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Related Experiment Video

Updated: Apr 13, 2026

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

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

Published on: November 10, 2014

Thermal-Induced Reversible Spinel-to-Layered Phase Transition in LiCoO₂ Cathodes.

Guangren Wang¹, Jiawei Huang¹, Jiapeng Song¹

¹School of Physics and Materials Science, Jiangxi Provincial Key Laboratory of Photodetectors, Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China.

|April 11, 2026

Summary

Researchers explored the thermal-induced reverse phase transition in degraded lithium cobalt oxide (LiCoO2) materials. This study reveals a "nucleation-oscillation-aggregation" mechanism for regenerating layered cathodes, crucial for improving lithium-ion battery performance.

Keywords:

In situ characterization Lithium cobalt oxide Phase transition Relithiation Transmission electron microscopy

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Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway

Published on: March 7, 2022

Area of Science:

Materials Science
Electrochemistry
Solid-State Chemistry

Background:

Lithium cobalt oxide (LiCoO2) cathode materials degrade during lithium-ion battery cycling.
An irreversible phase transition from layered phase (LP) to spinel phase (SP) causes performance loss.
Regenerating the SP phase back to LP is critical for battery longevity.

Purpose of the Study:

To investigate the feasibility of thermal-induced relithiation and reverse phase transition in LiCoO2.
To elucidate the mechanism of the spinel-to-layered phase transition.
To provide insights for advanced synthesis and regeneration strategies for layered oxide cathodes.

Main Methods:

Thermal analysis to determine transition temperature.
In situ and ex situ characterization techniques to observe phase transformation.
Microscopy and spectroscopy to study the transition mechanism.

Main Results:

The spinel-to-layered phase transition occurs at a mild temperature (around 300 °C).
The transition follows a "nucleation-oscillation-aggregation" mechanism.
The phase propagation exhibits strong anisotropic characteristics from particle surface to bulk.

Conclusions:

Thermal treatment can effectively induce relithiation and reverse phase transition in degraded LiCoO2.
Understanding the "nucleation-oscillation-aggregation" mechanism is key to controlling the regeneration process.
These findings support the development of strategies for regenerating and synthesizing advanced layered oxide cathodes for improved lithium-ion batteries.