An electrolyte for an electrolytic capacitor which is high in electrolytic conductivity, excellent in heat stability and high in withstand voltage. An electrolyte for an electrolytic capacitor comprising a tetrafluoroaluminate ion; and an electrolyte for an electrolytic capacitor containing a salt and a solvent, characterized in that electrolytic conductivity X (mS·cm
−1
) at 25° C. and withstand voltage Y (V) of a capacitor satisfy the relationships of formulae (I): Y≧−7.5X+150, and X≧4, Y>0.
一种电解电容器的电解质,具有高电解导电性,优异的热稳定性和高耐压性。一种电解电容器的电解质包括四
氟铝酸盐离子;以及一种包含盐和溶剂的电解电容器的电解质,其特征在于在25°C下的电解导电度X(mS·cm-1)和电容器的耐压Y(V)满足公式(I)的关系:Y≥-7.5X+150,且X≥4,Y>0。