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Manipulating electrolyte solvation structures to build high-voltage concentration batteries for efficient energy
Wentao Hou1, Zhilong Wang2,3,4, Songyang Chang1
1Department of Chemistry, University of Puerto Rico-Rio Piedras Campus, San Juan, PR, USA.
Nature Communications
|June 5, 2026
Summary
Concentration batteries achieve higher voltages by tailoring electrolyte properties. This breakthrough enables metal-based batteries with significantly improved voltage and energy density.
Area of Science:
- Electrochemistry
- Materials Science
Background:
- Concentration batteries are Galvanic cells utilizing identical redox couples but differing electrolyte compositions for voltage generation.
- Limited voltage output (<0.059 V) from typical concentration differences has restricted their practical applications.
Purpose of the Study:
- To overcome the voltage limitations of concentration batteries.
- To develop higher voltage metal-based concentration batteries (zinc and copper).
Main Methods:
- Asymmetric electrolyte design by employing a highly concentrated catholyte and a strongly complexing anolyte.
- Tuning redox potentials at both electrodes through electrolyte engineering.
Main Results:
- Achieved cell voltages of 0.6-0.7 V, surpassing the conventional 0.059 V limit.
- Demonstrated potential for higher voltage aqueous full cells (2.2-2.5 V) when combined with common positive electrodes.
Conclusions:
- Electrolyte property tailoring is a viable strategy to significantly enhance concentration battery voltages.
- This approach boosts energy density and broadens the applicability of metal-based concentration batteries.
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