Thermal stability of Li{sub 4}Mn{sub 5}O{sub 12} electrodes for lithium batteries
- Argonne National Lab., IL (United States)
The thermal stability of the spinel, Li{sub 4}Mn{sub 5}O{sub 12}, which is of interest as an insertion electrode for 3 V lithium cells, has been studied by X-ray diffraction, differential thermal analysis, and thermogravimetric analysis at temperatures up to 1020{degrees}C. The data show that as the temperature is raised above 400{degrees}C, oxygen and lithia (Li{sub 2}O) are lost from the structure, which drives the composition of the spinel along the stoichiometric spinel tie-line form Li{sub 4}Mn{sub 5}O{sub 12} toward Mn{sub 3}O{sub 4}. By-products of the reaction are the rock-salt phases Li{sub 2}MnO{sub 3} at moderate temperature and LiMnO{sub 2} at high temperature. The data are consistent with recent reports of the behavior of other lithium-manganese-oxide spinels; the data highlight, in particular, the sensitivity of lithium-rich spinels to temperatures above 400{degrees}C.
- OSTI ID:
- 486253
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 125; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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