Electrochemical splitting of LiF: A new approach to lithium-ion battery materials

N. Dimov, A. Kitajou, H. Hori, E. Kobayashi, S. Okada

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Abstract

Composites of LiF and lithium-free manganese compounds (MnF2 and MnOx) were prepared by high-energy ball milling and their electrochemical activities as cathode were investigated. Within the voltage range of 1.5-4.8 V, MnOx/LiF composites exhibited reversible reactivity with a sloping voltage profile, while MnF2/LiF composites showed no reactivity. Reversible Li+ extraction from the MnO x/LiF composites was observed in a full cell configuration with graphite anode, where total Li+ balance was monitored by chemical analysis of the anode and the cathode. Exsitu X-ray diffraction and X-ray absorption fine structure (XAFS) experiments further confirmed that during the first charge LiF is split electrochemically and the Mn oxidation state changes accordingly, but the MnOx/LiF remained amorphous. Composites containing the redox oxide and the lithium compound as two separate solid phases could be used as a source of Li+ and it offers a new type of cathode materials for lithium-ion batteries.

Original languageEnglish
Pages (from-to)87-99
Number of pages13
JournalECS Transactions
Volume58
Issue number12
DOIs
Publication statusPublished - Jan 1 2013

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

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