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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/551

Title: Synthesis of lithium-manganese-oxide spinels: A study by thermal analysis
Authors: Thackeray, MM
Rossouw, MH
Keywords: Lithium-manganese-oxide compounds
Thermogravimetric analysis
Stoichiometric spinel
Physical chemistry
Issue Date: Dec-1994
Publisher: Academic Press Inc
Citation: Thackeray, MM and Rossouw, MH. 1994. Synthesis of lithium-manganese-oxide spinels: A study by thermal analysis. Journal of Solid State Chemistry, vol 113(2), pp 441-443
Abstract: The synthesis of lithium-manganese-oxide spinels by reaction of Li2CO3 and MnCO3 in air and under nitrogen to T(max) = 600°C has been investigated by thermogravimetric analysis and differential scanning calorimetry. When the reaction is conducted in air, the stoichiometric spinel LiMn2O4 is produced via a series of intermediate ''oxygen-rich,'' defect spinel compounds XLi1-xMn2-2xO4 (0 < = X < = 0.11), whereas under nitrogen the reaction proceeds more directly to LiMn2O4. The study has demonstrated that lithium-manganese-oxide spinel compounds that fall within the solid solution range XLi1-xMn2-2xO4 (0 < = X < = 0.11) can be synthesized by reaction of MnCO3 and Li2CO3 in air at moderate temperatures. It is difficult, however, to control the reaction parameters, for example, temperature and time, to produce a spinel compound with a predetermined stoichiometry. The study has, however, illustrated that the stoichiometric spinel LiMn2O4 can be produced at a moderately low temperature (less than 500°C) by performing the reaction under nitrogen. This result has commercial implications for the production of LiMn2O4 which, in the past, has been conventionally synthesized in air at higher temperatures, for example, 700-850°C
Description: Copyright: 1994 Academic Press Inc
URI: http://hdl.handle.net/10204/551
ISSN: 0022-4596
Appears in Collections:Metal and metal processes
General science, engineering & technology

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