Crumpled two-dimensional heterostructures for pseudocapacitive and interphase-stable fast-charging silicon anodes

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• High-capacity silicon (Si) anodes are crucial for next-generation lithium-ion batteries.
• Si anodes suffer from volume expansion and pulverization during cycling, leading to poor stability.
• Developing robust conductive matrices is essential to overcome these limitations.

Purpose of the Study:

• To develop a crumpled heterostructured composite for stabilizing high-capacity Si anodes.
• To investigate the synergistic effects of reduced graphene oxide (rGO), MoS2, and MXene in the composite.
• To enhance the electrochemical performance and cycling stability of Si anodes.

Main Methods:

• Fabrication of a crumpled heterostructured composite: Si nanoparticles (NPs) with reduced graphene oxide (rGO), MoS2, and Ti3C2Tx MXene (SGMM-CC).
• Characterization of the composite's structure and electrochemical properties.
• Testing the performance of the SGMM-CC anode in lithium-ion batteries.

Main Results:

• The SGMM-CC anode demonstrated a high reversible capacity of ~1350 mAh g⁻¹ at 6 A g⁻¹.
• It achieved an initial Coulombic efficiency of ~84%.
• The anode retained 74.6% of its capacity after 1100 cycles at 3 A g⁻¹, significantly outperforming control electrodes.

Conclusions:

• The multi-2D crumpled heterostructures effectively enable durable and high-rate Si anodes.
• The synergistic integration of rGO, MoS2, and MXene provides a robust conductive matrix.
• This approach offers a promising strategy for advancing next-generation lithium-ion battery technology.