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MXene/Si@SiO x@C Layer-by-Layer Superstructure with Autoadjustable Function for Superior Stable Lithium Storage.

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ACS Nano
|January 29, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel MXene/Si@SiOx@C anode for lithium-ion batteries (LIBs), significantly improving silicon anode stability and performance. The advanced superstructure enhances capacity retention and reduces electrode swelling for longer battery life.

Keywords:
MXenelayer-by-layer superstructurelithium-ion batteriessilicon anodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Silicon anodes offer high capacity for lithium-ion batteries (LIBs) but suffer from poor cycle life due to significant volume expansion during charging/discharging.
  • This volume change leads to mechanical degradation, electrical contact loss, and rapid capacity fading, limiting practical applications.

Purpose of the Study:

  • To design and fabricate a novel 3D MXene/Si-based superstructure (MXene/Si@SiOx@C) to overcome the limitations of silicon anodes in LIBs.
  • To enhance the electrochemical performance, structural stability, and cycle life of silicon anodes for advanced energy storage applications.

Main Methods:

  • A layer-by-layer fabrication of a 3D superstructure incorporating a MXene matrix, silicon nanoparticles, a silicon oxide (SiOx) protective layer, and nitrogen-doped carbon coating.
  • Electrochemical testing of the MXene/Si@SiOx@C anode in LIBs, including cycling performance, Coulombic efficiency, and electrode swelling measurements.
  • Fabrication and testing of a soft-package full LIB utilizing the developed anode and a NCM622 cathode.

Main Results:

  • The MXene/Si@SiOx@C anode achieved a high reversible capacity of 390 mAh g-1 with excellent capacity retention (76.4% after 1000 cycles at 10 C) and 99.9% Coulombic efficiency.
  • The superstructure effectively suppressed electrode swelling to 12% and prevented mechanical degradation during prolonged cycling.
  • A full LIB demonstrated a stable capacity of 171 mAh g-1 at 0.2 C, a high energy density of 485 Wh kg-1, and good cycling stability, even after bending.

Conclusions:

  • The rational design of the 3D MXene/Si@SiOx@C superstructure provides a robust solution to the volume expansion issue of silicon anodes.
  • This advanced anode material exhibits superior electrochemical performance and structural integrity, positioning it as a highly promising candidate for next-generation LIBs.
  • The developed anode technology holds potential for high-energy-density, long-lasting, and flexible LIB applications.