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Gradient substitution: an intrinsic strategy towards high performance sodium storage in Prussian blue-based cathodes

Abstract

Benefitted from the abundant resource of sodium, rechargeable sodium ion batteries (SIBs) are preferable to lithium ion batteries (LIBs) in large-scale storage of electrical energy. Low-cost Prussian blue (PB) is a promising cathode because of its ease of synthesis and rigid open framework. Nevertheless, the less activated low spin Fe in FeC6 octahedron drags down the average potential and whole capacity, while the lattice vacancies and side reactions between the low spin Fe and electrolyte shortens PB’s cycling life. Herein, PB with controllable gradient nickel substitution is demonstrated for high performance sodium storage, which is featured by high-Ni-content outer layer and low-Ni-content inner layer in a single grain. High-Ni-content outer layer efficiently prevents side reactions ensuring excellent cycling stability, while a small amount of nickel ions in the inner layer efficiently activates the low spin Fe for achieving high capacity. Taking the above synergistic advantages, our gradient-PB exhibits a high reversible capacity of 114 mAh g-1 at 100 mA g-1 and 84 mAh g-1 at 1 A g-1 with very stable cycling up to 1000 cycles. Gradient substitution in PB analogues provides a novel strategy for exploring high performance PB-based cathodes for SIBs.

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Publication details

The article was received on 11 Mar 2018, accepted on 12 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA02291G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Gradient substitution: an intrinsic strategy towards high performance sodium storage in Prussian blue-based cathodes

    B. Wang, Y. Han, Y. Chen, Y. Xu, H. Pan, W. Sun, S. Liu, M. Yan and Y. Jiang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02291G

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