Volume 63, Issue 40 e202410590
Research Article

Hollow Core-Shelled Na4Fe2.4Ni0.6(PO4)2P2O7 with Tiny-Void Space Capable Fast-Charge and Low-Temperature Sodium Storage

Xinran Qi

Xinran Qi

Department of Chemistry, College of Science, Hebei Agriculture University, Baoding, 071001 P.R. China

State Key Laboratory of Metastable Materials Science and Technology, Hebei Key Laboratory of Nano-biotechnology, Yanshan University, Qinhuangdao, 066004 China

These authors contributed equally to this work.

Contribution: Methodology (equal), Writing - original draft (lead)

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Hanghang Dong

Hanghang Dong

Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, 325035 China

These authors contributed equally to this work.

Contribution: Data curation (lead)

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Hao Yan

Hao Yan

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444 P. R. China

Contribution: Formal analysis (equal)

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Baoxiu Hou

Baoxiu Hou

Department of Chemistry, College of Science, Hebei Agriculture University, Baoding, 071001 P.R. China

Contribution: ​Investigation (equal)

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Haiyan Liu

Haiyan Liu

Department of Chemistry, College of Science, Hebei Agriculture University, Baoding, 071001 P.R. China

Contribution: Funding acquisition (equal)

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Ningzhao Shang

Ningzhao Shang

Department of Chemistry, College of Science, Hebei Agriculture University, Baoding, 071001 P.R. China

Contribution: Methodology (equal)

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Prof. Longgang Wang

Corresponding Author

Prof. Longgang Wang

State Key Laboratory of Metastable Materials Science and Technology, Hebei Key Laboratory of Nano-biotechnology, Yanshan University, Qinhuangdao, 066004 China

Contribution: Funding acquisition (equal), Project administration (equal)

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Prof. Jianjun Song

Corresponding Author

Prof. Jianjun Song

College of Physics, Qingdao University, Qingdao, 266071 China

Contribution: Writing - review & editing (equal)

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Prof. Shuangqiang Chen

Corresponding Author

Prof. Shuangqiang Chen

Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, 325035 China

Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444 P. R. China

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300071 China

Contribution: Resources (equal), Software (supporting), Writing - review & editing (lead)

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Shulei Chou

Shulei Chou

Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, 325035 China

Contribution: Writing - review & editing (equal)

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Prof. Xiaoxian Zhao

Corresponding Author

Prof. Xiaoxian Zhao

Department of Chemistry, College of Science, Hebei Agriculture University, Baoding, 071001 P.R. China

Contribution: Funding acquisition (lead), Supervision (lead), Writing - original draft (equal), Writing - review & editing (lead)

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First published: 18 June 2024
Citations: 38

Graphical Abstract

Hollow core–shell Na4Fe2.4Ni0.6(PO4)2P2O7 with tiny-void space was synthesized by one-step spray drying and calcination for the first time due to the different viscosity, coordination ability, ratios, and shrinkage rates between CA and PVP, which ensures high energy density and relieves volume expansion, combining with regulation on Na+ diffusion path and energy barrier by doping Ni to achieve fast charging and low-temperature sodium storage.

Abstract

Iron-based mixed polyanion phosphate Na4Fe3(PO4)2P2O7 (NFPP) is recognized as a promising cathode for Sodium-ion Batteries (SIBs) due to its low cost and environmental friendliness. However, its inherent low conductivity and sluggish Na+ diffusion limit fast charge and low-temperature sodium storage. This study pioneers a scalable synthesis of hollow core–shelled Na4Fe2.4Ni0.6(PO4)2P2O7 with tiny-void space (THoCS-0.6Ni) via a one-step spray-drying combined with calcination process due to the different viscosity, coordination ability, molar ratios, and shrinkage rates between citric acid and polyvinylpyrrolidone. This unique structure with interconnected carbon networks ensures rapid electron transport and fast Na+ diffusion, as well as efficient space utilization for relieving volume expansion. Incorporating regulation of lattice structure by doping Ni heteroatom to effectively improve intrinsic electron conductivity and optimize Na+ diffusion path and energy barrier, which achieves fast charge and low-temperature sodium storage. As a result, THoCS-0.6Ni exhibits superior rate capability (86.4 mAh g−1 at 25 C). Notably, THoCS-0.6Ni demonstrates exceptional cycling stability at −20 °C with a capacity of 43.6 mAh g−1 after 2500 cycles at 5 C. This work provides a universal strategy to design the hollow core–shelled structure with tiny-void space cathode materials for reversible batteries with fast-charge and low-temperature Na-storage features.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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