Long-life and high-power Sodium-Selenium Batteries realized by Vanadium single atom catalyzed cathodes and tailored carbonate-based electrolytes

Hui Wang, Qi Qi, Fangyi Shi, Jingzhong Miao, Wanlong Bai, Beiming Li, Ye Wang (Corresponding Author), Tingting Xu, Dezhi Kong, Xinjian Li, Zheng Long Xu (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The practical implementation of resources-abundant sodium-selenium batteries (SSBs) has been retarded by the low-capacity utilization and poor reversibility from the sluggish conversion kinetics of selenides, the notorious polyselenides shuttling effect and the dendritic deposition of sodium metal. This work presents a rational design of vanadium single atom catalyst on nitrogen-doped carbon sheets (V-N-C) as selenium host to address the instability of cathodes. Density function theory calculations reveal the superiority of V-N4 in V-N-C over other transition metal and nitrogen atoms in facilitating the adsorption-diffusion-conversion of polyselenides. Se@V-N-C cathodes deliver a high capacity utilization (603 mAh g−1 at 0.1 C, over 89 % of theoretical capacity), excellent reversibility (470 mAh g-1 at 0.1 C after 500 cycles), and remarkably high-power cyclability (260 mAh g−1 at 5 C over 1000 cycles). The prolong cycle life can also be originated from our tailored NaPF6 carbonate electrolyte with 1 wt% LiDFBOP additive. The new electrolyte is illustrated to generate inorganic-rich solid electrolyte interphase layers to protect sodium metal anodes from polyselenides corrosion and dendritic deposition at high rates. Fundamental findings in this work present a two-pronged approach to the prevailing challenges in the nascent metal-selenium battery chemistry.

Original languageEnglish
Article number103675
Number of pages10
JournalEnergy Storage Materials
Volume71
DOIs
Publication statusPublished - Aug 2024

Keywords

  • LiDFBOP electrolyte additive
  • Polyselenides shuttling
  • Sodium-selenium battery
  • V-N-C single-atomic catalyst

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Energy Engineering and Power Technology

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