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Electrospun Nd 3+ ‐Doped LiMn 2 O 4 Nanofibers as High‐Performance Cathode Material for Li‐Ion Capacitors
Author(s) -
Vijayan Shobana,
Kirubasankar Balakrishnan,
Pazhamalai Parthiban,
Solarajan Arun Kumar,
Angaiah Subramania
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700161
Subject(s) - materials science , electrospinning , dielectric spectroscopy , analytical chemistry (journal) , nanofiber , cathode , scanning electron microscope , anode , cyclic voltammetry , raman spectroscopy , chemical engineering , electrolyte , thermogravimetric analysis , electrochemistry , nanotechnology , composite material , electrode , chemistry , physics , engineering , chromatography , optics , polymer
Electrospun high‐voltage spinel‐typeLiNd 0.01 Mn 1.99 O 4 nanofibers (LNdMO NFs) were successfully prepared through the electrospinning technique. The thermal behavior of the electrospun precursor fibrous mat was assessed by thermogravimetric/differential thermal analysis. The crystallite structure and phase purity of Nd 3+ ‐doped LiMn 2 O 4 was confirmed by X‐ray diffraction studies. The chemical structure of the electrospun LNdMO NFs was characterized by Raman spectroscopy studies. The morphology of the nanofibers was examined by using field‐emission scanning electron microscopy. A Li‐ion capacitor (LIC) coin cell was fabricated by using high‐voltage insertion LNdMO NFs as the cathode and black pearl carbon as the anode with electrospun PVdF membrane containing 1 M LiNO 3 as the separator and electrolyte. The electrochemical performance of the assembled LIC coin cell was characterized by using cyclic voltammetry, galvanostatic charge−discharge and electrochemical impedance spectroscopy. The LIC was capable of operating over wide potential window of 1.6 V with excellent capacitance retention of 86 % even after 2500 continuous galvanostatic charge−discharge cycles at a constant current density of 1 A g −1 . Furthermore, LIC delivered an energy density of 17 Wh kg −1 and a power density of 397 W kg −1 . Moreover, these results show that Nd 3+ ‐doped LiMn 2 O 4 NFs can be considered a promising electroactive cathode material for LICs.