Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/66549
Title: Stable freestanding Li-ion battery cathodes by in situ conformal coating of conducting polypyrrole on NiS-carbon nanofiber films
Authors: Li, XY
Chen, YM
Zou, JZ
Zeng, XR
Zhou, LM 
Huang, HT 
Keywords: NiS
Polypyrrole
Freestanding electrodes
Lithium-ion battery
Issue Date: 2016
Publisher: Elsevier
Source: Journal of power sources, 1 Nov. 2016, v. 331, p. 360-365 How to cite?
Journal: Journal of power sources 
Abstract: Nickel sulfide (NiS) is an attractive and promising cathode material for lithium ion batteries (LIBs) with a high theoretical capacity of 590 mAh g(-1), which is much higher than that of LiMO2 (M = Co, Fe, Mn, etc.). Here, we demonstrate a facile synthesis of hybrid materials by in situ polymerization of a conducting polymer of polypyrrole (PPy) on NiS-carbon nanofiber (CNF) films to form high-performance free-standing LIB cathodes. PPy coating maintains the structural integrity and accommodates volumetric change of NiS upon cycling, and also helps enhance electronic conduction. CNF film provides a good mechanical and effective electrical interconnection in the entire electrode. Using the freestanding NiS-PPy-CNF hybrid film with a high NiS loading of 5.5 mg cm(-2) as a cathode, we demonstrate a high discharge capacity of 635 mAh g(-1) at 0.1 A g(-1) and exceptional areal capacity of 3.03 mAh cm(-2) at 0.7 mA cm(-2) with long cycling life over 700 cycles, representing the best performance of NiS-based electrodes so far.
URI: http://hdl.handle.net/10397/66549
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2016.09.067
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