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Heterogeneous Interface Design with Oxygen Vacancy-Rich Assistance High-Capacity Titanium-Based Oxide Anode Materials
Dapeng Zuo1, Weijia Meng2, Changchun Fan1
1Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China.
ACS Applied Materials & Interfaces
|September 20, 2024
Summary
Researchers developed FeTiO3/TiO2 heterostructured double-shell microspheres (FTO) to enhance sodium-ion battery (SIB) anodes. FTO improves kinetics and stability, offering a promising solution for high-performance SIBs.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium-ion batteries (SIBs) are attractive due to abundant sodium resources and low cost.
- Titanium dioxide (TiO2) is a safe, long-lifespan anode material for SIBs, but suffers from slow kinetics, poor conductivity, and irreversible sodium-ion (Na+) capture.
- Addressing these limitations is crucial for advancing SIB technology.
Purpose of the Study:
- To synthesize novel FeTiO3/TiO2 heterostructured double-shell microspheres (FTO) as advanced anode materials for SIBs.
- To investigate the structural and electrochemical properties of FTO for improved Na+ storage.
- To overcome the kinetic limitations and irreversible Na+ capture associated with traditional TiO2 anodes.
Main Methods:
- Utilized a combination of the template approach and double-hydrolysis method for FTO synthesis.
- Characterized the FTO material's structure, morphology, and composition.
- Evaluated the electrochemical performance of FTO as an anode in SIBs, including capacity, rate capability, and cycle stability.
Main Results:
- FTO materials exhibit enhanced reaction kinetics and electronic conductivity due to the built-in electric field effect of heterostructures.
- The double-shell structure facilitates electrolyte infiltration, shortens ion/electron diffusion paths, and accommodates volume expansion.
- FTO demonstrated a high capacity of 362.7 mA h g-1 after 60 cycles at 20 mA g-1 and excellent cycle stability with a decay rate of 0.0061% after 1000 cycles at 2 A g-1.
Conclusions:
- Constructing heterogeneous interfaces in TiO2-based materials is an effective strategy for designing high-performance SIB anodes.
- FTO heterostructures successfully inhibit irreversible Na+ capture and unfavorable surface interactions.
- The developed FTO material shows significant potential for practical applications in advanced sodium-ion batteries.
