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Molecular Design Strategy for Ordered Mesoporous Stoichiometric Metal Oxide
Changyao Wang1, Xiaoyue Wan2, Linlin Duan1
1Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, iChEM and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China.
Angewandte Chemie (International Ed. in English)
|August 15, 2019
Summary
Researchers developed ordered mesoporous titanium-doped lithium titanate (OM-Ti3+-Li4Ti5O12) using a novel molecular precursor. This material exhibits exceptional rate and cycling performance for energy storage applications.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Ordered mesoporous materials offer high surface area and tunable porosity for advanced applications.
- Lithium titanate (Li4Ti5O12) is a promising anode material for lithium-ion batteries due to its stable structure and zero-strain properties.
- Doping and nanostructuring are key strategies to enhance the electrochemical performance of Li4Ti5O12.
Purpose of the Study:
- To develop a facile and controllable method for synthesizing ordered mesoporous Ti3+-doped Li4Ti5O12 (OM-Ti3+-Li4Ti5O12) nanocrystal frameworks.
- To investigate the impact of Ti3+ doping and ordered mesoporous structure on the electrochemical properties of Li4Ti5O12.
- To establish a molecular design strategy for constructing stoichiometric ordered mesoporous oxides.
Main Methods:
- Utilized a stoichiometric cationic coordination assembly process with a novel Ti4+/Li+-citrate chelate precursor.
- Employed Pluronic F127 as a structure-directing agent for mesostructure formation.
- Characterized the synthesized materials using advanced analytical techniques to confirm structure, composition, and morphology.
Main Results:
- Successfully synthesized ordered mesoporous Ti3+-doped Li4Ti5O12 (OM-Ti3+-Li4Ti5O12) nanocrystal frameworks.
- Achieved excellent rate capability, delivering 143 mAh g-1 at 30 C.
- Demonstrated superior cycling stability with less than 0.005% fading per cycle.
- The molecular precursor strategy enabled homogeneous atomic-scale coordination and controllable co-assembly.
Conclusions:
- The developed molecular design strategy provides a facile route for creating stoichiometric ordered mesoporous oxides with highly crystalline frameworks.
- The OM-Ti3+-Li4Ti5O12 material exhibits outstanding electrochemical performance, highlighting its potential for high-performance energy storage.
- This approach opens new avenues for the rational design and synthesis of advanced mesoporous materials.
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