Advanced Se3P4@C Anode with Exceptional Cycling Life for High Performance Potassium‐Ion Batteries

Potassium‐ion batteries have attracted increasing attention for next‐generation energy storage systems due to their high energy density and abundance of potassium. However, the lack of suitable anode highly hampers its practical application due to the large ionic radius of K+. Herein, a Se3P4@mesopo...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2020-02, Vol.16 (6), p.n/a
Main Authors: Li, Bing, He, Ziyao, Zhao, Jiawei, Liu, Wentao, Feng, Yangyang, Song, Jiangxuan
Format: Article
Language:English
Subjects:
Anodes
Carbon
Cycles
Decay rate
Energy storage
Flux density
Nanotechnology
phosphorus
Porous media
Potassium
potassium‐ion batteries
Rechargeable batteries
Se3P4
seleium
Storage batteries
Storage systems
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Summary:Potassium‐ion batteries have attracted increasing attention for next‐generation energy storage systems due to their high energy density and abundance of potassium. However, the lack of suitable anode highly hampers its practical application due to the large ionic radius of K+. Herein, a Se3P4@mesoporous carbon (Se3P4@C) composite is reported as a high‐performance anode for potassium‐ion batteries. The Se3P4@C composite is synthesized through an in situ combination reaction between red phosphorus and Se within a porous carbon matrix. In this way, the nano‐sized Se3P4 is well confined in the porous carbon and thus exhibits a close contact with the carbon matrix. This can significantly improve the conductivity and alleviate the volume change during the cycling process. As a result, the Se3P4@C exhibits a high reversible initial capacity of 1036.8 mAh g−1 at a current density of 50 mA g−1 as well as an excellent cycle performance with a capacity decay of 0.07% per cycle over 300 cycles under 1000 mA g−1. In terms of high specific capacity and stable cycling performance, the Se3P4@C anode is a promising candidate for advanced potassium‐ion batteries. A Se3P4@C anode with high capacity and exceptional cycling life is developed for potassium‐ion batteries. The synergistic effect between Se and P atom as well as the carbon host in the composite is clarified for playing a critical role in the excellent electrochemical performance.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201906595