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Graphene/V 2 O 5 Cryogel Composite As a High‐Energy Cathode Material For Lithium‐Ion Batteries
Author(s) -
Maroni Fabio,
Birrozzi Agnese,
Carbonari Gilberto,
Croce Fausto,
Tossici Roberto,
Passerini Stefano,
Nobili Francesco
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.201600798
Subject(s) - materials science , nanosheet , electrolyte , graphene , nanocomposite , dielectric spectroscopy , cathode , lithium (medication) , chemical engineering , composite number , electrochemistry , amorphous solid , composite material , electrode , nanotechnology , organic chemistry , chemistry , medicine , endocrinology , engineering
This work reports the synthesis and characterization of an amorphous V 2 O 5 cryogel/graphene nanosheet composite as a high‐performance cathode material. The optimization of electrode processing is conducted by using the environmentally friendly poly acrylic acid as the binder and ethanol as the solvent. The nanocomposite material shows outstanding capacity values, exceeding 300 mAhg −1 reversible capacity upon galvanostatic cycling tests at 280 mAg −1 (C/2 charge/discharge rate), and more than 100 mAhg −1 at 5600 mAg −1 (10C). A subsequent electrochemical impedance spectroscopy study gives useful insights into the cathode/electrolyte interface.