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TiO2-Coated Silicon Nanoparticle Core-Shell Structure for High-Capacity Lithium-Ion Battery Anode Materials
Jinbao Li1, Sha Fan1, Huijuan Xiu1
1College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
Nanomaterials (Basel, Switzerland)
|April 13, 2023
Summary
Silicon nanoparticles coated with titanium dioxide and doped with silver nanowires offer improved stability and conductivity for lithium-ion batteries. This novel core-shell structure enhances energy density and addresses key limitations in silicon anode materials.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Silicon anodes are promising for high energy density lithium-ion batteries.
- Volume expansion and unstable solid electrolyte interface (SEI) hinder silicon anode practical application.
Purpose of the Study:
- To develop a stable and high-performance silicon-based anode material.
- To overcome the volume expansion and SEI instability issues in silicon anodes.
Main Methods:
- Fabrication of silicon nanoparticles (SiNPs) with a titanium dioxide (TiO2) buffer layer, forming a core-shell structure (SiNPs@TiO2).
- Incorporation of silver nanowires (AgNWs) to create a conductive network.
- Electrochemical performance testing of the SiNPs@TiO2/AgNWs composite as a lithium-ion battery anode.
Main Results:
- The SiNPs@TiO2/AgNWs composite exhibited a high first discharge specific capacity of 3524.2 mAh·g-1 at 400 mA·g-1.
- The core-shell structure effectively accommodated volume changes and improved interfacial stability.
- AgNWs doping enhanced the material's conductivity.
Conclusions:
- The SiNPs@TiO2/AgNWs composite demonstrates excellent electrochemical performance for high-efficiency lithium-ion batteries.
- This core-shell nanostructure provides a viable strategy for developing advanced silicon-based anode materials.
