Dual‐Ion Battery Outperforming Most Known Cells

  • Author: ChemistryViews.org
  • Published: 27 December 2018
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Energy Technology/Wiley-VCH
thumbnail image: Dual‐Ion Battery Outperforming Most Known Cells

Dual‐ion batteries are a promising technology, but their high self‐discharge rate is a problem. Wenhui Yuan, South China University of Technology, Guangzhou, and colleagues have developed a strategy to solve this problem by using FeFe(CN)6 as an anode material for hosting Na+ cations (pictured). The relatively high bonding force between FeFe(CN)6 and Na+ can hinder the cations' self‐extraction from electrodes and decrease the self‐discharge rate.


The team synthesized FeFe(CN)6 nanoparticles using a solution reaction method. Then they measured the Na+ insertion into a FeFe(CN)6 anode using cyclic voltammetry (CV), galvanostatic charge‐discharge, and X-Ray Diffraction (XRD) tests. The results suggest a reversible process.

The researchers then built dual-ion batteries using FeFe(CN)6 as the anode material, natural graphite as the cathode material for hosting bis(trifluoromethanesulfonyl)imide anions (TFSI), and NaTFSI/EMImTFSI as the electrolyte (EMIm = 1-ethyl-3-methylimidazolium). The batteries have a high Coulombic efficiency and cyclability. They also have a low self‐discharge rate with a resting capacity decay of 0.32 % h–1, outperforming most known dual‐ion cells.


 

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