Synthesis of orthorhombic LiMnO2 by solid-phase reaction under steam atmosphere and a study of its heat and acid-treated phases

被引：48

作者：

Chitrakar, R ^{[1
]}

Sakane, K ^{[1
]}

Umeno, A ^{[1
]}

Kasaishi, S ^{[1
]}

Takagi, N ^{[1
]}

Ooi, K ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Inst Marine Resources & Environm, AIST Shikoku, Takamatsu, Kagawa 7610395, Japan

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2002年 / 169卷 / 01期

关键词：

solid-phase reaction; orthorhombic lithium manganese oxide; morphology;

D O I：

10.1016/S0022-4596(02)00018-X

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Low crystalline orthorhombic LiMnO2 (o-LiMnO2) samples were synthesized by reacting either gamma-MnOOH or Mn2O3 with LiOH . H2O in the solid phase under steam atmosphere at 120degreesC. In the closed system, the vapor arising from LiOH . H2O may strengthen the reactivity of LiOH at the surface of MnOOH or Mn2O3 particles, which may enable slow diffusion of Li+ ions forming LiMnO2. These samples were compared with crystalline o-LiMnO2 prepared by a solid-state reaction method at 700degreesC in nitrogen gas. The powder X-ray diffraction patterns of low crystalline samples after heating at 400degreesC in air revealed the formation of a single phase of cubic Li1.6Mn1.6O4, but the crystalline sample revealed a mixed phase of o-LiMnO2 and LiMn2O4 after heating at 400degreesC in air. The Li+/H+ exchange in the Li1.6Mn1.6O4 sample progressed topotactically, while maintaining the crystal structure and morphology of the precursor. But heat-treated crystalline o-LiMnO2 showed a disproportionation reaction with dissolution of Mn2+ ions. (C) 2002 Elsevier Science (USA). All rights reserved.

引用

页码：66 / 74

页数：9

共 36 条

[31] Synthesis of LiMnO2 with α-NaMnO2-type structure by a mixed-alkaline hydrothermal reaction [J].