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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Defects, diffusion and dopants in Li8SnO6.

Navaratnarajah Kuganathan1,2, Andrei L Solovjov3, Ruslan V Vovk4

  • 1Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom.

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|July 19, 2021
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Summary
This summary is machine-generated.

Octalithium tin oxide (Li8SnO6) shows fast lithium-ion conductivity due to favorable Li Frenkel defects. Atomistic simulations reveal promising dopants for enhancing lithium-ion battery performance.

Keywords:
Atomistic simulationDefectsDiffusionDopantsLi8SnO6

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Materials Science

Background:

  • Octalithium tin (IV) oxide (Li8SnO6) is a high-capacity material for lithium-ion batteries (LIBs).
  • Understanding intrinsic defects and ion diffusion is crucial for optimizing its electrochemical performance.

Purpose of the Study:

  • To investigate intrinsic defects, Li-ion diffusion, and dopant effects in Li8SnO6 using atomistic simulations.
  • To identify potential dopants for enhancing Li-ion conductivity and battery capacity.

Main Methods:

  • Atomistic simulations were employed to study defect formation energies and Li-ion migration pathways.
  • Calculations included intrinsic defects, Li-ion diffusion mechanisms, and the impact of various dopants (Na, Ti, Ga).

Main Results:

  • The Li Frenkel defect is the most stable intrinsic defect, promoting Li vacancy-mediated diffusion.
  • A low activation energy (0.21 eV) suggests potentially fast Li-ion conductivity.
  • Isovalent dopants Na (on Li sites) and Ti (on Sn sites) are promising.
  • Ga doping on Sn sites can induce Li interstitials and oxygen vacancies, potentially increasing capacity but risking Li2O loss.

Conclusions:

  • Li8SnO6 exhibits favorable intrinsic defects and low migration energy barriers for fast Li-ion transport.
  • Strategic doping, particularly with Ga, offers pathways to enhance capacity, though material stability needs consideration.