Bridging multiscale interfaces for developing ionically conductive high-voltage iron sulfate-containing sodium-based battery positive electrodes

Jiyu Zhang, Yongliang Yan, Xin Wang, Yanyan Cui, Zhengfeng Zhang, Sen Wang, Zhengkun Xie, Pengfei Yan and Weihua Chen ()
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Jiyu Zhang: Zhengzhou University
Yongliang Yan: Zhengzhou University
Xin Wang: Zhengzhou University
Yanyan Cui: Karlsruhe Institute of Technology (KIT)
Zhengfeng Zhang: Beijing University of Technology
Sen Wang: Zhengzhou University
Zhengkun Xie: Zhengzhou University
Pengfei Yan: Beijing University of Technology
Weihua Chen: Zhengzhou University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Non-aqueous sodium-ion batteries (SiBs) are a viable electrochemical energy storage system for grid storage. However, the practical development of SiBs is hindered mainly by the sluggish kinetics and interfacial instability of positive-electrode active materials, such as polyanion-type iron-based sulfates, at high voltage. Here, to circumvent these issues, we proposed the multiscale interface engineering of Na2.26Fe1.87(SO4)3, where bulk heterostructure and exposed crystal plane were tuned to improve the Na-ion storage performance. Physicochemical characterizations and theoretical calculations suggested that the heterostructure of Na6Fe(SO4)4 phase facilitated ionic kinetics by densifying Na-ion migration channels and lowering energy barriers. The (11-2) plane of Na2.26Fe1.87(SO4)3 promoted the adsorption of the electrolyte solution ClO4− anions and fluoroethylene carbonate molecules, which formed an inorganic-rich Na-ion conductive interphase at the positive electrode. When tested in combination with a presodiated FeS/carbon-based negative electrode in laboratory- scale single-layer pouch cell configuration, the Na2.26Fe1.87(SO4)3-based positive electrode enables an initial discharge capacity of about 83.9 mAh g−1, an average cell discharge voltage of 2.35 V and a specific capacity retention of around 97% after 40 cycles at 24 mA g−1 and 25 °C.

Date: 2023
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DOI: 10.1038/s41467-023-39384-7

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