Volume 59, Issue 40 pp. 17504-17510
Communication

A Yolk–Shell-Structured FePO4 Cathode for High-Rate and Long-Cycling Sodium-Ion Batteries

Zhuangzhuang Zhang

Zhuangzhuang Zhang

Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

These authors contributed equally to this work.

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Yichen Du

Yichen Du

Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

These authors contributed equally to this work.

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Dr. Qin-Chao Wang

Dr. Qin-Chao Wang

Department of Materials Science, Fudan University, Shanghai, 200433 China

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Jingyi Xu

Jingyi Xu

Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

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Prof. Yong-Ning Zhou

Prof. Yong-Ning Zhou

Department of Materials Science, Fudan University, Shanghai, 200433 China

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Prof. Jianchun Bao

Prof. Jianchun Bao

Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

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Prof. Jian Shen

Corresponding Author

Prof. Jian Shen

Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

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Prof. Xiaosi Zhou

Corresponding Author

Prof. Xiaosi Zhou

Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China

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First published: 30 June 2020
Citations: 304

Graphical Abstract

FePO4 nanospheres consisting of mesoporous nanoyolks supported inside robust porous nanoshells are synthesized by a judicious multi-step templating strategy using carbon nanospheres as the starting material. Their architecture and composition allow these hierarchical FePO4 yolk–shell nanospheres to manifest excellent sodium storage performance as a cathode material for sodium-ion batteries.

Abstract

Amorphous iron phosphate (FePO4) has attracted enormous attention as a promising cathode material for sodium-ion batteries (SIBs) because of its high theoretical specific capacity and superior electrochemical reversibility. Nevertheless, the low rate performance and rapid capacity decline seriously hamper its implementation in SIBs. Herein, we demonstrate a sagacious multi-step templating approach to skillfully craft amorphous FePO4 yolk–shell nanospheres with mesoporous nanoyolks supported inside the robust porous outer nanoshells. Their unique architecture and large surface area enable these amorphous FePO4 yolk–shell nanospheres to manifest remarkable sodium storage properties with high reversible capacity, outstanding rate performance, and ultralong cycle life.

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