DataVXAdvanced Functional MaterialsPaper
journal article·2023-11Open access

Activating the Inert Na1 Sites in Na2FePO4F Toward High Performance Sodium Storage

Huiqin Huang, Yufan Xia, Youchen Hao, Haosheng Li, Caiyun Wang, Tingting Shi, Xingyu Lu, Muhammad Wakil Shahzad, Ben Bin Xu, Yinzhu Jiang

Advanced Functional Materials· Volume 33· Issue 47
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Source abstract

Abstract

Abstract 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.
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Research context

Energy storageComposites

OpenAlex topics: Advancements in Battery Materials · Chemical Synthesis and Characterization · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

Future Science Research Institute ZJU‐Hangzhou Global Scientific and Technological Innovation Centre Zhejiang University Hangzhou 311215 China

Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou Guangdong 510632 China

Instrumentation and Service Center for Molecular Sciences Westlake University Hangzhou 310024 China

Mechanical and Construction Engineering Faculty of Engineering and Environment Northumbria University Newcastle upon Tyne NE1 8ST UK

State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare Earths Baotou 014030 China

Funding

Fundamental Research Funds for the Central Universities

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