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Lithium metal deposition/dissolution under uniaxial pressure with high-rigidity layered polyethylene separator
Shogo Kanamori1, Mitsuhiro Matsumoto1, Sou Taminato1
1Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan taminato@chem.mie-u.ac.jp +81-59-231-9478 +81-59-231-9968.
RSC Advances
|May 6, 2022
Summary
Applying mechanical pressure during lithium metal deposition prevents dendrite formation, yielding denser lithium and improving coulombic efficiency. Optimal pressure and stiffer separators enhance cycle life for lithium metal anodes.
Area of Science:
- Electrochemistry
- Materials Science
Background:
- Lithium metal anodes are crucial for high-energy-density batteries.
- Dendrite formation during lithium deposition leads to short circuits and safety hazards.
Purpose of the Study:
- To investigate the impact of mechanical uniaxial pressure and separator properties on lithium metal deposition.
- To optimize conditions for improved lithium plating/stripping and cycle life.
Main Methods:
- Electrochemical deposition of lithium metal under varying mechanical pressures.
- Analysis of lithium morphology using microscopy.
- Evaluation of coulombic efficiency and cycle life.
Main Results:
- Mechanical pressure suppresses dendritic lithium growth, promoting dense and compact deposition.
- Coulombic efficiency increased by 10% under pressure.
- Optimal pressure identified around 1.39 MPa; higher pressures reduced cycle life.
- Increased separator stiffness (using multiple polyethylene layers) further improved lithium morphology and cycling.
Conclusions:
- Mechanical pressure is an effective strategy to control lithium metal morphology and enhance electrochemical performance.
- Optimizing pressure and separator stiffness can significantly improve the cycle life and safety of lithium metal anodes.
