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Nanosphere ZnSe-Reduced Graphene Oxide as High-Performance Anodes for Sodium-ion Batteries: Phase Transition and Storage Mechanism Analysis
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  • Youngho Jin,
  • Honggyu Seong,
  • Joon Ha Moon,
  • Geongil Kim,
  • Wonbin Nam,
  • Yoo Hyerin ,
  • Taejung Jung,
  • MinHo Yang,
  • Se Youn Cho,
  • Jaewon Choi
Youngho Jin
Gyeongsang National University
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Honggyu Seong
Gyeongsang National University
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Joon Ha Moon
Gyeongsang National University
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Geongil Kim
Gyeongsang National University
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Wonbin Nam
Gyeongsang National University
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Yoo Hyerin
Gyeongsang National University
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Taejung Jung
Gyeongsang National University
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MinHo Yang
Dankook University - Cheonan Campus
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Se Youn Cho
Korea Institute of Science and Technology
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Jaewon Choi
Gyeongsang National University

Corresponding Author:[email protected]

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Abstract

Zinc selenide (ZnSe), a metal chalcogenide, is an attractive anode material for sodium-ion batteries, exhibiting high theoretical capacity (371.4 mAhg-1) and numerous redox sites. However, volume expansion and low stability during the charge/discharge processes present challenges. This study aimed to solve these inherent problems and synthesize a high-performance anode materials by growing and synthesizing nano sized ZnSe on surface of reduced graphene oxide (rGO). ZnSe has two crystal structures, namely zinc-blende and wurtzite, and undergoes a transformation from wurtzite to the zinc-blende phase during sodium ion storage. The study conducted X-ray diffraction analysis of the electrode after the galvanostatic charge/discharge test and performed cyclic voltammetry analysis to investigate the transformation process. In addition, real-time monitoring of Nyquist plot and phase transition was performed to investigate the mechanisms of sodium ion storage. The ZnSe-rGO, exhibiting conversion reactions, shows cycle performance of 316.14 mAhg-1 at a current density of 0.5 Ag-1 after 1000 cycles. The evaluation of anode materials and analysis of their storage mechanism can facilitate sodium-ion batteries research