Concentration-Gradient Prussian Blue Cathodes for Na-Ion Batteries

Pu Hu, Wenbo Peng, Bo Wang, Dongdong Xiao, Utkarsh Ahuja, Julien Réthoré, Katerina E. Aifantis

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A concentration-gradient composition is proposed as an effective approach to solve the mechanical degradation and improve the electrochemical cyclability for cathodes of sodium-ion batteries. Concentration-gradient NaxNiyMn1-yFe(CN)6·nH2O particles, in which the Ni content gradually increased from the interior to the particle surface, were synthesized by a facile co-precipitation process. Using these particles as the active material in cathodes resulted in an improved electrochemical performance compared to homogeneous NaxMnFe(CN)6·nH2O, delivering a high reversible specific capacity of 110 mAh g-1 at 0.2 C and outstanding cycling stability (93% retention after 1000 cycles at 5 C). Electron microscopy illustrated that the promising electrochemical properties obtained for the gradient composition can be attributed to its robust microstructure, which alleviated the electrochemically induced stresses and accumulated damage during sodiation/desodiation, preventing hence the fracture which was observed in the homogeneous samples.. These findings render a prospective strategy to develop high-performance electrode materials for sodium-ion batteries.

Original languageEnglish (US)
Pages (from-to)100-108
Number of pages9
JournalACS Energy Letters
Volume5
Issue number1
DOIs
StatePublished - Jan 10 2020

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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