题目：

Improved Sodium-Ion Storage Performance of Ultrasmall Iron Selenide Nanoparticles

作者：

Feipeng Zhao,¹ Sida Shen,¹ Liang Cheng,¹ Lu Ma,² Junhua Zhou,¹ Hualin Ye,¹ Na Han,¹ Tianpin Wu,²Yanguang Li,*¹ and Jun Lu*³

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, P. R. China

²Advanced Photon Sources, X-ray Science Division, Argonne National Laboratory, Lemont, IL 60439, USA

³Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA

摘要：

Sodium-ion batteries are potential low-cost alternatives to current lithium-ion technology, yet their performances still fall short of expectation due to the lack of suitable electrode materials with large capacity, long-term cycling stability and high-rate performance. In this work, we demonstrated that ultrasmall (~5 nm) iron selenide (FeSe₂) nanoparticles exhibited a remarkable activity for sodium-ion storage. They were prepared from a high-temperature solution method with a narrow size distribution and high yield, and could be readily redispersed in non-polar organic solvents. In ether-based electrolyte, FeSe₂ nanoparticles exhibited a large specific capacity of ~500mAh/g (close to the theoretical limit), high rate capability with ~250 mAh/g retained at 10 A/g, and excellent cycling stability at both low and high current rates by virtue of their advantageous nanosizing effect. Full sodium-ion batteries were also constructed from coupling FeSe₂ with NASICON-type Na₃V₂(PO₄)₃ cathode, and demonstrated impressive capacity and cycle ability.

影响因子：

12.712

分区情况：

一区

链接：

http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b00915