The electrolyte contains polycations of a polymer having a functional group working as a Lewis base, and preferably contains at least one of polyamino acids, polyamines, and polyimines as the polycations. 特に、ポリカチオンとして、ポリアミノ酸,ポリアミン,ポリイミンの少なくともいずれかを含むことが好ましい。 - 特許庁