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Electrochemical Reactions of Iron Borates with Lithium: Electrochemical and in Situ Mössbauer and X-ray Absorption Studies

By Alejandro Ibarra-Palos, C. Darie, Olivier Proux, J. Hazemann, L. Aldon, C. Jumas, Mathieu Morcrette and P. Strobel


International audienceUpon electrochemical reduction in a lithium cell, crystalline FeBO3 and Fe3BO6 give amorphous compounds, which can be cycled reversibly at low potential (Rowsell, J. Power Sources2001, 97−98, 254). We report here capacities as high as 300 Ah/kg at the 14th cycle. The mechanism of reaction was investigated by step-potential electrochemical spectroscopy and in situ Mössbauer and X-ray absorption spectroscopies on electrochemical cells encapsulated in thin sealed plastic bags. These techniques confirm the reduction mechanism consisting of the early destruction of the crystallized borates and a direct FeIII−Fe0 multiphase reduction on first discharge. On recharge and subsequent cyclings, a reversible redox reaction occurs between Fe0 and FeII/III in an amorphous or nanocrystalline matrix

Topics: [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Publisher: 'American Chemical Society (ACS)'
Year: 2002
DOI identifier: 10.1021/cm010694q
OAI identifier: oai:HAL:hal-02177295v1
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