Journal
SMALL
Volume 16, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202002671
Keywords
boron nitride nanofibers; density functional theory simulations; FES analysis; Na3V2O2(PO4)(2)F; Ti3C2X cathode; sodium metal anodes
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Funding
- City University of Hong Kong (CityU Internal Funds for External Grant Schemes Project) [9678157]
- Hong Kong Innovation and Technology Commission [ITS/219/19]
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Sodium metal anode, featuring high capacity, low voltage and earth abundance, is desirable for building advanced sodium-metal batteries. However, Na-ion deposition typically leads to morphological instability and notorious chemical reactivity between sodium and common electrolytes still limit its practical application. In this study, a porous BN nanofibers modified sodium metal (BN/Na) electrode is introduced for enhancing Na-ion deposition dynamics and stability. As a result, symmetrical BN/Na cells enable an impressive rate capability and markedly enhanced cycling durability over 600 h at 10 mA cm(-2). Density functional theory simulations demonstrate BN could effectively improve Na-ion adsorption and diffusion kinetics simultaneously. Finite element simulation clearly reveals the intrinsic smoothing effect of BN upon multiple Na-ion plating/stripping cycles. Coupled with a Na3V2O2(PO4)(2)F/Ti3C2X cathode, sodium metal full cells offer an ultrastable capacity of 125/63 mA h g(-1)(approximate to 420/240 Wh kg(-1)) at 0.05/5 C rate over 500 cycles. These comprehensive analyses demonstrate the feasibility of BN/Na anode for the establishment of high-energy-density sodium-metal full batteries.
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