Issue 44, 2022

High-rate electrochemical lithium-ion storage through Li+ intercalation pseudocapacitance in the Pr1/3NbO3 anode

Abstract

Pseudocapacitance is commonly associated with surface or near-surface redox reaction inside electrode materials, which holds the key to improving the rate capability. However, challenges arise due to the unsatisfactory Li+/electron transport and microstructure of most electrode materials. Here, we exploit conductive Pr1/3NbO3 with ultra-high Li+ intercalation pseudocapacitance, which is a promising alternative for fast-charging LIBs. The micro-sized Pr1/3NbO3 presents a large capacity of 161.9 mA h g−1 at a high current rate of 10C, which is higher than those of most reported fast-charging electrode materials, indicating its excellent rate capability (10C vs. 0.1C capacity ratio of 73.1%). The excellent rate capability can be attributed to the ultra-high Li+ intercalation pseudocapacitance of Pr1/3NbO3, which originates from the fast electron/ion transport and the open three-dimensional ion transport network. Additionally, Pr1/3NbO3 exhibits superior cycling stability with a high capacity retention of 99.7%/97.4% after 250/3000 cycles at 1C/10C. The exceptional cycling stability of Pr1/3NbO3 is likely to be a result of a typical low-strain characteristic, where the volume variation of the unit cell was determined to be only 2.21% during electrochemical cycling. Therefore, Pr1/3NbO3 holds great promise for fast- and stable-charging applications in LIBs.

Graphical abstract: High-rate electrochemical lithium-ion storage through Li+ intercalation pseudocapacitance in the Pr1/3NbO3 anode

Supplementary files

Article information

Article type
Paper
Submitted
09 May 2022
Accepted
04 Oct 2022
First published
06 Oct 2022

J. Mater. Chem. A, 2022,10, 23675-23682

High-rate electrochemical lithium-ion storage through Li+ intercalation pseudocapacitance in the Pr1/3NbO3 anode

G. Liang, L. Yang, X. Xiong, X. Liu, X. Zhang and R. Che, J. Mater. Chem. A, 2022, 10, 23675 DOI: 10.1039/D2TA03741F

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