Abstract
A simple charge-porosity diagram is presented for the rapid estimation of charge capacity in battery electrodes. Porosity changes reflect differences in mole volumes of the reactants and reaction products. Each system has a specific sensitivity to porosity changes. This diagram can be a useful tool for the assessment of mass and current transport performance of electrodes that give insoluble reaction products. Alkaline Cd, Zn and Fe electrolytes are compared.
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Abbreviations
- c :
-
electrolyte concentration mol cm−3
- F :
-
the Faraday equivalent, As per mol equiv
- I :
-
current, A
- M :
-
mole weight
- ¯Q :
-
normalized charge density, dimensionless
- R :
-
reactant balance ratio between matrix and electrolyte phases
- t :
-
time, s
- V :
-
electrode volume, cm3
- ¯V :
-
partial mole-volumes, cm3 mol−1
- (s):
-
solid phase
- (aq):
-
aqueous phase
- ε :
-
porosity
- ρ :
-
density, g cm−3
- ν :
-
stoichiometric coefficients
- i:
-
species i
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Selånger, P. Analysis of porous alkaline Cd-electrodes. III. The application of charge porosity diagrams in electrode design. J Appl Electrochem 4, 263–266 (1974). https://doi.org/10.1007/BF01637236
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DOI: https://doi.org/10.1007/BF01637236