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Related Experiment Video

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Boosting the Cycle Performance of Iron Trifluoride Based Solid State Batteries at Elevated Temperatures by

Huan Hu1, Xuedong Zhang1, Zhenren Gao1

  • 1School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|November 21, 2023
PubMed
Summary

Stabilizing the cathode interface in iron trifluoride (FeF3) batteries with boron doping significantly enhances cycle life. This innovation enables over 1000 cycles for high-energy density lithium-ion batteries.

Keywords:
cathode solid electrolyte interfacedensity functional theorymetal fluoride cathodesolid‐state battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Iron trifluoride (FeF3) offers potential for high-energy density lithium-ion batteries due to its low cost.
  • Rapid performance degradation in FeF3 cathodes at elevated temperatures is caused by unstable cathode solid electrolyte interface (CEI) and material dissolution.

Purpose of the Study:

  • To enhance the cycle performance and stability of FeF3-based cathodes in lithium-ion batteries.
  • To investigate the mechanism of CEI stabilization through salt composition engineering.

Main Methods:

  • Engineering lithium salt composition to incorporate boron (B) into the polymer electrolyte.
  • Utilizing advanced electron microscopy and density functional theory (DFT) calculations.
  • Fabricating and testing FeF3-based composite cathodes at 60 °C.

Main Results:

  • A stable Fe3O4-type CEI, doped with boron (BOR-CEI), was successfully formed at 60 °C.
  • FeF3-based cathodes demonstrated over 1000 cycles with up to 70% utilization of theoretical capacity.
  • Boron doping enhanced CEI elasticity and mechanical robustness, preventing active material dissolution.

Conclusions:

  • Engineering the CEI composition by incorporating boron is a viable strategy to improve the durability and performance of FeF3 cathodes.
  • The stabilized BOR-CEI significantly extends the cycle life of lithium-ion batteries.
  • This approach addresses the critical challenge of active material dissolution in high-energy density battery systems.