A Layer-Structured GeBi₄Te₇ Anode for Na-Ion Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Sodium-ion batteries are crucial for large-scale energy storage and electric vehicles.
• Developing high-capacity, stable anode materials for sodium-ion batteries is a key challenge.

Purpose of the Study:

• To synthesize and characterize a novel layered ternary GeBi4Te7 anode material.
• To evaluate its electrochemical performance for sodium-ion battery applications.

Main Methods:

• Facile high-energy ball milling synthesis.
• Electrochemical testing including capacity, cycling stability, and Coulombic efficiency measurements.
• Investigation of the sodium-ion reaction mechanism.

Main Results:

• GeBi4Te7 exhibits a layered structure with 2D channels for rapid ion transport.
• Achieved a high reversible specific capacity of 449.4 mA h g⁻¹ at 1 A g⁻¹.
• Demonstrated excellent cycling stability with 90.8% capacity retention after 7400 cycles.
• High initial Coulombic efficiency of 96.4% was recorded.

Conclusions:

• Layered ternary GeBi4Te7 is a promising anode material for sodium-ion batteries.
• The material offers high capacity, stable cycling, and efficient sodium storage.
• This work contributes to the exploration of multimetal tellurides for advanced energy storage solutions.