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

Journal Article


Abstract


  • Benefiting from the abundance of sodium, rechargeable sodium ion batteries (SIBs) are preferred over 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 FeC 6 octahedron lowers the average potential and the overall capacity, while the lattice vacancies and side reactions between low spin Fe and the electrolyte shortens PB's cycling life. Herein, PB with a controllable gradient nickel substitution, which features a high-Ni-content outer layer and low-Ni-content inner layer in a single grain, is demonstrated for high performance sodium storage. The 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 mA h g -1 at 100 mA g -1 and 84 mA h g -1 at 1 A g -1 with very stable cycling for up to 1000 cycles. Gradient substitution in PB analogues provides a novel strategy for exploring high performance PB-based cathodes for SIBs.

Authors


  •   Wang, Baoqi (external author)
  •   Han, Yu (external author)
  •   Chen, Yuting (external author)
  •   Xu, Yanjun (external author)
  •   Pan, Hongge (external author)
  •   Sun, Wenping
  •   Liu, Shuangyu (external author)
  •   Yan, Mi (external author)
  •   Jiang, Yinzhu (external author)

Publication Date


  • 2018

Citation


  • Wang, B., Han, Y., Chen, Y., Xu, Y., Pan, H., Sun, W., Liu, S., Yan, M. & Jiang, Y. (2018). Gradient substitution: An intrinsic strategy towards high performance sodium storage in Prussian blue-based cathodes. Journal of Materials Chemistry A, 6 (19), 8947-8954.

Scopus Eid


  • 2-s2.0-85047198519

Number Of Pages


  • 7

Start Page


  • 8947

End Page


  • 8954

Volume


  • 6

Issue


  • 19

Place Of Publication


  • United Kingdom

Abstract


  • Benefiting from the abundance of sodium, rechargeable sodium ion batteries (SIBs) are preferred over 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 FeC 6 octahedron lowers the average potential and the overall capacity, while the lattice vacancies and side reactions between low spin Fe and the electrolyte shortens PB's cycling life. Herein, PB with a controllable gradient nickel substitution, which features a high-Ni-content outer layer and low-Ni-content inner layer in a single grain, is demonstrated for high performance sodium storage. The 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 mA h g -1 at 100 mA g -1 and 84 mA h g -1 at 1 A g -1 with very stable cycling for up to 1000 cycles. Gradient substitution in PB analogues provides a novel strategy for exploring high performance PB-based cathodes for SIBs.

Authors


  •   Wang, Baoqi (external author)
  •   Han, Yu (external author)
  •   Chen, Yuting (external author)
  •   Xu, Yanjun (external author)
  •   Pan, Hongge (external author)
  •   Sun, Wenping
  •   Liu, Shuangyu (external author)
  •   Yan, Mi (external author)
  •   Jiang, Yinzhu (external author)

Publication Date


  • 2018

Citation


  • Wang, B., Han, Y., Chen, Y., Xu, Y., Pan, H., Sun, W., Liu, S., Yan, M. & Jiang, Y. (2018). Gradient substitution: An intrinsic strategy towards high performance sodium storage in Prussian blue-based cathodes. Journal of Materials Chemistry A, 6 (19), 8947-8954.

Scopus Eid


  • 2-s2.0-85047198519

Number Of Pages


  • 7

Start Page


  • 8947

End Page


  • 8954

Volume


  • 6

Issue


  • 19

Place Of Publication


  • United Kingdom