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Updated: Jul 3, 2025
05:33
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Ion Transport in (Localized) High Concentration Electrolytes for Li-Based Batteries.
Helen K Bergstrom1,2, Bryan D McCloskey1,2
1Department of Chemical & Biomolecular Engineering, University of California, Berkeley, California 94720, United States.
ACS Energy Letters
|February 15, 2024
Summary
High concentration electrolytes (HCEs) improve lithium transference numbers (t+) in Li-ion batteries. However, adding diluents to localized HCEs decreases t+, disrupting ion-hopping mechanisms.
Area of Science:
- Electrochemistry
- Materials Science
- Physical Chemistry
Background:
- High concentration electrolytes (HCEs) and localized HCEs (LHCEs) offer potential for higher energy density Li-ion batteries.
- Their unique solvent structures provide advantageous interfacial properties.
Purpose of the Study:
- To characterize full transport properties of electrolytes, including lithium transference numbers (t+).
- To investigate the impact of HCEs and LHCEs on ion transport mechanisms.
Main Methods:
- Electrophoretic Nuclear Magnetic Resonance (ENMR) spectroscopy.
- Electrochemical techniques.
- Calculation of Onsager transport coefficients.
Main Results:
- Lithium transference numbers (t+) increase in HCEs compared to conventional electrolytes.
- Addition of diluents to LHCEs significantly decreases t+.
- Observed ion transport mechanisms include correlated cation-cation motion and cation-anion ligand exchange in HCEs, contrasting with anticorrelated motion in diluted LHCEs.
Conclusions:
- Concerted ion-hopping mechanisms contribute to high t+ in HCEs.
- Diluents disrupt these mechanisms in LHCEs, leading to reduced t+.
- Viscosity alone does not explain the observed transference number variations.
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