NDLI: Cobalt-doped mesoporous carbon nanofibres as free-standing cathodes for lithium

Content Provider	Springer Nature Link
Author	Martinez Crespiera, Sandra Amantia, David Knipping, Etienne Aucher, Christophe Aubouy, Laurent Amici, Julia Zeng, Juqin Zubair, Usman Francia, Carlotta Bodoardo, Silvia
Copyright Year	2017
Abstract	Herein, we present binder-free O$_{2}$ electrodes of mesoporous carbon nanofibres and Co nanoparticles (Co-doped CNF). Such electrodes are synthesized using electrospinning techniques coupled with subsequent thermal treatments. The fibre-based mats behave as free-standing electrodes due to the presence of 3D cross-linked web structures, and thus additional metal mesh or gas diffusion layer supports are not required. The absence of polymeric binders in the cathode avoids side reactions due to binder instability during cell cycling. The Co-doped CNFs are characterized by field emission scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy, X-ray diffraction and Raman analysis. CNFs are decorated by homogeneously distributed Co (0) nanoparticles, with sizes in the range of 10–50 nm and Co content lower than 10 wt%. N$_{2}$ adsorption–desorption measurements show that the specific surface area of the CNFs is greatly affected by incorporation of the metal nanoparticles. The introduction of Co nanoparticles enhances the degree of graphitization of the CNFs, which is beneficial to CNF conductivity. Measured BET surface areas of Co-doped CNFs are in the range of 40–300 m$^{2}$ g$^{− 1}$, depending on Co content. Results show that the Li–O$_{2}$ cell comprising the Co-doped CNF free-standing cathodes can deliver specific capacities of 3700 mA h g$^{− 1}$ based on the total mass of the electrodes and good cycling performance is achieved at the curtailed capacity of 100 mA h g$^{− 1}$. The good performance of the Co-doped CNFs may be attributed to the mesoporous structure of CNFs which could facilitate the deposition of solid products during discharge and decrease the mass transport resistance. Different morphologies of the Li$_{2}$O$_{2}$ crystals obtained during discharge with Co-doped CNF cathodes support the hypothesis that the presence of Co may induce alterations by forming easily decomposable Li$_{2}$O$_{2}$.
Starting Page	497
Ending Page	506
Page Count	10
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	47
Issue Number	4
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-02-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Li–air battery Cobalt-doped carbon nanofibers Carbon nanofibers Electrospinning Lithium peroxide Electrochemistry Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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