Discharge and Charge Reaction of Perovskite-type <i>M</i>F<sub>3</sub> (<i>M</i> = Fe and Ti) Cathodes for Lithium-ion Batteries

Ayuko Kitajou, Ichiro Tanaka, Yo Tanaka, Eiji Kobayashi, Hiroyuki Setoyama, Toshihiro Okajima, Shigeto Okada

Research output: Contribution to journalArticle

Abstract

Conversion-type cathode materials such as perovskite-type <i>M</i>F<sub>3</sub> (<i>M</i> = Fe and Ti) show promise for use in large-scale lithium-ion batteries by virtue of their low cost and large specific capacities. However, the FeF<sub>3</sub> cathode shows a large overpotential during discharge-charge cycles, such that the rechargeable capacity is almost gone after a few cycles. To overcome this drawback, we elucidated the detailed mechanism of the deterioration of the rechargeable capacity for the FeF<sub>3</sub> cathode. In the initial cycle, the cathode returned to the initial FeF<sub>3</sub> structure from LiF and Fe. However, the diffraction peak of LiF and Fe after the 20th cycle was sharper than that after the initial discharge state; that is, the growth of the LiF and Fe crystal contributed to the lower cyclability of FeF<sub>3</sub>. On the other hand, the TiF<sub>3</sub> cathode showed an initial discharge/charge capacity of 730/620 mAh g<sup>−1</sup> between 0.5 and 4.0 V, and the discharge-charge overpotential of TiF<sub>3</sub> was still smaller than that of FeF<sub>3</sub>. In addition, the cyclability of the TiF<sub>3</sub> cathode were better than that of the FeF<sub>3</sub> cathode, not only in insertion reaction region, but also in conversion reaction region.
Original languageEnglish
Pages (from-to)472-477
Number of pages6
JournalElectrochemistry
Volume85
Issue number8
DOIs
Publication statusPublished - 2017

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