5 years ago

Improved Sodium-Ion Storage Performance of Ultrasmall Iron Selenide Nanoparticles

Improved Sodium-Ion Storage Performance of Ultrasmall Iron Selenide Nanoparticles
Na Han, Liang Cheng, Tianpin Wu, Yanguang Li, Sida Shen, Feipeng Zhao, Junhua Zhou, Lu Ma, Jun Lu, Hualin Ye
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 nonpolar organic solvents. In ether-based electrolyte, FeSe2 nanoparticles exhibited a large specific capacity of ∼500 mAh/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.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b00915

DOI: 10.1021/acs.nanolett.7b00915

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