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Nickel-Metallhydrid-Akkumulator

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by

Hannah Eb

on 4 January 2013

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Transcript of Nickel-Metallhydrid-Akkumulator

Nickel-Metallhydrid-Akkumulator U KOH Ni(OH) 2 NiO(OH) KOH Laden Entladen Metall-H Metall K + OH - + + - e - e - NiO(OH) + e + H O - 2 + 2e - +2 H O 2 Metall-H +OH - + 2 OH - Anode Kathode K + OH + - 2 Ni(OH) + Metall 2 2 NiO(OH) +Metall-H + H O 2 e e - - e - + Ni(OH) + OH - 2 + 2 OH - Metall + 2 H O 2 + 2e - 2NiO(OH) +Metall-H 2Ni(OH) +Metall 2 Anode Kathode Akkumulatoren sind galvanische Zellen, deren Zellreaktionen umkehrbar sind. Nach der Entladung lassen sie sich wieder aufladen. Ni(OH) + OH NiO(OH) + e +H O 2 2 - - -II +I -II +I +II +III -II -II +I -II +I Oxidation Metall + 2H O + 2e Metall-H + 2OH 2 - - 0 +I -II +II -II +I -I Reduktion -IIII 0,49V - (-0,83V)=1,32V Spannung Lebendsdauer 500 Ladezyklen +III +I -I +II Oxidation Reduktion 2 2 2 Oxidation +II 2 2 Legierung
La Nd Ni Co Si 0,8 0,2 2,5 2,4 0,1
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