Porous BN Nanofibers Enable Long-Cycling Life Sodium Metal Batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number2002671
Journal / PublicationSmall
Volume16
Issue number34
Online published21 Jul 2020
Publication statusPublished - 27 Aug 2020

Abstract

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)2F/Ti3C2X cathode, sodium metal full cells offer an ultrastable capacity of 125/63 mA h g−1 (≈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.

Research Area(s)

  • boron nitride nanofibers, density functional theory simulations, FES analysis, Na 3V 2O 2(PO 4) 2F/Ti 3C 2X cathode, sodium metal anodes

Citation Format(s)

Porous BN Nanofibers Enable Long-Cycling Life Sodium Metal Batteries. / Wang, Hui; Liang, Jianli; Wu, Yan; Kang, Tianxing; Shen, Dong; Tong, Zhongqiu; Yang, Rui; Jiang, Yang; Wu, Di; Li, Xinjian; Lee, Chun-Sing.

In: Small, Vol. 16, No. 34, 2002671, 27.08.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review