Morphology, chemistry, performance trident: Insights from hollow, mesoporous carbon nanofibers for dendrite-free sodium metal batteries

Nauman Mubarak, Faisal Rehman, Junxiong Wu, Muhammad Ihsan-Ul-Haq, Yang Li, Yunhe Zhao, Xi Shen, Zhengtang Luo, Baoling Huang, Jang Kyo Kim

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)

Abstract

The potential application of metallic Na anodes for high energy density batteries is plagued by dendrite formation accompanied by rapid consumption of electrolyte and Na metal. Herein, coaxially electrospun, hollow and mesoporous carbon nanofiber (HpCNF) hosts possessing strong affinity with Na are developed for Na metal batteries. The combined in situ and cryogenic microscopy along with theoretical simulations reveal that the highly sodiophilic HpCNFs with abundant defects and nitrogen functional groups enable compact, uniform plating of Na with excellent reversibility aided by the resilient, fluorine-rich SEI layer. Thanks to the optimized Na deposition in the entire structure, the Na@HpCNF anodes present an average Coulombic efficiency of 99.7% after 1,400 cycles at a current density of 3 mA cm−2 and a plating/striping capacity of 6 mAh cm−2. Their symmetric cell maintains stable cycles for over 1000 hr at 5 mA cm−2 and 5 mAh cm−2, which is among the best when compared with state-of-the-art electrodes. The full cells paired with a Na3V2(PO4)2F3 cathode deliver remarkable specific capacities of 115 and 93 mAh cm−2 after 500 cycles at 1 C and 200 cycles at 4 C, respectively. These findings highlight new insight into rationally-designed metal anodes towards the development of high-performance metal batteries.

Original languageEnglish
Article number106132
JournalNano Energy
Volume86
DOIs
Publication statusPublished - Aug 2021
Externally publishedYes

Keywords

  • Cryo-EM
  • Hollow mesoporous carbon nanofibers
  • In-situ TEM
  • Na metal battery
  • Solid electrolyte interphase (SEI)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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