用于高倍率长循环钠离子电池的蛋黄壳结构磷酸铁阴极
A Yolk-Shell-Structured FePO Cathode for High-Rate and Long-Cycling Sodium-Ion Batteries.
作者信息
Zhang Zhuangzhuang, Du Yichen, Wang Qin-Chao, Xu Jingyi, Zhou Yong-Ning, Bao Jianchun, Shen Jian, Zhou Xiaosi
机构信息
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.
Department of Materials Science, Fudan University, Shanghai, 200433, China.
出版信息
Angew Chem Int Ed Engl. 2020 Sep 28;59(40):17504-17510. doi: 10.1002/anie.202008318. Epub 2020 Aug 11.
Amorphous iron phosphate (FePO ) 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 yolk-shell nanospheres with mesoporous nanoyolks supported inside the robust porous outer nanoshells. Their unique architecture and large surface area enable these amorphous FePO yolk-shell nanospheres to manifest remarkable sodium storage properties with high reversible capacity, outstanding rate performance, and ultralong cycle life.
非晶态磷酸铁（FePO₄）作为一种有前景的钠离子电池（SIBs）正极材料，因其高理论比容量和优异的电化学可逆性而备受关注。然而，其低倍率性能和快速的容量衰减严重阻碍了它在钠离子电池中的应用。在此，我们展示了一种巧妙的多步模板法，巧妙地制备出具有介孔纳米蛋黄的非晶态FePO₄蛋黄壳纳米球，其坚固的多孔外纳米壳内部支撑着介孔纳米蛋黄。它们独特的结构和大表面积使这些非晶态FePO₄蛋黄壳纳米球表现出卓越的储钠性能，具有高可逆容量、出色的倍率性能和超长的循环寿命。
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