TY - JOUR
T1 - Activating the Inert Na1 Sites in Na2FePO4F Toward High Performance Sodium Storage
AU - Huang, Huiqin
AU - Xia, Yufan
AU - Hao, Youchen
AU - Li, Haosheng
AU - Wang, Caiyun
AU - Shi, Tingting
AU - Lu, Xingyu
AU - Shahzad, Muhammad Wakil
AU - Xu, Ben Bin
AU - Jiang, Yinzhu
N1 - Generated from Scopus record by KAUST IRTS on 2023-09-23
PY - 2023/1/1
Y1 - 2023/1/1
N2 - Na2FePO4F, an iron-based fluorophosphate with facile 2D sodium ion channels, is considered as a promising cathode material for sodium-ion batteries because of low cost, resource abundance, and nontoxicity. However, its application is considerably restricted by the limited intrinsic electronic conductivity and specific capacity. Herein, a doping strategy represented by Cu2+ is proposed to boost the electrochemical performance, attributed to the derivation of a new active Na3 site originated from the inert Na1 site and the band gap reduction due to the d-orbital hybridization. Consequently, the as-obtained Na2Fe0.95Cu0.05PO4F/C composite can deliver an excellent rate capacity of 74 mAh g⁻1 at 20 C and a decent specific capacity of 119 mAh g⁻1 at 0.1 C, which is superior to the previously reported Na2FePO4F-based cathode materials. This study sheds new light on developing high performance fluorophosphates cathode materials via regulating the Na site and electronic structure.
AB - Na2FePO4F, an iron-based fluorophosphate with facile 2D sodium ion channels, is considered as a promising cathode material for sodium-ion batteries because of low cost, resource abundance, and nontoxicity. However, its application is considerably restricted by the limited intrinsic electronic conductivity and specific capacity. Herein, a doping strategy represented by Cu2+ is proposed to boost the electrochemical performance, attributed to the derivation of a new active Na3 site originated from the inert Na1 site and the band gap reduction due to the d-orbital hybridization. Consequently, the as-obtained Na2Fe0.95Cu0.05PO4F/C composite can deliver an excellent rate capacity of 74 mAh g⁻1 at 20 C and a decent specific capacity of 119 mAh g⁻1 at 0.1 C, which is superior to the previously reported Na2FePO4F-based cathode materials. This study sheds new light on developing high performance fluorophosphates cathode materials via regulating the Na site and electronic structure.
UR - https://onlinelibrary.wiley.com/doi/10.1002/adfm.202305109
UR - http://www.scopus.com/inward/record.url?scp=85164750341&partnerID=8YFLogxK
U2 - 10.1002/adfm.202305109
DO - 10.1002/adfm.202305109
M3 - Article
SN - 1057-9257
JO - Advanced Functional Materials
JF - Advanced Functional Materials
ER -