Structure and electrochemical performance of the spinel-LiMn₂O₄ synthesized by mechanical alloying

Highlights

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Spinel LiMn₂O₄ for cathode material in lithium rechargeable batteries were synthesized by mechanical alloying (MA) using LiOH.H₂O and MnO_x.

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Structural analysis shows that the spinel is fit to space group Fd-3m.

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It revealed the lost of oxygen during MA process and lead to the decreasing average Mn valence. The lost of oxygen increases with increasing MA time.

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The results from electrochemical study show that the stoichiometry of the spinel is closely related to the decreasing of initial discharge capacity and cyclic performance of the spinel.

Abstract

In this work, spinel LiMn₂O₄ powder was synthesized from LiOH·H₂O and MnO_x by mechanical alloying (MA) for various MA times. The stoichiometry and crystal structure of the spinel were examined and their relation to the electrochemical behavior of the spinel was investigated. In this study, we find that, as a result of MA using stainless steel jar and balls, Fe and Cr contents increased and O content decreased with increasing MA time. The results from electrochemical study show that the stoichiometry of the spinel is closely related to the decreasing of initial discharge capacity and cyclic performance of the spinel.