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Updated: May 21, 2025
11:04
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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Macromolecule-Enriched Solvation Enabling High-Voltage Sodium-Ion Batteries.
Zhiming Zhao1, Chen Liu1, Tianxing Lai1
1Materials Science and Engineering Program and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, 78712, USA.
Angewandte Chemie (International Ed. in English)
|March 20, 2025
Summary
This study introduces a novel macromolecule-enriched electrolyte for high-voltage sodium-ion batteries (SIBs). This breakthrough enables stable operation at 4.4 V, overcoming limitations of current SIB electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium-ion batteries (SIBs) offer a sustainable energy storage solution but are limited by low voltage (< 4 V) due to electrolyte instability.
- Developing high-voltage electrolytes is crucial for enhancing SIB energy density.
Purpose of the Study:
- To design and characterize a novel high-voltage sodium-ion battery electrolyte.
- To improve the electrochemical stability and energy density of SIBs.
Main Methods:
- Developed a macromolecule-enriched electrolyte (MEE) using macro polyamide (PA) to replace small solvent molecules in the Na+ solvation shell.
- Investigated the electrolyte's electrochemical stability window and ion transport properties.
- Fabricated and tested hard carbon (HC) || NaNi1/3Fe1/3Mn1/3O2 (NFM) full cells.
Main Results:
- The MEE exhibited enhanced thermodynamic resilience and suppressed oxidative/reductive decomposition, achieving a wide electrochemical stability window.
- Anion stabilization via H-bonding with PA and a high Na+ transference number (0.93) were observed.
- Nitrogen-rich MEE promoted robust nitride interphases, ensuring cathode and anode stability.
- HC||NFM full cells demonstrated excellent rechargeability at an ultrahigh cutoff voltage of 4.4 V.
Conclusions:
- The macromolecule-enriched electrolyte represents a significant advancement for high-voltage SIBs.
- This approach offers a novel, non-fluorinated principle for designing stable, high-performance electrolytes, potentially revolutionizing SIB technology.
Keywords:
Hard carbon anodeHigh‐voltage electrolyteLayered oxide cathodeSodium‐ion batteriesSolvation structureMore Related Videos
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