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Correlation Between Microstructure and Na Storage Behavior in Hard Carbon
Author(s) -
Zhang Biao,
Ghimbeu Camélia Matei,
Laberty Christel,
VixGuterl Cathie,
Tarascon JeanMarie
Publication year - 2016
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201501588
Subject(s) - carbonization , microstructure , materials science , carbon nanofiber , anode , heteroatom , electrospinning , carbon fibers , porosity , chemical engineering , texture (cosmology) , nanofiber , electrochemistry , nanotechnology , specific surface area , electrode , composite material , scanning electron microscope , chemistry , catalysis , organic chemistry , composite number , ring (chemistry) , image (mathematics) , artificial intelligence , carbon nanotube , computer science , engineering , polymer
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/Na 2 Fe 2 (SO 4 ) 3 cell 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.