NDLI: The mechanism of Sol-Gel synthesis of normal spinel LiMn$_{2}$O$

Content Provider	Springer Nature Link
Author	Hui, Wu Jia heng, Lei Yong xi, Chen Yu bin, Sun Qi hua, Yuan
Copyright Year	2002
Abstract	The sol-gel process of citric acid chelating with metal cations for the synthesis of normal spinel LiMn$_{2}$O$_{4}$ and the reaction mechanism were investigated by means of XRD, IR, TG-DTA and SEM. The results show that at the beginning lithium citrate and chelate compound of citric acid with manganese ions formed, and then with heating the esterification and condensation reactions occured between them and glycol. The products obtained are polymers in which metal cations are distributed homogenously on atomic scale that ensure high reactivity to cations of Li$^{+}$ and Mn$^{2+}$. Firing the gel prepared by this process, the lattice diffusions of solid reactant ions caused by non-homogeneity of reactants are eliminated and avoided. At 400°C phase-pure LiMn$_{2}$O$_{4}$ with nanometer scale crystallization having precise stoichiometry and perfect crystallization can be obtained. The model of chelate coordinate of double-molecule between citric acid and Mn$^{2+}$ in the gel network is proposed. It is important for explaining the dispersion state of Mn$^{2+}$ and the formation process of gel by this model.
Starting Page	21
Ending Page	24
Page Count	4
File Format	PDF
ISSN	10002413
Journal	Journal of Wuhan University of Technology-Mater. Sci. Ed.
Volume Number	17
Issue Number	4
e-ISSN	19930437
Language	English
Publisher	Wuhan University of Technology
Publisher Date	2002-01-01
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	sol-gel process chelation of citric acid LiMn$_{2}$O$_{4}$ mechanism of reaction Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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