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Updated: Jun 25, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Long-life potassium metal batteries enabled by anion-derived solid electrolyte interphase using concentrated ionic

Jiyun Jeon¹, Seokbum Kang¹, Bonhyeop Koo¹

¹Energy Science and Engineering, DGIST, Daegu 42988, Republic of Korea.

Journal of Colloid and Interface Science

|May 23, 2024

Summary

This study introduces a potassium salt-concentrated ionic liquid electrolyte (PCIL) for safer, long-lasting potassium metal batteries (PMBs). The PCIL electrolyte effectively suppresses dendrite growth, enhancing battery performance and safety.

Keywords:

Interfacial kinetics Ionic liquid electrolytes KVPO(4)F Potassium metal batteries Solid electrolyte interphase

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Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Potassium metal batteries (PMBs) are promising next-generation energy storage systems.
Challenges include potassium anode dendritic growth, impacting cycle life and safety.

Purpose of the Study:

To develop a potassium salt-concentrated ionic liquid electrolyte (PCIL) for stable and safe PMBs.
To investigate the electrolyte's properties and performance in K||KVPO4F cells.

Main Methods:

Formulation of a PCIL using KFSI and Pyr13FSI.
Electrochemical characterization including oxidation stability and ionic conductivity measurements.
Cycling performance evaluation of PMBs at different temperatures.

Main Results:

PCIL exhibits high oxidation stability (≈5.2 V), good ionic conductivity (4.0 mS cm⁻¹), and low flammability.
Anion-derived solid-electrolyte interphase (SEI) formation effectively inhibits potassium dendrites.
PMBs with PCIL show superior cycling performance (74.8% retention at 25°C, 82.9% at 45°C after 300 cycles) compared to conventional electrolytes.

Conclusions:

PCIL is a viable electrolyte for realizing practical, long-life, and safe potassium metal batteries.
The developed electrolyte promotes stable cycling through effective dendrite suppression and favorable interfacial kinetics.