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High‐Performance Sb/Sb 2 O 3 Anode Materials Using a Polypyrrole Nanowire Network for Na‐Ion Batteries
Author(s) -
Nam DoHwan,
Hong KyungSik,
Lim SungJin,
Kim MinJoong,
Kwon HyukSang
Publication year - 2015
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201500491
Subject(s) - polypyrrole , materials science , anode , nanowire , electrode , electrochemistry , scanning electron microscope , current density , substrate (aquarium) , chemical engineering , analytical chemistry (journal) , nanotechnology , composite material , chemistry , organic chemistry , physics , oceanography , quantum mechanics , geology , engineering
Three‐dimensional porous Sb/Sb 2 O 3 anode materials are successfully fabricated using a simple electrodeposition method with a polypyrrole nanowire network. The Sb/Sb 2 O 3 –PPy electrode exhibits excellent cycle performance and outstanding rate capabilities; the charge capacity is sustained at 512.01 mAh g −1 over 100 cycles, and 56.7% of the charge capacity at a current density of 66 mA g −1 is retained at 3300 mA g −1 . The improved electrochemical performance of the Sb/Sb 2 O 3 –PPy electrode is attributed not only to the use of a highly porous polypyrrole nanowire network as a substrate but also to the buffer effects of the Sb 2 O 3 matrix on the volume expansion of Sb. Ex situ scanning electron microscopy observation confirms that the Sb/Sb 2 O 3 –PPy electrode sustains a strong bond between the nanodeposits and polypyrrole nanowires even after 100 cycles, which maintains good electrical contact of Sb/Sb 2 O 3 with the current collector without loss of the active materials.