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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Sustainable High-Performance Aqueous Batteries Enabled by Optimizing Electrolyte Composition.

Raphael L Streng1, Samuel Reiser1, Anatoliy Senyshyn2

  • 1Physics of Energy Conversion and Storage, Department of Physics, Technische Universität München (TUM), James-Franck-Str. 1, 85748, Garching, Germany.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 5, 2025
PubMed
Summary

Lithium-free aqueous batteries offer sustainable energy storage. This study introduces a novel, cost-effective electrolyte enabling high performance and stability for large-scale applications.

Keywords:
aqueous batterieselectrolytesfast chargingmagnesiumpotassium

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Lithium-ion batteries face material scarcity and safety concerns.
  • Lithium-free aqueous batteries (LFABs) are a sustainable alternative but suffer from low energy density and cycle life.
  • Current high-concentration electrolytes are expensive and potentially hazardous.

Purpose of the Study:

  • To develop a cost-efficient electrolyte for LFABs using safe salts at lower concentrations.
  • To optimize the electrolyte for improved cell voltage and cycling stability.
  • To explore the impact of different cation species on battery performance.

Main Methods:

  • Systematic exploration of cation species influence on copper hexacyanoferrate cathode and polyimide anode.
  • Development of a novel electrolyte formulation with inexpensive and safe salts.
  • Electrochemical characterization of the developed LFABs.

Main Results:

  • Achieved a competitive energy density of 48 Wh kg⁻¹ and 95% efficiency.
  • Demonstrated 70% capacity retention at high charge/discharge rates (50 C).
  • Exhibited a maximum specific power exceeding 10000 W kg⁻¹.

Conclusions:

  • The novel electrolyte design significantly enhances the practical application of low-cost LFABs.
  • The developed battery shows strong potential for large-scale energy storage and supercapacitor applications.
  • This work advances sustainable energy storage solutions by utilizing inexpensive and safe materials.