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Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...

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Pre-engineering artificial solid electrolyte interphase for hard carbon anodes for superior sodium storage

Lu Shi1, Yadi Sun1, Wei Liu1

  • 1Institute of Intelligent Flexible Mechatronics & School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, China.

Chemical Communications (Cambridge, England)
|October 6, 2023
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Summary
This summary is machine-generated.

Researchers engineered a 5-nm artificial solid electrolyte interface (SEI) for hard carbon anodes in sodium-ion batteries. This innovation significantly boosts initial Coulombic efficiency and enhances long-term cycling stability and rate performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries due to the abundance of sodium.
  • Hard carbon anodes are widely used in SIBs but suffer from low initial Coulombic efficiency and capacity degradation.
  • The formation of a stable solid electrolyte interface (SEI) is crucial for anode performance.

Purpose of the Study:

  • To engineer a stable artificial solid electrolyte interface (SEI) for hard carbon anodes in sodium-ion batteries.
  • To evaluate the impact of the artificial SEI on the electrochemical performance of hard carbon anodes.
  • To improve the initial Coulombic efficiency and cycling stability of sodium-ion batteries.

Main Methods:

  • Fabrication of a 5-nm-thick artificial SEI layer on hard carbon anodes.
  • Electrochemical characterization using galvanostatic cycling, cyclic voltammetry, and electrochemical impedance spectroscopy.
  • Performance evaluation under various C-rates and cycle numbers.

Main Results:

  • The artificial SEI significantly improved the initial Coulombic efficiency to 94%.
  • The modified hard carbon anode demonstrated superior rate performance, retaining 247 mA h g-1 at 1C after 800 cycles.
  • Excellent cycling stability was observed, with a reversible capacity of 220 mA h g-1 at 6C after 400 cycles.

Conclusions:

  • The engineered artificial SEI effectively stabilizes the hard carbon anode surface.
  • The artificial SEI is a viable strategy to enhance the performance of sodium-ion batteries.
  • This approach offers a pathway towards practical and high-performance sodium-ion energy storage systems.