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Related Experiment Video

Updated: Aug 7, 2025

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

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Reversible Li⁺ Storage in CF-Based Cathodes through Transition Metal Decomposition.

Nan Sun¹, Yali Zhang¹, Shiguan Xu¹

¹Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province, Key Laboratory of Functional Materials and Photoelectrochemistry of Haikou, College of Chemistry and Chemical Engineering, Hainan Normal University, 99 South Longkun Road, Haikou 571158, China.

Langmuir : the ACS Journal of Surfaces and Colloids

|March 13, 2023

Summary

This summary is machine-generated.

Rechargeable graphite fluoride (CF) cathodes were developed by adding transition metals. This innovation enables reversible lithium-ion storage, overcoming CF

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Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Graphite fluorides (CF) are used in primary lithium batteries due to high capacity and low self-discharge.
The primary discharge of CF with Li+ is largely irreversible, limiting its use in rechargeable batteries.

Purpose of the Study:

To develop rechargeable CF-based cathodes by incorporating transition metals.
To improve the reversibility of the electrode reaction for enhanced lithium-ion storage.

Main Methods:

Fabrication of CF-based cathodes with transition metals (e.g., copper).
Electrochemical testing to evaluate primary and reversible capacities.
Ex situ X-ray diffraction to confirm the formation of metal fluorides (MF).

Main Results:

CF-Cu electrodes demonstrated a high primary capacity (898 mAh g-1) and a reversible capacity (383 mAh g-1 in the second cycle).
Transition metals facilitate the re-conversion of LiF into MF during the charge process, enabling subsequent Li+ storage.
Excessive transition metal decomposition negatively impacts electrode stability.

Conclusions:

Introducing transition metals into CF cathodes enables rechargeable lithium-ion storage.
Controlling transition metal oxidation through methods like building a compact counter electrolyte interface (CEI) is crucial for cathode reversibility and structural stability.