Electrolyte solution for nonaqueous electrolyte batteries, and nonaqueous electrolyte battery using same

Abstract

Disclosed is an electrolyte solution for nonaqueous electrolyte batteries using an aluminum foil as a positive electrode collector, which comprises (I) a nonaqueous organic solvent, (II) a solute thatis composed of an ionic salt containing fluorine, (III) at least one additive selected from the group consisting of fluorine-containing imide salts, fluorine-containing sulfonic acid salts and fluorine-containing phosphoric acid salts and (IV) at least one substance selected from the group consisting of chloride ions and chlorine-containing compounds that generate chloride ions by means of charging, and wherein the concentration of the component (IV) relative to the total amount of the component (I) and the component (II) is from 0.1 ppm by mass to 500 ppm by mass (inclusive) in terms of chlorine atoms. This electrolyte solution is able to be suppressed in dissolution of the aluminum component from the aluminum foil, which is used as a positive electrode collector, during the charging ina high temperature environment, even through this electrolyte solution contains the above-described additive.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte solution for a nonaqueous electrolyte battery and a nonaqueous electrolyte battery using the same. Background technique [0002] Among batteries as electrochemical devices, in recent years, power storage systems for small and high energy density applications such as information-related equipment, communication equipment, personal computers, video cameras, digital cameras, mobile phones, and smartphones, electric vehicles, Power storage systems for large-scale and high-power applications such as hybrid vehicles, fuel cell vehicle auxiliary power supplies, and power storage are attracting attention. One of the candidates thereof includes lithium non-aqueous electrolyte batteries such as lithium ion batteries, lithium batteries, and lithium ion capacitors. [0003] As an electrolyte solution for lithium nonaqueous electrolyte batteries (hereinafter sometimes referred to as "nonaqueous electrolyte ...

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Problems solved by technology

[0016] However, for the method of forming a corrosion inhibiting film, the process of processing the current collector increases, and for the method of replacing with CTFSI-Li, the production of CTFSI-Li consists of a multi-stage process. Therefore, any of the above-mentioned methods exist in order to prevent aluminum The problem that the cost is greatly increased due to the elution of components from the aluminum foil as the positive electrode current collector

[0017] In addition, the method of adding hydrofluoric acid or the like to the non-aqueous electrolytic solution has very little impact on cost, but the effect is not sufficient under more severe conditions such as high voltage

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