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A Yolk–Shell‐Structured FePO 4 Cathode for High‐Rate and Long‐Cycling Sodium‐Ion Batteries
Author(s) -
Zhang Zhuangzhuang,
Du Yichen,
Wang QinChao,
Xu Jingyi,
Zhou YongNing,
Bao Jianchun,
Shen Jian,
Zhou Xiaosi
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202008318
Subject(s) - amorphous solid , mesoporous material , materials science , cathode , chemical engineering , electrochemistry , sodium , nanotechnology , porosity , cycling , iron phosphate , ion , phosphate , electrode , chemistry , composite material , metallurgy , catalysis , organic chemistry , engineering , archaeology , history
Amorphous iron phosphate (FePO 4 ) 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.