Correlation between Microstructure and Na Storage Behavior in Hard Carbon

Biao Zhang, Camélia Matei Ghimbeu, Christel Laberty, Cathie Vix-Guterl, Jean Marie Tarascon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

205 Citations (Scopus)

Abstract

KGaA, Weinheim. Hard carbons are considered among the most promising anode materials for Na-ion batteries. Understanding their structure is of great importance for optimizing their Na storage capabilities and therefore achieving high performance. Herein, carbon nanofibers (CNFs) are prepared by electrospinning and their microstructure, texture, and surface functionality are tailored through carbonization at various temperatures ranging from 650 to 2800 °C. Stepwise carbonization gradually removes the heteroatoms and increases the graphitization degree, enabling us to monitor the corresponding electrochemical performance for establishing a correlation between the CNFs characteristics and Na storage behavior. Outstandingly, it is found that for CNFs carbonized at above 2000 °C, a single voltage Na uptake plateau at ≈0.1 V with a capacity of ≈200 mAh g-1. This specific performance may be nested in the higher degree of graphitization, lower active surface area, and different porous texture of the CNFs at such temperatures. It is demonstrated via the assembly of a CNF/Na2Fe2(SO4)3cell the benefit of such CNFs electrode for enhancing the energy density of full Na-ion cells. This finding sheds new insights in the quest for high performance carbon based anode materials.
Original languageEnglish
Article number1501588
JournalAdvanced Energy Materials
Volume6
Issue number1
DOIs
Publication statusPublished - 7 Jan 2016
Externally publishedYes

Keywords

  • carbon nanofibers
  • hard carbons
  • microstructures
  • Na-ion batteries

ASJC Scopus subject areas

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

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