Most current battery systems have solid electrodes, separated by liquid electrolytes. Aside from considerations such as the magnitude of the ionic conductivity of liquids typically being considerably greater than those of solids, one of the major advantages of this arrangement is that the presence of the liquid reduces problems resulting from the volume changes that typically result from the changes in the composition of the electrode materials as they are charged and discharged.
A major consideration in connection with electrolytes has to do with the range of potentials over which they are stable. An obvious example of this is the fact that aqueous electrolytes cannot be used with negative electrodes that have high lithium activities. Organic solvent electrolytes must be used instead.
KeywordsIonic Liquid Molten Salt Liquid Electrolyte Aqueous Electrolyte Negative Electrode
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