4.8 Article

Evolution of a solid electrolyte interphase enabled by FeNX/C catalysts for sodium-ion storage

Journal

ENERGY & ENVIRONMENTAL SCIENCE
Volume 15, Issue 2, Pages 771-779

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ee02810c

Keywords

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Funding

  1. National Key R&D Program of China [2016YFA0204100, 2016YFA0200200]
  2. National Natural Science Foundation of China [21875221, 21988101, 21890753, 22162026]
  3. Strategic Priority Research Program of Chinese Academy of Sciences [XDB36030200]
  4. Danish company Haldor TopsOe A/S
  5. Youth Talent Support Program of High-Level Talents Special Support Plan in Henan Province [ZYQR201810148]
  6. Creative Talents in the Education Department of Henan Province [19HASTIT039]

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The structure and chemical engineering of SEI have a vital role in rechargeable batteries, with FeNX/C anodes providing high capacity through mechanisms such as catalyzing reversible conversion of SEIs and storing spin-polarized charges. The FeNX species open novel avenues for the design of conversion-type electrode materials.
The structure and chemical engineering of a solid electrolyte interphase (SEI) play a vital role in rechargeable batteries. The underlying correlation between the properties of the enhanced sodium (Na) ion storage and SEIs in metal-nitrogen (MNX) platform electrodes was not revealed during charging and discharging cycles. Herein, the capacity enhancement of FeNX/C anodes was first clarified by employing in situ temperature-dependent Nyquist plots and ex situ X-ray photoelectron spectroscopy. It was evidenced that physiochemical evolution of the SEI and surface carbonaceous materials made a significant contribution to the improved sodium storage performance through the following three mechanisms: (1) FeNX catalyzed the reversible conversion of SEIs, beneficial to the storage and release of extra Na ions, (2) a large number of spin-polarized charges were stored on the surface of the reduced Fe species, and (3) the carbon delivered additional capacity through the surface-capacitive effects. As a result, the FeNX/C anode provided a high capacity of 217 mA h g(-1) after 1000 cycles at 2000 mA g(-1). Therefore, the FeNX species catalyzed the reversible conversion reaction of SEIs, which contributed novel avenues to the design of conversion-type electrode materials.

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