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High-Ionic-Conductivity Sodium-Based Ionic Gel Polymer Electrolyte for High-Performance and Ultrastable

Thi Huyen Nguyen¹, Dawoon Lee¹, Yongjun Song¹

¹Department of Photonics and Nanoelectronics, Hanyang University, Ansan15588, Republic of Korea.

ACS Applied Materials & Interfaces

|January 9, 2023

Summary

This study developed a cost-effective sodium-based ionic gel polymer electrolyte (IGPE) for high-performance microsupercapacitors. The new IGPE demonstrates excellent ionic conductivity and electrochemical stability, paving the way for advanced solid-state energy storage solutions.

Keywords:

cross-linking reaction high ionic conductivity long cycle life microsupercapacitor sodium ionic gel polymer electrolyte

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Sodium-based ionic gel polymer electrolytes (IGPEs) offer a cost-effective alternative to lithium-based systems for energy storage.
Existing sodium-based IGPEs exhibit limitations in ionic conductivity and electrochemical stability compared to their lithium counterparts, hindering their use in high-performance microsupercapacitors (MSCs).

Purpose of the Study:

To develop a high-performance sodium-based IGPE with enhanced ionic conductivity and electrochemical stability.
To fabricate and evaluate MSCs utilizing the novel sodium-based IGPE for potential applications in portable and stationary energy solutions.

Main Methods:

Synthesized a sodium-based IGPE using poly(ethylene glycol) diacrylate (PEGDA) as a polymer matrix, sodium perchlorate (NaClO4) as the salt, and tetramethylene glycol ether (G4) with 1-ethyl-3-methylimidazolium bis(triflouromethylsulfonyl)imide (EMIM-TFSI) as ionic liquid components.
Fabricated a microsupercapacitor (MSC) with an interdigital reduced graphene oxide electrode and the synthesized IGPE.
Characterized the electrochemical performance of the MSC, including ionic conductivity, power density, energy density, and cycling stability.

Main Results:

The developed sodium-based IGPE achieved an ionic conductivity of up to 0.54 mS/cm at room temperature.
The fabricated MSC exhibited a high power density of ~2500 W/kg and a maximum energy density of ~0.7 Wh/kg.
The MSC demonstrated excellent cycling stability, retaining approximately 98.9% of its capacitance after 20,000 cycles within a 0.0 to 1.0 V potential window.

Conclusions:

The novel sodium-based IGPE is a promising material for high-performance and stable microsupercapacitors.
The developed IGPE-based MSCs show potential as solid-state energy sources for various applications.
The cost-effectiveness and performance of these sodium-based MSCs make them a viable alternative to lithium-based energy storage devices.