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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Design of Gradient Ti Reconstituted Fe2O3 Anodes with Enhanced Lithium Affinity Modulated Electronic Structures:

Huan Liu1, Na Li1, Shiwei Zhang2

  • 1Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, PR China.

ACS Applied Materials & Interfaces
|May 2, 2023
PubMed
Summary

Heteroatomic doping of iron(III) oxide (Fe2O3) with titanium (Ti) enhances its conductivity and stability for lithium-ion battery anodes. This strategy improves energy storage performance, offering a promising alternative to graphite electrodes.

Keywords:
Fe2O3 anodeLi-ion batteryTi concentration gradient-dopedsurface modificationtheoretical calculations

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Transition metal oxides are promising anode materials for lithium-ion batteries.
  • Poor conductivity and volume expansion limit their practical application.
  • Heteroatomic doping can modulate material properties for improved performance.

Purpose of the Study:

  • To investigate the effect of heteroatomic Ti doping on Fe2O3 for lithium-ion battery anodes.
  • To explore Ti concentration gradient modification for enhanced electrode performance.
  • To provide insights into designing advanced anode materials through theoretical and experimental approaches.

Main Methods:

  • Theoretical calculations (density functional theory) to study Ti doping effects on Fe2O3 electronic structure and Li-ion affinity.
  • Experimental synthesis and characterization of Ti concentration gradient-doped Fe2O3.
  • Electrochemical testing of the modified Fe2O3 as a lithium-ion battery anode.

Main Results:

  • Ti doping effectively modulates the electronic structure and surface Li-ion affinity of Fe2O3.
  • Ti concentration gradient modification leads to high-performance anode materials.
  • The doped Fe2O3 exhibits excellent long-cycle stability, achieving 1001.9 mAh g-1 at 1 A g-1 for 1200 cycles.
  • Maintained reversible capacity comparable to graphite electrodes at 2 A g-1 for 2000 cycles.

Conclusions:

  • Heteroatomic Ti doping and concentration gradient strategy are effective for developing high-performance Fe2O3 anode materials.
  • This approach offers a pathway for intelligent design of advanced alkali metal ion batteries.
  • The study combines theoretical predictions with experimental validation for material development.