FeSe2 nanoparticle embedded in 3D honeycomb-like N-doped carbon architectures coupled with electrolytes engineering boost superior potassium ion storage
Type
ArticleAuthors
Min, HaoLi, Minghua
Shu, Hongbo
Zhang, Xiaoqing
Hu, Ting
Wang, Wenxi
Zhou, Yujin
Jian, Jian
Wang, Xianyou

KAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Date
2020-10-30Online Publication Date
2020-10-30Print Publication Date
2021-01Embargo End Date
2022-11-11Submitted Date
2020-08-18Permanent link to this record
http://hdl.handle.net/10754/666073
Metadata
Show full item recordAbstract
Potassium ion batteries (KIB) have been considered as helpful alternative energy storage devices owing to the low-cost and abundant potassium sources. However, it is a critical challenge to explore suitable anode materials and electrolytes for adapting large radius and high activity of K ions. In this study, a novel FeSe2 nanoparticle embedded in 3D honeycomb-like N-doped carbon architectures (FeSe2-NC) is synthesized through a simple solid-state strategy. Such unique architecture structure can not only provide a high-way for electron and K+ transport, but also effectively alleviate volume variation during long-term K+ intercalation/deintercalation process. Hence, FeSe2-NC as anode materials for KIB display a high discharge capacity of 460 mAh g−1 at 100 mA g−1 and excellent long-term cycling stability even at a high current density of 2 A g−1. Beyond the electrochemical performance, it is found that storage K+ of FeSe2-NC represents a conversion mechanism during discharge/charge in KIB. Furthermore, regulating the electrolyte salts via replacing potassium bis(fluorosulfonyl)imide (KFSI) electrolyte with potassium hexafluorophosphate (KPF6) electrolyte can form a more uniform and robust solid electrolyte interphase film, which be responsible for the enhanced electrochemical performance. Therefore, it is helpful to understand the fundamentals of FeSe2-NC and promote the practical application of KIB.Citation
Min, H., Li, M., Shu, H., Zhang, X., Hu, T., Wang, W., … Wang, X. (2021). FeSe2 nanoparticle embedded in 3D honeycomb-like N-doped carbon architectures coupled with electrolytes engineering boost superior potassium ion storage. Electrochimica Acta, 366, 137381. doi:10.1016/j.electacta.2020.137381Sponsors
This work is support financially by the National Natural Science Foundation of China (Nos. 51502256, 51602101), Hunan Provincial Natural Scientific Foundation of China (Nos. 2017JJ3297, 2018JJ3144), Scientific Research Projects of Hunan Provincial Strategic Emerging Industries (No. 2016GK4030), China Postdoctoral Science Foundation (No. 2014M552142), Hunan Provincial Education Office Foundation of China (Nos. 17C1523, 19A261) and Scientific Research Fund of Xiangtan University (Nos. 2018HJYH08; 2015SEP03; 13QDZ30; 2014XZX07; 2018ZKKF03).Publisher
Elsevier BVJournal
Electrochimica ActaAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S0013468620317746ae974a485f413a2113503eed53cd6c53
10.1016/j.electacta.2020.137381