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Cyclic voltammetric study on stoichiometric spinel LiMn2O4 electrode at elevated temperature by Shuhua Ma; Hideyuki Noguchi; Masaki Yoshio is a Engineering article available to read on EtoBox.

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The high-temperature electrochemical cell behavior of Li-stoichiometric Li±Mn±O spinel material, LiMn 2 O 4.014 , has been studied by cyclic voltammetry and coulometric titration curve measurement methods. A split of the reduction peak at x > 0:5, in Li x Mn 2 O 4.014 , during Li insertion was found at 858C. Correspondingly, three plateaus appeared in its coulometric titration curve, which manifest itself as three peaks in dQ/dV±V plot. The peak split phenomenon was also found for oxygen de®cient spinel, LiMn 2 O 3.986 , prepared at 9008C in both reduction and oxidation branches at room and elevated temperatures using a lower scan rate of 0.02 mV/s. The disproportionation dissolution of stoichiometric spinel LiMn 2 O 4.014 intensi®ed by the elevated temperature in slightly acidic electrolyte is considered responsible for the occurrence of the phenomenon. The ®nding gives a piece of evidence for oxygen de®cient spinel LiMn 2 O 4Àz as the insoluble product of disproportionation dissolution.

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Author

Shuhua Ma; Hideyuki Noguchi; Masaki Yoshio

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0378-7753)

Published

2001

Language

EN

Field

Engineering (Physical Sciences)