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Atomic Cobalt Covalently Engineered Interlayers for Superior Lithium-Ion Storage.

Changda Wang1, Hui Xie1, Shuangming Chen1

  • 1National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui, 230029, P. R. China.

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Engineered vanadium carbide (V2 C) MXene with tuned interlayer spacing significantly boosts lithium-ion (Li+) storage capacity. Cobalt ion intercalation further enhances performance and cycling stability for advanced energy storage applications.

Keywords:
Li-ion storageXANESatomic cobalt covalenceinterlayer spacing engineerlayered materials

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • MXenes possess unique layered structures, showing promise for energy storage devices like lithium-ion (Li+) capacitors and batteries.
  • Current MXene applications are limited by their low lithium-ion storage capacity compared to commercial carbon materials.

Purpose of the Study:

  • To engineer vanadium carbide (V2 C) MXene with tailored interlayer spacing to enhance lithium-ion storage capacity.
  • To investigate the effect of cobalt ion intercalation on the electrochemical performance and stability of V2 C MXene.

Main Methods:

  • Controlled tuning of the interlayer distance in V2 C MXene to 0.735 nm.
  • Stable intercalation of cobalt ions into the interlayer of V2 C MXene, forming a new V-O-Co bonding structure.

Main Results:

  • Pristine V2 C MXene achieved a Li+-storage capacity of 686.7 mA h g-1 at 0.1 A g-1, the highest reported for MXene-based materials.
  • Cobalt-intercalated V2 C MXene exhibited a superior capacity of 1117.3 mA h g-1 at 0.1 A g-1.
  • The intercalated V2 C MXene demonstrated ultralong cycling stability exceeding 15,000 cycles.

Conclusions:

  • Engineering interlayer spacing in MXene materials is a viable strategy for developing high-performance lithium-ion capacitor electrodes.
  • Cobalt ion intercalation into V2 C MXene significantly improves both energy storage capacity and long-term cycling stability.
  • Modified MXenes offer a promising pathway towards next-generation, stable, and high-capacity energy storage solutions.