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Researchers developed a novel solvent-locked carbonate electrolyte for sodium-ion batteries. This innovation enhances stability at high voltages, enabling longer lifespans and improved energy density for sustainable energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium-ion batteries offer a sustainable alternative to lithium-ion batteries due to resource availability and safety.
  • Increasing operating voltage is key to enhancing sodium-ion battery energy density.
  • Electrolyte instability at high voltages leads to electrode degradation and capacity fade.

Purpose of the Study:

  • To design a stable electrolyte for high-voltage sodium-ion batteries.
  • To improve electrode stability and cycle life.
  • To enable higher energy density in sodium-ion battery systems.

Main Methods:

  • Development of a solvent-locked carbonate electrolyte.
  • Investigation of electrolyte-electrode interfacial chemistry.
  • Electrochemical testing of sodium-ion cells with commercial cathode materials.

Main Results:

  • The novel electrolyte forms a stable, anion-rich interphase on the positive electrode.
  • Electrolyte decomposition and parasitic reactions are suppressed.
  • Na||Na2.26Fe1.87(SO4)3 cells demonstrate exceptional cycle life up to 4.5 V, retaining over 88% capacity after 16,500 cycles.

Conclusions:

  • The solvent-locked electrolyte enables stable high-voltage operation of sodium-ion batteries.
  • The designed interphase effectively protects the electrode surface.
  • This approach paves the way for durable, high-energy sodium-ion batteries.