Concentration-Gradient Prussian Blue Cathodes for Na-Ion Batteries

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

doi:10.1021/acsenergylett.9b02410

Concentration-Gradient Prussian Blue Cathodes for Na-Ion Batteries

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

Civil and Architectural Engineering and Mechanics

Research output: Contribution to journal › Article › peer-review

104 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 Na_xNi_yMn_1-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 Na_xMnFe(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 language	English (US)
Pages (from-to)	100-108
Number of pages	9
Journal	ACS Energy Letters
Volume	5
Issue number	1
DOIs	https://doi.org/10.1021/acsenergylett.9b02410
State	Published - 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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title = "Concentration-Gradient Prussian Blue Cathodes for Na-Ion Batteries",

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.",

author = "Pu Hu and Wenbo Peng and Bo Wang and Dongdong Xiao and Utkarsh Ahuja and Julien R{\'e}thor{\'e} and Aifantis, {Katerina E.}",

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AU - Hu, Pu

AU - Peng, Wenbo

AU - Wang, Bo

AU - Xiao, Dongdong

AU - Ahuja, Utkarsh

AU - Réthoré, Julien

AU - Aifantis, Katerina E.

PY - 2020/1/10

Y1 - 2020/1/10

N2 - 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.

AB - 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.

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Concentration-Gradient Prussian Blue Cathodes for Na-Ion Batteries

Abstract

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