METHOD FOR JUDGING AMOUNT OF IMPURITIES IN SOLVENT FOR ELECTROLYTE LIQUID, METHOD FOR PRODUCING ELECTROLYTE LIQUID USING SAME, AND ELECTROLYTE LIQUID

摘要

Provided are a method for judging the amount of impurities in a solvent for an electrolyte liquid to be used in a non-aqueous electrolyte liquid battery, that enables judging, more easily than conventionally, the amount in which several types of impurities causing degradation of battery performance is contained in the solvent; a method for producing an electrolyte liquid using this judging method; and an electrolyte liquid. The judging method includes: obtaining a reaction solution by adding a Lewis acid to the solvent; measuring the Hazen value of the reaction solution; and judging whether the value is no more than a predetermined threshold. The producing method includes mixing, with an electrolytic salt, the solvent for which the Hazen value has been judged to be no more than the threshold by the judging method. The electrolyte liquid contains: the solvent with the Hazen value as judged above; and an electrolytic salt.

主权项

1. A method for judging the amount of impurities in a solvent for an electrolyte liquid to be used in a non-aqueous electrolyte liquid battery, the method comprising:
a reacting step of obtaining a reaction solution by adding a Lewis acid to the solvent for an electrolyte liquid; a Hazen value measuring step of measuring the Hazen value of the reaction solution; and a judging step of judging whether the Hazen value is no more than a predetermined threshold.