HYDROTHERMAL SYNTHESIS OF LITHIUM AND SODIUM MANGANESE OXIDES AND THEIR METAL-ION EXTRACTION INSERTION REACTIONS

被引：168

作者：

FENG, Q ^{[1
]}

KANOH, H ^{[1
]}

MIYAI, Y ^{[1
]}

OOI, K ^{[1
]}

机构：

[1] SHIKOKU NATL IND RES INST, TAKAMATSU 76103, KAGAWA, JAPAN

来源：

CHEMISTRY OF MATERIALS | 1995年 / 7卷 / 06期

关键词：

D O I：

10.1021/cm00054a024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Spinel-type lithium manganese oxide (LMO) and birnessite-type sodium manganese oxide (NMO) were prepared by hydrothermal treatment of gamma-MnO2 with LiOH and NaOH solutions, respectively. The extraction/insertion reactions of the alkali-metal ions with the manganese oxides were investigated by chemical, X-ray, DTA-TG analyses, FT-IR spectroscopy, pH titration, and K-d measurements. Li+ and Na+ were topotactically extracted from LMO and NMO, respectively, by two different mechanisms: redox-type and ion-exchange-type reactions. The pH titration studies indicated that the acid-treated LMO (LMO(H)) has a remarkably larger adsorptive capacity for Li+ than those for the other alkali-metal ions. The acid-treated NMO (NMO(H)) showed tetrabasic acid behavior toward Li+, but monobasic acid behavior toward the other alkali-metal ions. A new model was proposed for the insertion reaction of alkali-metal ions with NMO(H). LMO(H) and NMO(H) showed ion-sieve properties for the adsorption of alkali-metal ions. The K-d measurements suggested that the effective pore radii of the ion sieves are about 0.7 Angstrom for LMO(H) and 1.5 Angstrom for NMO(H).

引用

页码：1226 / 1232

页数：7

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