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Published on: November 11, 2013
Study on an Interpenetrating Artificial SEI for Lithium Metal Anode Modification and Fast Charging Characterization
Ao Li1, Wenxing Xin1, Qian Wang1
1National Local Joint Engineering Research Center for Lithium-Ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Batteries Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
This study optimizes the solid electrolyte interphase (SEI) for lithium metal anodes by controlling oxygen-sulfur components. The novel SEI structure enhances battery performance and stability, enabling faster charging and longer cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Artificial solid electrolyte interphase (SEI) is crucial for improving lithium metal anodes by mitigating dendrite growth and side reactions.
- The precise role of SEI components and their distribution in modifying lithium metal anodes remains incompletely understood.
Purpose of the Study:
- To investigate the impact of oxygen-sulfur (O-S) component modulation and distribution within the SEI on lithium metal anode performance.
- To elucidate the mechanism by which specific SEI compositions enhance electrochemical properties.
Main Methods:
- Designed experiments to modulate O-S components and their distribution in the SEI.
- Analyzed lithium sulfide (Li₂S) and lithium oxide (Li₂O) properties within an ether electrolyte environment.
- Utilized X-ray photoelectron spectroscopy (XPS) for detailed analysis of SEI structure and component ratios.
Main Results:
- The optimal SEI modulation condition, O120-S10, significantly improved electrochemical reaction kinetics and reduced film resistance.
- Achieved exceptional cycling stability of up to 2100 hours for lithium deposition/stripping at 5 mAh cm⁻².
- Demonstrated excellent performance with a ternary cathode (NCM811) under high charge/discharge rates (10C), maintaining 90 mAh g⁻¹ capacity and 98.52% Coulombic efficiency after 1500 cycles.
Conclusions:
- The O120-S10 SEI, with optimal component ratios (Li₂S 46.48%, Li₂O 46.02%, Li₂CO₃ 7.50%), exhibits a synergistic effect for enhanced lithium metal anode performance.
- The SEI's mechanism involves combining Li₂O's low lithium ion diffusion barrier with Li₂S's dendrite growth inhibition.
- This approach enables fast charging capabilities and superior cycling stability for high-energy lithium metal batteries.
