| http://www.w3.org/ns/prov#value | - In a preferred embodiment of the present invention, a trialkylamine of the formula: ##STR1## wherein R1, R2 and R3 are the same or different and each is an alkyl group having at least 3 carbon atoms at least one of hydrogen atoms of which may be substituted with a fluorine atom is used in combination with LiPF6 as the electrolyte.
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