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$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$

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Topotactically transformable antiphase boundaries with enhanced ionic conductivity.

Kun Xu^1,2, Shih-Wei Hung^3,4, Wenlong Si^5,6

¹National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, PR China. kunxuem@stanford.edu.

Nature Communications

|November 15, 2023

Summary

This summary is machine-generated.

Engineering lattice defects, specifically topotactically transformable antiphase boundaries (tt-APBs), enhance ionic conductivity in mixed ionic-electronic conductors (MIECs). These tt-APBs act as crucial anion diffusion channels, improving performance in solid oxide fuel cells.

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Area of Science:

Materials Science
Solid-State Chemistry
Nanotechnology

Background:

Lattice defects are engineered to tune device functionality.
Antiphase boundaries (APBs) in mixed ionic-electronic conductors (MIECs) have traditionally hindered ionic conductivity for solid oxide fuel cells.
Understanding defect behavior is key to optimizing energy devices.

Purpose of the Study:

To identify and characterize topotactically transformable antiphase boundaries (tt-APBs) at the atomic level.
To investigate the ionic conductivity of these tt-APBs compared to perfect domains.
To elucidate the mechanism of oxygen migration across tt-APBs.

Main Methods:

Atomic-level defect identification using advanced microscopy.
In-situ observation of dynamic oxygen migration.
Annealing experiments in controlled atmospheres.

Main Results:

Topotactically transformable APBs (tt-APBs) exhibit higher ionic conductivity than defect-free domains at elevated temperatures.
Dynamic oxygen migration was observed across tt-APBs, facilitated by interstitial sites.
Annealing in oxidizing conditions promotes interstitial oxygen formation at tt-APBs, enhancing conductivity.

Conclusions:

tt-APBs function as effective anion diffusion channels, significantly contributing to oxygen conductivity.
Topotactic transformability is a critical factor determining the role of APBs in ionic transport.
Defect engineering via tt-APBs offers a promising strategy for enhancing ionic transport in MIECs for energy applications.