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Interphase Engineering Enhanced Electro-chemical Stability of Prelithiated Anode
Shiwei Xu1,2, Qiu Fang1,3, Jipeng Wu1,3
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100049, China.
Small (Weinheim an Der Bergstrasse, Germany)
|September 2, 2023
Summary
Prelithiation in lithium-ion batteries is improved by a new artificial solid electrolyte interphase (SEI) coating. This protective layer enhances stability and performance, overcoming challenges in practical battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Prelithiation is crucial for lithium-ion batteries to counter initial lithium loss and SEI formation.
- Prelithiated electrodes are highly reactive, leading to side reactions and contamination, hindering practical use.
Purpose of the Study:
- To develop a method for protecting prelithiated electrodes against air and electrolyte reactivity.
- To engineer an artificial solid electrolyte interphase (SEI) via solution treatment.
Main Methods:
- Chemical prelithiation followed by a protective solution treatment.
- Characterization of artificial SEI composition and nanostructure using cryogenic electron microscopy and X-ray photoelectron spectroscopy.
- Electrochemical evaluation of treated graphite electrodes.
Main Results:
- A fluorinated artificial SEI was successfully formed, enhancing interfacial ion transport and air tolerance.
- The treated graphite electrode achieved an initial Coulombic efficiency of 129.4% and retained high capacity.
- Negligible capacity decay was observed over 200 cycles, demonstrating excellent long-term stability.
Conclusions:
- A facile, universal, and controllable method for constructing artificial SEIs on prelithiated electrodes was established.
- The artificial SEI significantly improves lithium-ion battery performance and stability.
- Findings offer insights for upgrading battery fabrication and utilizing advanced electrolytes.
