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Related Experiment Video

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

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Modulating Surface Structural Evolution of LiCoO₂ for Enhanced Extreme Fast-Charging Durability.

Yuhao Du¹, Wenguang Zhao¹, Zijian Li¹

¹School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China.

|July 12, 2025

Summary

This summary is machine-generated.

Fast charging degrades lithium-ion battery cathodes like lithium cobalt oxide (LCO) due to uneven surface changes. A new surface coating improves uniformity, enhancing battery durability for faster charging.

Keywords:

LiCoO2 cycle stability fast charging rock-salt phase structure evolution

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Area of Science:

Materials Science
Electrochemistry
Battery Technology

Background:

Lithium-ion battery cathodes, particularly LiCoO2 (LCO), face structural degradation during fast charging.
The precise mechanisms behind this degradation, especially at high charge rates, are not fully understood.

Purpose of the Study:

To investigate the surface structural evolution of LCO cathodes during extreme fast charging (10 C).
To elucidate the role of surface phase transitions in capacity fading.
To demonstrate a surface coating strategy for improving fast-charging performance.

Main Methods:

In-situ electrochemical cycling of LCO at 4.6 V vs Li/Li+ with a 10 C current rate.
Analysis of surface structural changes using advanced characterization techniques (details not specified in abstract).
Implementation and testing of a novel surface coating on LCO cathodes.

Main Results:

Extreme fast charging causes heterogeneous delithiation on the LCO surface.
This leads to the formation of a triphase hybrid (layered, spinel, rock-salt) that propagates into the bulk.
The rock-salt phase thickens, hindering Li+ transport and accelerating capacity fade.
A robust surface coating mitigates heterogeneous delithiation and rock-salt phase thickening, improving cycling stability.

Conclusions:

Heterogeneous Li+ delithiation and subsequent rock-salt phase formation are key failure mechanisms in LCO cathodes during fast charging.
Surface modification is a viable strategy to enhance the fast-charging durability of LCO batteries.
This research provides insights for developing advanced LCO cathodes for high-power applications.