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Layered perovskite LiEuTiO4 as a 0.8 V lithium intercalation electrode

Abstract

The ~1 V lithium intercalation materials are promising anodes for lithium-ion batteries, because such materials give consideration to both tolerance of ltihum plating (e.g., graphite with ~0.1 V versus Li+/Li easily results in lithium plating due to too low potential) and energy density of batteries (e.g., Li4Ti5O12 with ~1.55 V lowers battery voltage, and thus reduces energy density). Herein, the layered perovskite compound LiEuTiO4 with a 0.8 V lithium intercalation/ deintercalation potential plateau was successfully synthesized by the ion-exchange reaction with NaEuTiO4 prepared via sol-gel method. LiEuTiO4 can deliver a high capacity of 219.2 mAhg-1 (2nd discharge) at a rate of 100 mAg-1. Even after 500 cycles, the discharge capacity remains ~217 mAhg-1 and the coulombic efficiency is 99.2%. To our knowledge, the cycle stability of LiEuTiO4 exceeds all previous ~1 V electrodes. Different from the common lithium intercalation Ti-based electrodes (such as Li4Ti5O12) with reducing the Ti4+ to Ti3+, electrochemical lithium intercalation into LiEuTiO4 leads to the reduction of the Eu3+ to Eu2+.

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Publication details

The article was received on 21 May 2017, accepted on 15 Jun 2017 and first published on 16 Jun 2017


Article type: Communication
DOI: 10.1039/C7CC03933F
Citation: Chem. Commun., 2017, Accepted Manuscript
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    Layered perovskite LiEuTiO4 as a 0.8 V lithium intercalation electrode

    J. Huang, K. Yang, Z. Zhang, L. Yang and S. Hirano, Chem. Commun., 2017, Accepted Manuscript , DOI: 10.1039/C7CC03933F

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