Nano

SKKU Advanced Institute of Nano Technology (성균관대학교 성균나노과학기술원)
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Controlled Synthesis of FeSe2 Nanoflakes Toward Advanced Sodium Storage Behavior Integrated with Ether-Based Electrolyte

  • Chen, Yalan (College of Science, State Key Laboratory of Heavy Oil Processing and College of Chemical Engineering China University of Petroleum) ;
  • Zhang, Jingtong (College of Science, State Key Laboratory of Heavy Oil Processing and College of Chemical Engineering China University of Petroleum) ;
  • Liu, Haijun (College of Science, State Key Laboratory of Heavy Oil Processing and College of Chemical Engineering China University of Petroleum) ;
  • Wang, Zhaojie (College of Science, State Key Laboratory of Heavy Oil Processing and College of Chemical Engineering China University of Petroleum)
  • Received : 2018.07.17
  • Accepted : 2018.10.30
  • Published : 2018.12.31
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Abstract

Sodium ion batteries based on the more sodium source reserve than that of lithium have been designed as promising alternatives to lithium ion batteries. However, several problems including unsatisfied specific capacity and serious cyclic stability must be solved before the reality. One of the effective approaches to solve the abovementioned problems is to search for suitable anode materials. In this work, we designed and prepared $FeSe_2$ nanoflakes via a simple hydrothermal method which can be adjusted in composition by Fe precursor. As a potential anode for sodium storage, the optimized $FeSe_2$ electrode was further evaluated in different electrolytes of $NaClO_4$ in propylene carbonate/fluoroethylene carbonate and $NaCF_3SO_3$ in diethylene glycol dimethyl ether. The capacity was about $470mAh\;g^{-1}$ and $535mAh\;g^{-1}$ at $0.5A\;g^{-1}$, respectively, in the voltage between 0.5 V and 2.9 V in the cycle of stabilization phase. Superior performance both in capacity and in stability was obtained in ether-based electrolyte, which affords the property without plugging the intermediates of transition metal dichalcogenides during charge/discharge processes.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Shandong Natural Science Foundation, Central Universities

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