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Title: Thermal stability and structural changes of Li{sub 4}Mn{sub 5}O{sub 12} under oxygen and nitrogen atmosphere

Abstract

The thermal stability and structural changes of well-crystallized Li{sub 4}Mn{sub 5}O{sub 12} powder with a grain size of 0.1-0.3 {mu}m have been investigated with thermogravimetric analysis (TGA), X-ray diffraction (XRD), and high-temperature X-ray diffraction measurements (HT-XRD). Li{sub 4}Mn{sub 5}O{sub 12} crystallites are stable at temperatures up to 600{degrees}C in oxygen or air, but decompose to spinel LiMn{sub 2}O{sub 4} and monoclinic Li{sub 2}MnO{sub 3} at temperatures between 530 and 680{degrees}C, and to LiMnO{sub 2} and Mn{sub 3}O{sub 4} at temperatures above 680{degrees}C in nitrogen. No apparent structural change was detected with XRD and HT-XRD when Li{sub 4}Mn{sub 5}O{sub 12} was heated in O{sub 2} up to 700{degrees}C, but a reversible weight loss/gain due to the evolution/uptake or oxygen was observed by TGA between 400-700{degrees} C. The deficiency of oxygen in Li{sub 4}Mn{sub 3}O{sub 12-{delta}} is found to be in the region 0<{delta}< 0.5.

Authors:
; ;  [1]
  1. National Inst. of Materials and Chemical Research, Tsukuba (Japan) [and others
Publication Date:
OSTI Identifier:
223710
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 121; Journal Issue: 1; Other Information: PBD: 5 Jan 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; LITHIUM OXIDES; PHASE TRANSFORMATIONS; MANGANESE OXIDES; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION; MONOCLINIC LATTICES; STABILITY; GRAIN SIZE; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K

Citation Formats

Takada, Toshimi, Hayakawa, Hiroshi, and Kumagai, Toshiya. Thermal stability and structural changes of Li{sub 4}Mn{sub 5}O{sub 12} under oxygen and nitrogen atmosphere. United States: N. p., 1996. Web. doi:10.1006/jssc.1996.0012.
Takada, Toshimi, Hayakawa, Hiroshi, & Kumagai, Toshiya. Thermal stability and structural changes of Li{sub 4}Mn{sub 5}O{sub 12} under oxygen and nitrogen atmosphere. United States. doi:10.1006/jssc.1996.0012.
Takada, Toshimi, Hayakawa, Hiroshi, and Kumagai, Toshiya. Fri . "Thermal stability and structural changes of Li{sub 4}Mn{sub 5}O{sub 12} under oxygen and nitrogen atmosphere". United States. doi:10.1006/jssc.1996.0012.
@article{osti_223710,
title = {Thermal stability and structural changes of Li{sub 4}Mn{sub 5}O{sub 12} under oxygen and nitrogen atmosphere},
author = {Takada, Toshimi and Hayakawa, Hiroshi and Kumagai, Toshiya},
abstractNote = {The thermal stability and structural changes of well-crystallized Li{sub 4}Mn{sub 5}O{sub 12} powder with a grain size of 0.1-0.3 {mu}m have been investigated with thermogravimetric analysis (TGA), X-ray diffraction (XRD), and high-temperature X-ray diffraction measurements (HT-XRD). Li{sub 4}Mn{sub 5}O{sub 12} crystallites are stable at temperatures up to 600{degrees}C in oxygen or air, but decompose to spinel LiMn{sub 2}O{sub 4} and monoclinic Li{sub 2}MnO{sub 3} at temperatures between 530 and 680{degrees}C, and to LiMnO{sub 2} and Mn{sub 3}O{sub 4} at temperatures above 680{degrees}C in nitrogen. No apparent structural change was detected with XRD and HT-XRD when Li{sub 4}Mn{sub 5}O{sub 12} was heated in O{sub 2} up to 700{degrees}C, but a reversible weight loss/gain due to the evolution/uptake or oxygen was observed by TGA between 400-700{degrees} C. The deficiency of oxygen in Li{sub 4}Mn{sub 3}O{sub 12-{delta}} is found to be in the region 0<{delta}< 0.5.},
doi = {10.1006/jssc.1996.0012},
journal = {Journal of Solid State Chemistry},
number = 1,
volume = 121,
place = {United States},
year = {Fri Jan 05 00:00:00 EST 1996},
month = {Fri Jan 05 00:00:00 EST 1996}
}