Degradation Mechanism of Conversion-Type Iron Trifluoride: Toward Improvement of Cycle Performance

Conversion-type iron trifluoride (FeF3) has attracted considerable attention as a positive electrode material for lithium secondary batteries due to its high energy density and low cost. However, the conversion process through which FeF3 operates leads it to suffer from capacity degradation upon rep...

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Veröffentlicht in:ACS applied materials & interfaces 2019-08, Vol.11 (34), p.30959-30967
Hauptverfasser: Senoh, Hiroshi, Matsui, Keitaro, Shikano, Masahiro, Okumura, Toyoki, Kiuchi, Hisao, Shimoda, Keiji, Yamanaka, Keisuke, Ohta, Toshiaki, Fukunaga, Toshiharu, Sakaebe, Hikari, Matsubara, Eiichiro
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container_end_page 30967
container_issue 34
container_start_page 30959
container_title ACS applied materials & interfaces
container_volume 11
creator Senoh, Hiroshi
Matsui, Keitaro
Shikano, Masahiro
Okumura, Toyoki
Kiuchi, Hisao
Shimoda, Keiji
Yamanaka, Keisuke
Ohta, Toshiaki
Fukunaga, Toshiharu
Sakaebe, Hikari
Matsubara, Eiichiro
description Conversion-type iron trifluoride (FeF3) has attracted considerable attention as a positive electrode material for lithium secondary batteries due to its high energy density and low cost. However, the conversion process through which FeF3 operates leads it to suffer from capacity degradation upon repeated cycling. To improve the cycle performance, in this study we investigated the degradation mechanism of conversion-type FeF3 electrode material. Bulk analyses of FeF3 upon cycling reveal incomplete oxidation to Fe3+ concomitant with the aggregation of LiF at the charged state. In addition, surface analyses of FeF3 reveal that a film covered the electrode surface after 10 cycles, which leads to a remarkable increase in resistance. We show that the choice of the electrolyte formulation is crucial in preventing the formation of the film on the electrode surface; thus, FeF3 shows better performance in an electrolyte comprising LiBF4 solute in cyclic carbonate solvents than in chain carbonate-containing LiPF6 as the electrolyte. This study underpins that a careful selection of solvent, rather than solute, is significantly essential to improve the cycle performance of the FeF3 electrode.
doi_str_mv 10.1021/acsami.9b10105
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title Degradation Mechanism of Conversion-Type Iron Trifluoride: Toward Improvement of Cycle Performance
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