Ga₂Te₃-Based Composite Anodes for High-Performance Sodium-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Metal chalcogenides are promising anode materials for sodium-ion batteries (SIBs) due to high theoretical capacities.
• Gallium(III) telluride (Ga₂Te₃) is explored as a novel SIB anode material.

Purpose of the Study:

• To synthesize and evaluate a novel Ga₂Te₃-based ternary composite (Ga₂Te₃-TiO₂-C) as an SIB anode.
• To investigate the electrochemical performance and sodiation/desodiation mechanism of Ga₂Te₃.
• To optimize the carbon content for enhanced performance.

Main Methods:

• High-energy ball milling for composite synthesis.
• Electrochemical analyses to assess performance (specific capacity, rate capability, cycling stability).
• Investigation of phase transition mechanisms during sodiation/desodiation.

Main Results:

• The Ga₂Te₃-TiO₂-C composite exhibited excellent electrochemical performance.
• An optimal carbon content of 10% (Ga₂Te₃-TiO₂-C(10%)) yielded a specific capacity of 437 mAh·g^-1 after 300 cycles at 100 mA·g^-1.
• The material demonstrated high-rate capability with 96% capacity retention at 10 A·g^-1 relative to 0.1 A·g^-1.

Conclusions:

• The Ga₂Te₃-TiO₂-C(10%) composite is a highly effective anode material for SIBs.
• The TiO₂-C hybrid buffering matrix enhances mechanical integrity and electrical conductivity.
• This work presents a simple synthesis route for advanced SIB anodes.