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Holey Ti3C2 MXene-Derived Anode Enables Boosted Kinetics in Lithium-Ion Capacitors.

Hang-Yu Zhou1,2, Liang-Wen Lin1,2, Zhu-Yin Sui3

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.

ACS Applied Materials & Interfaces
|February 22, 2023
PubMed
Summary

Researchers developed a novel composite anode from holey Ti3C2 MXene for lithium-ion capacitors (LICs). This material enhances energy and power density by improving lithium-ion kinetics and stability, crucial for advanced energy storage devices.

Keywords:
anode materialfast ion diffusion kineticsholey Ti3C2 MXenein-plane poreslithium-ion capacitors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Lithium-ion capacitors (LICs) are crucial for high power and energy density devices.
  • Current LICs face limitations due to anode-cathode imbalances, hindering performance improvements.
  • MXenes offer unique properties for electrochemical energy storage.

Purpose of the Study:

  • To develop a novel anode material for LICs with enhanced kinetics and electrochemical properties.
  • To address the limitations of existing anode materials in LICs.
  • To explore the potential of modified MXenes in advanced energy storage applications.

Main Methods:

  • Synthesized a holey Ti3C2 MXene-derived composite (pTi3C2/C) as an anode material.
  • Characterized the material's structure, focusing on reduced surface groups and expanded interplanar spacing.
  • Evaluated the electrochemical performance of the pTi3C2/C anode in LICs.

Main Results:

  • The pTi3C2/C anode exhibited accelerated lithium-ion diffusion kinetics due to in-plane pores and increased active sites.
  • Achieved excellent electrochemical properties, including approximately 80% capacity retention after 2000 cycles.
  • LICs with the pTi3C2/C anode demonstrated a maximum energy density of 110 Wh kg-1 and 71 Wh kg-1 at 4673 W kg-1.

Conclusions:

  • The proposed holey Ti3C2 MXene composite is an effective anode for high-performance LICs.
  • Structural modification of MXenes enhances electrochemical properties and device stability.
  • This work offers a new strategy for designing MXene-based materials for advanced energy storage.