A Yolk-Shell-Structured FePO(4)Cathode for High-Rate and Long-Cycling Sodium-Ion Batteries
Zhang, ZZ (Zhang, Zhuangzhuang)[ 1 ] ; Du, YC (Du, Yichen)[ 1 ] ; Wang, QC (Wang, Qin-Chao)[ 2 ] ; Xu, JY (Xu, Jingyi)[ 1 ] ; Zhou, YN (Zhou, Yong-Ning)[ 2 ] ; Bao, JC (Bao, Jianchun)[ 1 ] ; Shen, J (Shen, Jian)[ 1 ]*（沈健）; Zhou, XS (Zhou, Xiaosi)[ 1 ]*（周小四）

[ 1 ] Nanjing Normal Univ, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Sch Chem & Mat Sci, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Peoples R China
[ 2 ] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION，202008,10.1002/anie.202008318

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 FePO(4)yolk-shell nanospheres with mesoporous nanoyolks supported inside the robust porous outer nanoshells. Their unique architecture and large surface area enable these amorphous FePO(4)yolk-shell nanospheres to manifest remarkable sodium storage properties with high reversible capacity, outstanding rate performance, and ultralong cycle life.

文章链接：
https://onlinelibrary.wiley.com/doi/full/10.1002/anie.202008318

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