@article{Wei2017, 
author = {Xiujuan Wei and Chunjuan Tang and Qinyou An and Mengyu Yan and Xuanpeng Wang and Ping Hu and Xinyin Cai and Liqiang Mai},
title = {FeSe2 clusters with excellent cyclability and rate capability for sodium-ion batteries},
year = {2017},
journal = {Nano Research},
volume = {10},
number = {9},
pages = {3202-3211},
keywords = {sodium-ion batteries, superior rate capability, pseudocapacitive behavior, FeSe2 clusters, excellent cycling stability},
url = {https://www.sciopen.com/article/10.1007/s12274-017-1537-z},
doi = {10.1007/s12274-017-1537-z},
abstract = {Sodium-ion batteries (SIBs) have great promise for sustainable and economical energy-storage applications. Nevertheless, it is a major challenge to develop anode materials with high capacity, high rate capability, and excellent cycling stability for them. In this study, FeSe2 clusters consisting of nanorods were synthesized by a facile hydrothermal method, and their sodium-storage properties were investigated with different electrolytes. The FeSe2 clusters delivered high electrochemical performance with an ether-based electrolyte in a voltage range of 0.5–2.9 V. A high discharge capacity of 515 mAh·g–1 was obtained after 400 cycles at 1 A·g–1, with a high initial columbic efficiency of 97.4%. Even at an ultrahigh rate of 35 A·g–1, a specific capacity of 128 mAh·g–1 was achieved. Using calculations, we revealed that the pseudocapacitance significantly contributed to the sodium-ion storage, especially at high current rates, leading to a high rate capability. The high comprehensive performance of the FeSe2 clusters makes them a promising anode material for SIBs.}
}