Kinetics of the Decomposition of LiMn2O4 in Air

Abstract

Abstract: In order to get the decomposition kinetics of LiMn₂O₄ in air, its decomposition process was studied with TG, XRD and H-E integrated equation. The decomposition reaction from 1070K to 1210K is
LiMn₂O₄ (Cubic)→LiMn₂O_4-δ(Orthorhombic) +δ/2O₂(g)↑, which is controlled by nucleating and growing, and the activated energy is 204.16kJ/mol. The reaction from
1210K to 1473K is 3LiMn₂O_4-δ(Orthorhombic)→LiMnO₂+ Mn₃O₄ +Li₂Mn₂O₄+(1-3δ/2)O₂ (g)↑. Nucleating and growing is the key step of
the process from 1210K to 1300K, and its activated energy is 185.61kJ/mol. But the process from 1300K to 1473K is controlled by diffusion, and its activated energy is 208.74kJ/mol. The kinetical compensative effects not
only exist in Arrhenius equation but also in Harcourt-Esson equation.

Key words: lithium-ion batteries, cathode material, LiMn₂O₄, decomposition kinetics

CLC Number:

TM911
O646

WEN Yan-Xuan,ZHOU Kai-Wen,SU Hai-Feng,TONG Zhang-Fa. Kinetics of the Decomposition of LiMn₂O₄ in Air[J]. Journal of Inorganic Materials.

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Kinetics of the Decomposition of LiMn₂O₄ in Air

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