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Towards an all-copper redox flow battery based on a copper-containing ionic liquid.

Stijn Schaltin1, Yun Li, Neil R Brooks

  • 1KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, Box 2450, 3001 Leuven, Belgium. jan.fransaer@mtm.kuleuven.be.

Chemical Communications (Cambridge, England)
|November 4, 2015
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Summary

Researchers developed the first redox flow battery (RFB) using a novel liquid metal salt (LMS) electrolyte. This copper-based LMS offers high energy density and stability, demonstrating LMS potential for advanced battery applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Redox flow batteries (RFBs) are crucial for grid-scale energy storage.
  • Conventional aqueous electrolytes have limitations in electrochemical window and thermal stability.
  • Novel electrolyte systems are needed to enhance RFB performance.

Purpose of the Study:

  • To introduce the first redox flow battery (RFB) utilizing a novel liquid metal salt (LMS) electrolyte.
  • To evaluate the performance of a copper-based LMS, [Cu(MeCN)4][Tf2N], as a non-aqueous electrolyte for RFBs.
  • To demonstrate the feasibility of LMS as a functional electrolyte in RFB systems.

Main Methods:

  • Synthesis and characterization of the all-copper liquid metal salt, [Cu(MeCN)4][Tf2N].
  • Assembly and testing of a proof-of-concept redox flow battery using the LMS electrolyte.
  • Electrochemical performance evaluation, including charge/energy density and Coulombic efficiency.

Main Results:

  • The [Cu(MeCN)4][Tf2N] LMS functions as both solvent and electrolyte.
  • The non-aqueous system exhibits a large electrochemical window and high thermal stability.
  • Achieved high charge density (300 kC l⁻¹) and energy density (75 W h l⁻¹) due to high copper concentration.
  • Demonstrated a Coulombic efficiency of up to 85%.

Conclusions:

  • Liquid metal salts (LMS) are viable electrolytes for redox flow batteries.
  • The copper-based LMS offers significant advantages in charge and energy density over traditional electrolytes.
  • This work presents a promising new direction for developing high-performance, non-aqueous RFBs.