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Solution processable Si/Ge heterostructure NWs enabling anode mass reduction for practical full-cell Li-ion

Temilade Esther Adegoke1, Syed Abdul Ahad1, Ursel Bangert2

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We synthesized silicon-germanium (SiGe) nanowire anodes for lithium-ion batteries. These anodes offer a 2.8x capacity increase over graphite, enabling significant mass reduction in full cells.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing high-performance anode materials is crucial for advancing lithium-ion battery (LIB) technology.
  • Silicon and germanium (SiGe) alloys show promise due to their high theoretical capacities, but practical applications are hindered by volume expansion issues.
  • Scalable synthesis methods are needed for commercial viability.

Purpose of the Study:

  • To report the solution-phase synthesis of axial heterostructure silicon-germanium (hSG) nanowires (NWs).
  • To evaluate the electrochemical performance of hSG NWs as anodes in LIBs.
  • To investigate the structural evolution and lithiation/delithiation mechanisms of hSG NW anodes.

Main Methods:

  • Solution-phase synthesis of hSG NWs from low-cost tin powder.
  • Fabrication of slurry-processed anodes for half-cell (vs. Li-foil) and full-cell (vs. NMC811) testing.
  • Electrochemical characterization including cycling stability and capacity measurements.
  • Structural analysis using Scanning Transmission Electron Microscopy (STEM), Energy-Dispersive X-ray Spectroscopy (EDX), and Raman spectroscopy.

Main Results:

  • hSG NW anodes achieved a capacity of 1040 mA h g⁻¹ after 150 cycles, a 2.8-fold improvement over graphite anodes (372 mA h g⁻¹).
  • Full-cell tests demonstrated the potential for a 50.7% anode mass reduction compared to graphite anodes.
  • Structural analysis revealed the transformation of hSG NWs into an alloyed SiGe porous mesh network during cycling.

Conclusions:

  • Solution-phase synthesis offers a scalable route for producing hSG NWs for LIB applications.
  • hSG NW anodes exhibit superior electrochemical performance and enable significant mass reduction, making them a promising alternative to graphite.
  • Understanding the structural evolution provides insights into the lithiation/delithiation mechanisms, guiding future material design.