Honda Motor Co., Ltd.
ELECTROLYTIC SOLUTION FOR LITHIUM ION SECONDARY BATTERY AND A LITHIUM ION SECONDARY BATTERY

Abstract:

The present invention provides an electrolytic solution for a lithium ion secondary battery containing imide-based lithium salt, and a lithium ion secondary battery that are able to block corrosion of aluminum and improve battery performance, even without increasing the concentration of the imide-based lithium salt. A specific solvent mixture having a specific composition is used in the electrolytic solution containing the imide-based lithium salt. Specifically, the electrolytic solution uses a solvent mixture containing a first solvent and a second solvent mixed in a specific ratio, the first solvent interacting with an electrolyte salt and showing a shift of a peak attributed to vibration of the solvent to a different position in the Raman spectrum, the second solvent having no interaction with the electrolyte salt.