Enhanced Stability Lithium-Ion Battery Based on Optimized Graphene/Si Nanocomposites by Templated Assembly

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Silicon (Si)-based composites are promising high-performance anodes for lithium-ion batteries due to increasing energy demands.
• Significant volume changes in Si during battery cycling cause stability and safety issues, limiting practical applications.

Purpose of the Study:

• To fabricate an optimized reduced graphene oxide/silicon (RGO/Si) composite with enhanced stability for lithium-ion battery anodes.
• To address the volume expansion challenges of silicon anodes through a novel composite structure.

Main Methods:

• A facile templated self-assembly strategy was employed to create the RGO/Si composite.
• Uniformly dispersed silicon nanoparticles were supported by reduced graphene oxide, forming a 3D network.

Main Results:

• The optimized 10RGO/Si-600 composite exhibited excellent electrochemical performance as a lithium-ion battery anode.
• It demonstrated a high reversible capacity of 2317 mA h/g with 93.2% initial efficiency.
• The composite maintained 85% capacity retention after 100 cycles at 0.1 A/g and 728 mA h/g at 2 A/g.

Conclusions:

• The RGO/Si composite effectively buffers silicon's volume change, enhancing structural integrity and stability.
• The 3D graphene network improves electrical conductivity and forms a stable solid-electrolyte interphase.
• This study presents an optimized method for advanced graphene/Si nanocomposites for high-stability lithium-ion batteries.