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 language | English |
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Article number | 103675 |
Number of pages | 10 |
Journal | Energy Storage Materials |
Volume | 71 |
DOIs | |
Publication status | Published - 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