Effect of porosity on electrochemical properties of carbon materials as cathode for lithium-oxygen battery

Bok, Sang; Lee, Dong Joon; Roev, Victor; Im, Dongmin; Doo, Seok‐Gwang

doi:10.1016/j.jpowsour.2013.03.150

Cited by 65 publications

(49 citation statements)

References 18 publications

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“…Usually, materials with large surface area positively affect the cathode performance due to the rich electrochemically active sites for accumulating the discharge products. However, the cell's specific capacity depends more on the pore volume rather than on the surface area as large pore volumes are preferred to store lithium peroxide [31]. It has been reported [32][33][34] that the mesoporous volume is the most effective in oxide accommodation.…”

Section: Resultsmentioning

confidence: 99%

Cobalt-doped mesoporous carbon nanofibres as free-standing cathodes for lithium–oxygen batteries

et al. 2017

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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 .Abstract Herein, we present binder-free O 2 electrodes of mesoporous carbon nanofibres and Co nanoparticles (Codoped 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

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Section: Resultsmentioning

confidence: 99%

Cobalt-doped mesoporous carbon nanofibres as free-standing cathodes for lithium–oxygen batteries

et al. 2017

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“…Only disconnected and partical has thus far been established. For instance, it is found that mesopores were much more efficient in accommodating the reaction products than micropores in LABs [251]. Micropores were easily blocked by Li oxides during O 2 reduction, preventing further electrochemical reactions from taking place [231].…”

Section: Issues Facing Practical Applicationmentioning

confidence: 99%

Recent advances in electrospun carbon nanofibers and their application in electrochemical energy storage

Zhang

Kang

Tarascon

et al. 2016

Progress in Materials Science

642

378

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“…A c c e p t e d M a n u s c r i p t 19 The different pore structures and sizes of the carbon materials used as cathode materials for lithium-air batteries, such as carbon aerogels ranging in size between 10μm and 100 µm and activated carbon particles ranging in size between 5μm and 20 µm, affect the battery performance [61].…”

Section: Page 20 Of 70mentioning

confidence: 99%

“…Despite having a smaller surface area of 688 m 2 g -1 compared with the 1908 m 2 g -1 surface area of activated carbon, carbon aerogel has a larger pore volume (2.53 cm 3 g -1 ) compared with that of activated carbon (0.55 cm 3 g -1 ) and can therefore accommodate a larger volume of discharge product [61].…”

Section: Page 20 Of 70mentioning

confidence: 99%

Recent developments in materials for aluminum–air batteries: A review

Mokhtar

Talib

Majlan

et al. 2015

Journal of Industrial and Engineering Chemistry

250

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Effect of porosity on electrochemical properties of carbon materials as cathode for lithium-oxygen battery

Cited by 65 publications

References 18 publications

Cobalt-doped mesoporous carbon nanofibres as free-standing cathodes for lithium–oxygen batteries

Cobalt-doped mesoporous carbon nanofibres as free-standing cathodes for lithium–oxygen batteries

Recent advances in electrospun carbon nanofibers and their application in electrochemical energy storage

Recent developments in materials for aluminum–air batteries: A review

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