Li+ Extraction/Insertion Reactions with LiAlMnO4 and LiFeMnO4 Spinels in the Aqueous Phase

✍ Scribed by Yi-Fan Liu; Qi Feng; Kenta Ooi

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 305 KB
• Volume: 163
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1994.1088

✦ Synopsis

Spinel-type metal oxides, lithium-aluminum-manganese ox-

(\left.\mathrm{MnO}{4}\right)), were prepared by a coprecipitation/thermal crystallization method. The (\mathrm{Li}^{+})extraction/insertion reactions with these matcrials were investigated by X-ray, DTA-TG analyses, FT-IR spectroscopy, pH titration, and Kd measurement. The acid trcatments of (\mathrm{LiAlMnO}{4}) and (\mathrm{LiFeMnO}_{4}) caused (\mathrm{Li}^{+})extractions of more than (80 %) and (60 %), respectively, while the dissolutions of (\mathrm{AI}, \mathrm{Fe}), and (\mathrm{Mn}) were less than (10 %). The acid-treated samples had lithium ion-sieve propertics from a microamount to a macroamount of metal ion loading in aqueous solutions. The chemical analysis showed that the (\mathrm{Li}^{+})extraction/insertion progressed mainly by an ion-exchange mechanism. The X-ray analyses showed that the spinel structure held during the (\mathrm{Li}^{+})extraction/insertion, indicating the topotactic reaction. (6 1994 Academic Press, Inc.