Ultra-thin graphene cube framework@TiO₂ heterojunction as high-performance anode materials for lithium ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Titanium dioxide (TiO2) is a promising anode material for lithium-ion batteries.
• However, its poor electrical conductivity and slow ion transport limit its performance.
• Graphene is known for its excellent electrical conductivity and large surface area.

Purpose of the Study:

• To develop an integrated graphene cube (Gr) framework@TiO2 composite anode.
• To improve the ion transport kinetics and electrical conductivity of TiO2.
• To achieve a long-life, high-capacity anode for lithium-ion batteries.

Main Methods:

• Fabrication of Gr@TiO2 composite using a salt template method for an ultra-thin framework.
• Electrochemical performance testing, including initial coulombic efficiency, rate performance, and specific capacity.
• Kinetic studies using Electrochemical Impedance Spectra (EIS), Galvanostatic Intermittent Titration Technique (GITT), and Linear Sweep Voltammetry (LSV).

Main Results:

• The Gr@TiO2 composite exhibits enhanced electrochemical performance.
• Achieved a high stable reversible capacity of 179.5 mAh g⁻¹ after 4000 cycles at 1 A g⁻¹.
• Demonstrated excellent rate performance with 125.5 mAh g⁻¹ at 5 A g⁻¹.
• The ultra-thin graphene cube framework improved electrical conductivity and ion transport kinetics, acting as a heterojunction structure.

Conclusions:

• The Gr@TiO2 composite effectively restrains anode pulverization and agglomeration during long-term cycling.
• The integrated graphene cube framework significantly enhances TiO2 anode performance for lithium-ion batteries.
• This strategy offers a promising pathway for developing advanced energy storage materials.