Purifier for removing hydrogen fluoride from electrolytic solution

Abstract

The present invention is a purification system for removing hydrogen fluoride and water from an electrolytic solution for lithium-ion secondary batteries in which a purifier for removing hydrogen fluoride containing a hydrogen fluoride adsorbent selected from among carbonate hydrotalcites and calcined hydrotalcites and a purifier for removing water containing an adsorbent for trapping water are connected in this order from upstream to downstream.

Description

technical field [0001] The present invention relates to a refining device (also referred to as a purification device, a purification device) used in the manufacturing process of a non-aqueous electrolyte solution for a lithium ion secondary battery and the manufacturing process of a lithium ion secondary battery. More specifically, The present invention relates to a purification device for removing hydrogen fluoride and further removing water by passing a hydrogen fluoride-containing non-aqueous electrolytic solution for lithium ion secondary batteries therethrough. [0002] this application claims priority based on Japanese application Japanese Patent Application No. 2009-286334 for which it applied in Japan on December 17, 2009, and uses the content here. Background technique [0003] Lithium-ion secondary batteries have a structure in which a positive electrode material coated on aluminum foil and a negative electrode material coated on copper foil are opposed to each oth...

AI Technical Summary

Problems solved by technology

However, these fluorides have the property of dissociating hydrogen fluoride by hydrolysis, which causes the following problems: the generated hydrogen fluoride causes dissolution of electrode materials, corrosion of current collectors, etc., resulting in degradation of battery performance.

In order to reduce the incorporation of moisture, manufacturing operations must be carried out in places where the humidity is controlled to be low, such as a dry room, which leads to an increase in production costs

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