Purifier for removing hydrogen fluoride from electrolytic solution

摘要

The present invention is a purification system for removing hydrogen fluoride and water from an electrolytic solution for lithium-ion secondary batteries in which [1] a purifier for removing hydrogen fluoride containing a hydrogen fluoride adsorbent selected from among carbonate hydrotalcites and calcined hydrotalcites and [2] a purifier for removing water containing an adsorbent for trapping water are connected in this order from upstream to downstream.

主权项

1. A purification system for removing hydrogen fluoride and water from a non-aqueous electrolytic solution for a lithium ion secondary battery, comprising:
a purifier for removing hydrogen fluoride containing an adsorbent selected from carbonate hydrotalcites or calcined hydrotalcites; and a purifier for removing water connected downstream from the purifier for removing hydrogen fluoride, the purifier for removing water containing a water adsorbent, each purifier comprising a housing, an electrolytic solution inlet member, an electrolytic solution outlet member and mesh for preventing outflow of the adsorbent at the inlet and outlet of the housing, wherein the non-aqueous electrolytic solution flows into the purifier for removing hydrogen fluoride via the electrolytic solution inlet member of the purifier for removing hydrogen fluoride, whereby the non-aqueous electrolytic solution is supplied to the adsorbent selected from carbonate hydrotalcites or calcined hydrotalcites; out of the purifier for removing hydrogen fluoride via the electrolytic solution outlet member of the purifier for removing hydrogen fluoride; into the purifier for removing water via the electrolytic solution inlet member of the purifier for removing water, whereby the non-aqueous electrolytic solution is supplied to the water adsorbent; and out of the purifier for removing water via the electrolytic solution outlet member of the purifier for removing water.