Manipulation of Na3V2(PO4)2F3 via aluminum doping to alter local electron states toward an advanced cathode for sodium-ion batteries

With its unique 3D skeleton structure and exceptional cyclic stability, the Na + superionic conductor (NASICON)-type Na 3 V 2 (PO 4 ) 2 F 3 (NVPF) has been considered as a competitive cathode material for advanced Na-ion batteries. However, the release of fluorine during the heat treatment leads to...

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Bibliographic Details
Published in:Rare metals Vol. 43; no. 9; pp. 4253 - 4262
Main Authors: Wang, Shi-Min, Li, Jin-Qi, Xu, Li, Sun, Meng-Jiao, Huang, Wen-Jin, Liu, Qing, Ren, Fu-Tong, Sun, Yong-Jiang, Duan, Ling-Yan, Ma, Hang, Guo, Hong
Format: Journal Article
Language:English
Published: Beijing Nonferrous Metals Society of China 01.09.2024
Subjects:
Biomaterials
Cathode
Chemistry and Materials Science
Doping
Electrochemistry
Energy
Materials Engineering
Materials Science
Metallic Materials
Nanoscale Science and Technology
NASICON
Original Article
Physical Chemistry
Sodium‐ion energy storage batteries
Electrochemistry
Sodium-ion energy storage batteries
Cathode
NASICON
Doping
ISSN:1001-0521, 1867-7185
Online Access:Get full text
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Summary:With its unique 3D skeleton structure and exceptional cyclic stability, the Na + superionic conductor (NASICON)-type Na 3 V 2 (PO 4 ) 2 F 3 (NVPF) has been considered as a competitive cathode material for advanced Na-ion batteries. However, the release of fluorine during the heat treatment leads to the formation of an additional phase Na 3 V 2 (PO 4 ) 3 (NVP), which results in a low-voltage plateau and compromises the energy density. Herein, we modulate the local electronic states of the V site by aluminum substitution to strengthen the stability of F. The results confirm that the aluminum introduction not only changes the local electron states of V sites, significantly reducing the formation of NVP by-product from 6.71 wt% to 1.01 wt%, but also effectively reduces the band gap, improving the electronic conductivity of NVPF. The optimized Na 3 V 1.9 Al 0.1 (PO 4 ) 2 F 3 exhibits higher energy density of 340 Wh·kg −1 and excellent rate performance of 106.7 mAh·g −1 at 10C compared with the pristine cathode. Graphical abstract
Bibliography:The online version contains supplementary material available at
https://doi.org/10.1007/s12598‐024‐02777‐8
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Supplementary Information
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ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-024-02777-8