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Title: Revealing the fast and durable Na⁺ insertion reactions in a layered Na₃Fe₃(PO₄)₄ anode for aqueous Na-ion batteries
Authors: Qiu, Shen
Lucero, Marcos
Wu, Xianyong
Wang, Qi
Wang, Maoyu
Wang, Yan
Samarakoon, Widitha S.
Bolding, Meilani R.
Yang, Zhenzhen
Huang, Yaqin
Xu, Zhichuan Jason
Gu, Meng
Feng, Zhenxing
Keywords: Engineering::Materials
Issue Date: 2022
Source: Qiu, S., Lucero, M., Wu, X., Wang, Q., Wang, M., Wang, Y., Samarakoon, W. S., Bolding, M. R., Yang, Z., Huang, Y., Xu, Z. J., Gu, M. & Feng, Z. (2022). Revealing the fast and durable Na⁺ insertion reactions in a layered Na₃Fe₃(PO₄)₄ anode for aqueous Na-ion batteries. ACS Materials Au, 2(1), 63-71.
Journal: ACS Materials Au 
Abstract: Aqueous sodium-ion batteries represent a promising approach for stationary energy storage; however, the lack of appropriate anode materials has substantially retarded their development. Herein, we demonstrated an iron-based phosphate material of Na3Fe3(PO4)4 as an inexpensive and efficacious anode alternative. While the Fe3+/Fe2+ redox couple renders a two-Na-insertion reaction with desirable potentials, its unique layered structure further facilitates the Na-insertion kinetics and reversibility. Consequently, this electrode exhibits an appealing Na-insertion performance, with a reversible capacity of ∼83 mAh g-1, suitable anode potential of -0.4 V vs Ag/AgCl, excellent rate capability of 200 C, and outstanding cycling of 6000 cycles. Utilizing operando synchrotron X-ray diffraction and X-ray absorption spectroscopy, we revealed the structural evolution of the Na3Fe3(PO4)4 anode during the two-electron reaction, where the extremely small volume expansion (∼3%) enables its fast-charging and long-cycling capability. Our work suggests new considerations of developing versatile iron phosphate compounds as appealing anode materials for energy storage in aqueous electrolytes.
ISSN: 2694-2461
DOI: 10.1021/acsmaterialsau.1c00035
Schools: School of Materials Science and Engineering 
Rights: © 2021 The Authors. All rights reserved. This paper was published by American Chemical Society in ACS Materials Au and is made available with permission of the Authors.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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