In situ XRD study of Li deintercalation from two different types of LiMn2O4 spinel

E. Levi, M. D. Levi, G. Salitra, D. Aurbach, R. Oesten, U. Heider, L. Heider

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A mechanism of the capacity loss in LiMn2O4 was studied by comparison of two types of spinel with different morphologies and specific surface areas (2.9 and 0.8 m2 g-1). The combination of SSCV and in situ XRD techniques shows that the irreversible structural conversion occurs partially in spinel of the low specific surface area during the first Li deintercalation at a potential 4.0 V. This conversion is mainly responsible for the capacity loss in this type of spinel. It seems that these peculiarities of the electrochemical behavior are related to the presence of the layered component in this material. In contrast, spinel of the high specific surface area presents an example of a stable material without considerable variation of its capacity and XRD patterns after long-term cycling. This type of spinel demonstrates two distinct phase transitions in the vicinity of 4.0-4.1 V, corresponding to two SSCV peaks.

Original languageEnglish
Pages (from-to)109-119
Number of pages11
JournalSolid State Ionics
Issue number1
StatePublished - 1 Nov 1999

Bibliographical note

Funding Information:
We are grateful to Dr B. Markovsky and K. Gamulsky for their assistance in performing several electrochemical experiments. Partial financial support for this study was obtained from Merck KGaA. The authors thank Dr Shifra Hochberg for editorial assistance.


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