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SmFeO3 and Bi-doped SmFeO3 perovskites as an alternative class of electrodes in lithium-ion batteries

Abstract

The search of new electrodes in alkali-ion batteries requires investigation of a variety of classes of materials, each showing subtly different crystal structure motifs or frameworks. The structure-electrochemistry of the SmFeO3 and Sm0.92(2)Bi0.08(2)FeO3 electrode materials are characterized by in situ and ex situ X-ray diffraction (XRD), galvanotactic charge/discharge cycling and electrochemical impedance spectroscopy. SmFeO3 and Sm0.92(2)Bi0.08(2)FeO3 electrodes deliver first discharge capacities of 450 and 550 mA h g−1 and their corresponding reversible discharge capacities are 300 and 400 mA h g−1, respectively following this cycle at a current rate of 5 mA g-1. Interestingly, after the 20th cycle SmFeO3 retains 98% of its capacity from previous cycles whereas the Bi-doped SmFeO3 appears to lose capacity extremely fast. In situ synchrotron XRD data suggests that discharge results in a partial loss of crystallinity, while charge slightly recovers crystallinity for SmFeO3 but not for Bi-doped SmFeO3, which is also confirmed by ex situ XRD data. The lack of crystallinity recovery could be related to the poor higher rate performance observed for this doping regime. This work shows the potential of this class of materials as electrode materials, unconventional but possibly reliable.

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Publication details

The article was received on 13 May 2018, accepted on 27 Jul 2018 and first published on 28 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00780B
Citation: CrystEngComm, 2018, Accepted Manuscript
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    SmFeO3 and Bi-doped SmFeO3 perovskites as an alternative class of electrodes in lithium-ion batteries

    J. Liu, E. Sheha, S.I. El-dek, D. Goonetilleke, M. Harguindeguy and N. Sharma, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00780B

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