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Updated: Jun 24, 2025
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Dual-Salts Localized High-Concentration Electrolyte for Li- and Mn-Rich High-Voltage Cathodes in Lithium Metal
Tianyang Wang1, Ruichen Wan2, Zhenghuan Tang1
1Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH, 43212, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|June 14, 2024
Summary
A new dual-salt electrolyte enhances lithium-metal battery performance by stabilizing high-voltage cathodes. This localized high-concentration electrolyte (LHCE) improves capacity retention and battery lifespan, enabling safer, high-energy devices.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Conventional carbonate electrolytes limit the electrochemical stability of high-voltage cathodes in lithium-metal batteries (LMBs).
- Lithium- and manganese-rich (LMR) cathodes require electrolytes with enhanced stability for high-voltage operation (>4.6 V vs. Li).
Purpose of the Study:
- To develop a novel electrolyte for stable high-voltage operation of LMR cathodes in LMBs.
- To investigate the stabilizing mechanisms of a dual-salt localized high-concentration electrolyte (D-LHCE).
Main Methods:
- Utilized 7Li nuclear magnetic resonance and Raman spectroscopy to analyze solvation structures.
- Employed electrochemical impedance spectroscopy and distribution of relaxation times to study interphase stability.
- Tested LMR/Li cells with D-LHCE against conventional electrolytes.
Main Results:
- D-LHCE demonstrated superior stability with 72.5% capacity retention after 300 cycles, compared to 21.9% for conventional electrolytes after 100 cycles.
- LiPF6 ensured stable aluminum current collector passivation.
- LiTFSI formed robust cathode-electrolyte interphase (CEI) and solid-electrolyte interphase (SEI) layers.
Conclusions:
- The D-LHCE concept is an effective strategy for next-generation electrolytes in high-energy and high-voltage LMBs.
- Enhanced CEI and SEI stability are crucial for improving LMB performance and longevity.
Keywords:
Li‐ and Mn‐rich high‐voltage cathodesdual saltselectrode‐electrolyte interphaseshigh voltage Li‐metal batterieslocalized high‐concentration electrolyte (LHCE)More Related Videos
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