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

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Phase-Changing in Graphite Assisted by Interface Charge Injection.

Fei Pan¹, Kun Ni¹, Yue Ma²

¹Hefei National Research Center for Physical Sciences at the Microscale, & CAS Key Laboratory of Materials for Energy Conversion & Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jin Zhai Road, Hefei, Anhui 230026, P. R. China.

|June 24, 2021

Summary

This summary is machine-generated.

Researchers have discovered a new method to transition graphite phases at lower temperatures. This discovery could enable advanced electronic applications by controlling graphite

Keywords:

graphite hexagonal phase interface charge injection phase transition rhombohedral phase

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Area of Science:

Materials Science
Condensed Matter Physics
Solid-State Chemistry

Background:

Graphite exists in multiple phases, notably rhombohedral (3R) and hexagonal (2H), with distinct electronic properties.
Conventional methods to transition between graphite phases require extremely high temperatures (>1000 °C), limiting practical applications.

Purpose of the Study:

To investigate a novel, lower-temperature method for promoting the 3R to 2H phase transition in graphite.
To explore the influence of charge state manipulation on graphite phase transitions.
To assess the feasibility of using charge transfer for phase transition control in advanced materials.

Main Methods:

Investigated the effect of altering the charged state of three-dimensional (3D) graphite.
Utilized charge transfer from lithium nitride (α-Li3N) to graphite to induce phase transition.
Proposed and analyzed an interlayer slipping model to explain the observed phase transition mechanism.

Main Results:

Demonstrated that modifying the charged state of graphite significantly reduces the energy barrier for phase transition.
Achieved a 3R to 2H graphite phase transition at a substantially lower temperature of 350 °C via charge transfer.
The charge transfer from α-Li3N to graphite was confirmed as an effective method for lowering the transition temperature.

Conclusions:

The charged state of graphite is a critical factor in controlling its phase transitions.
Lowering the transition temperature to 350 °C opens new avenues for technological applications of graphite phase control.
The proposed interlayer slipping model provides a framework for understanding and controlling topological states at phase interfaces.