Lithium tetrafluoroborate, lithium hexafluorophosphate and lithium perchlorate are used as an electrolyte of a lithium ion secondary battery. In this application, the anions of these salts were analyzed using IC NI-424, an anion analysis column for non-suppressor method.


Sample : 20 μL
1. BF₄^- 20 mg/L
2. ClO₄^- 50 mg/L
3. PF₆^- 50 mg/L

Column       : Shodex IC NI-424 (4.6 mm I.D. x 100 mm)
Eluent       : 8 mM 4-Hydroxybenzoic acid + 3.4 mM Bis-Tris + 2 mM Phenylboronic acid
               + 0.005 mM *CyDTA aq.
Flow rate    : 1.0 mL/min
Detector     : Non-suppressed conductivity
Column temp. : 40 ℃

* CyDTA: trans-1,2-Diaminocyclohexane-N,N,N',N'-tetraacetic acid