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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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High-Entropy Engineering for Multivalency-Induced Stability in SnSb-Based Anodes.

Wei Ran1, Gao Cheng2, Jiajin Luo2

  • 1School of Materials and Energy, Chongqing Key Lab for Battery Materials and Technologies, Southwest University, Chongqing 400715, P. R. China.

ACS Applied Materials & Interfaces
|February 10, 2025
PubMed
Summary

High-entropy engineering of SnSb-based oxides with Ti and Al (SSBTA-600) enhances lithium-ion battery anodes. This approach improves energy density and cycle life by creating oxygen vacancies, boosting performance in alloy-type anodes.

Keywords:
Cyclic stabilityHigh-rate capabilityLithium-ion batteriesOxygen vacancySnSb-based high-entropy oxides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Alloy-type anodes face challenges with volume expansion, limiting energy density and cycle life in lithium-ion batteries.
  • Developing stable and high-performance anode materials is crucial for advancing energy storage technologies.

Purpose of the Study:

  • To engineer a novel high-entropy SnSb-based oxide (SSBTA-600) using Ti and Al codoping for improved alloy-type anodes.
  • To investigate the role of oxygen vacancies in enhancing electrochemical performance and cyclic stability.

Main Methods:

  • High-entropy engineering of SnSb-based oxides codoped with Ti and Al, calcined at 600 °C.
  • Electrochemical testing of SSBTA-600 as an anode material in lithium-ion batteries.
  • Characterization using electron paramagnetic resonance (EPR) and X-ray absorption spectroscopy (XAS) to confirm oxygen vacancies.

Main Results:

  • SSBTA-600 exhibits high capacity (1012 mAh g⁻¹ at 0.5 A g⁻¹) and excellent capacity retention (99% after 500 cycles).
  • Superior rate capability demonstrated with 297 mAh g⁻¹ at 5 A g⁻¹ and 83.5% retention.
  • A LiFePO₄||SSBTA full cell achieved 134 mAh g⁻¹ after 100 cycles with 89.4% retention.

Conclusions:

  • High-entropy engineering effectively promotes oxygen vacancies, significantly enhancing cyclic stability and high-rate performance in alloy-type anodes.
  • The developed SSBTA-600 material shows great promise for next-generation lithium-ion batteries with improved energy density and longevity.