 45°C). Cell construction and performance are indicated in the following.
In addition to conventional charging techniques for Ni–MH cells, considering that large Ni–MH batteries are used in EV and HEV applications, charging by regenerative breaking has also to be mentioned. The energy lost during breaking is used to charge the battery at very high power, 500 W/kg. Not all batteries can accept charge in these conditions, but the Ni–MH one can do so over a relatively wide SOC and temperature range . 3. Batteries Used in Both Portable and Industrial/Vehicular Applications 55 (up to $1000–1200) before its capacity decreases to 80% of the initial value.
Prismatic cells use the conventional flat electrode stacks with intermediate separators. Practically, all Ni–MH batteries are sealed and use a limited amount of electrolyte (6 M KOH plus LiOH as an additive) to allow for fast gas diffusion and recombination. In cylindrical cells, the metal hydride electrode is connected to the can, which serves as the negative terminal and has to be metallic due the high internal pressures deriving from O2 evolution on fast charge. Large prismatic batteries may use both metal and plastic cases.