Li 2 O 2 oxidation: the charging reaction in the aprotic Li-O 2 batteries

Cui, Qinghua; Zhang, Yelong; Ma, Shunchao; Peng, Zhangquan

doi:10.1007/s11434-015-0837-5

Cited by 18 publications

(8 citation statements)

References 43 publications

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“…First, O 2 binds onto the active sites of the catalysts, followed by reduction to form O 2 – . Li + then bonded with O 2 – to form the intermediate product LiO 2 in the TEGDME-based electrolytes …”

Section: Resultsmentioning

confidence: 99%

Enhancing the Catalytic Activity of Co₃O₄ for Li–O₂ Batteries through the Synergy of Surface/Interface/Doping Engineering

et al. 2018

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Efficient bifunctional catalysts are highly desirable for Li–O2 batteries to accerlerate the oxygen reduction and oxygen evolution reactions. Surface/interface regulation or doping has been used to enhance the activity of the catalysts. Herein, we propose a facile synchronous reduction strategy to fabricate a yolk–shell Co3O4@Co3O4/Ag hybrid which integrates the advantages of surface, interface, and doping engineering as a highly active catalyst for Li-O2 batteries. The Co3O4@Co3O4/Ag-based cathode shows a high initial capacity (12000 mAh g–1@200 mA g–1), high rate capability (4700 mAh g–1@800 mA g–1), low overpotential, and long cycle life due to the synergetic interactions of surface, interface, and doping engineering. The underling synergetic mechanism has been uncovered by X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption near-edge structure spectra, aberration-corrected scanning transmission electron microscopy, electrochemical impedance spectra, and ex situ scanning electron microscopy. For Co3O4@Co3O4/Ag, part of Ag has formed on the surface of Co3O4 shell as single atoms or clusters and a fraction of Ag has been doped into the crystal lattice of Co3O4 at the same time, which not only strengthens the Ag–Co3O4 interface binding but also tailors the valence electronic structure of Ag and Co species as well as improves the electronic conductivity. This particular architecture provides more active sites for the ORR/OER and also enhances the catalytic activity. In addition, flowerlike Li2O2 forms on the Co3O4@Co3O4/Ag cathode, which is more feasible to decompose in comparison to toroidal-like Li2O2. This study offers some insights into designing efficient cathode catalysts through a synergetic surface/interface/doping engineering strategy.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Catalytic Activity of Co₃O₄ for Li–O₂ Batteries through the Synergy of Surface/Interface/Doping Engineering

et al. 2018

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“…Some authors attribute them to the formation of lithium superoxide and lithium peroxide, respectively [31], while others mention the formation of particles of different sizes, or thicknesses of the lithium peroxide layer [32]. The peaks could also be attributed to the formation of different structures of lithium peroxide, either in the crystalline or amorphous phase [33]. Among these, the amorphous phase is preferred, because it presents higher electrical conductivity, which is beneficial for the greater efficiency of the battery.…”

Section: Aeg As Cathode In Li-o 2 Batterymentioning

confidence: 99%

Synthesis and Characterization of Aero-Eutectic Graphite Obtained by Solidification and Its Application in Energy Storage: Cathodes for Lithium Oxygen Batteries

Gregorutti

Tesio²,

Gómez-Cámer

et al. 2020

Electronic Materials

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Aero-eutectic graphite can be defined as a new light material with hierarchically structured porosity. It is obtained from the solidification of gray cast irons, followed by the dissolution of the ferrous matrix by an acidic sequence. The result is a continuous and interconnected network of graphite sheets with varied dimensions randomly oriented. X-ray diffraction characterization has revealed graphite crystallographic planes (002), (100), (101), (102) and (004), while the surface area measured by BET and Langmuir methods has been determined in the order of 90 m2 g−1 and 336 m2 g−1, respectively. The process of obtaining eutectic aero-graphite also allows the deposit of Cu nanofilms and TiC particles. Aero-eutectic graphite has been tested as cathode in Li–O2 batteries as it has been prepared, without the addition of binders or conductive carbons, showing an appropriate contact with the electrolyte, so that the oxygen reduction and evolution reactions may develop satisfactorily. In the discharge-charge galvanostatic tests, the battery accomplishes 20 complete cycles with area capacity limited to 1.2 mAh cm−2.

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“…However, the sluggish kinetics of ORR/OER resulted from the insulated nature of lithium oxides, significantly increases the overpotential and lowers the round-trip efficiency. The high charging overpotential readily causes the oxidation and decomposition of electrolyte, which leads to the formation and accumulation of insoluble side products, and thus blocks the oxygen diffusion channels and result in the death of cells [33]. Great efforts have been made to develop an appropriate cathode that can reduce the overpotential during discharging and charging and enhance the electrochemical performance.…”

Section: Sluggish Kinetics Of Oxygen Reaction and Rapid Deteriorationmentioning

confidence: 99%

Recent developments of aprotic lithium-oxygen batteries: functional materials determine the electrochemical performance

Guo

Sun

et al. 2017

Science Bulletin

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Li 2 O 2 oxidation: the charging reaction in the aprotic Li-O 2 batteries

Cited by 18 publications

References 43 publications

Enhancing the Catalytic Activity of Co₃O₄ for Li–O₂ Batteries through the Synergy of Surface/Interface/Doping Engineering

Enhancing the Catalytic Activity of Co₃O₄ for Li–O₂ Batteries through the Synergy of Surface/Interface/Doping Engineering

Synthesis and Characterization of Aero-Eutectic Graphite Obtained by Solidification and Its Application in Energy Storage: Cathodes for Lithium Oxygen Batteries

Recent developments of aprotic lithium-oxygen batteries: functional materials determine the electrochemical performance

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Li 2 O 2 oxidation: the charging reaction in the aprotic Li-O 2 batteries

Cited by 18 publications

References 43 publications

Enhancing the Catalytic Activity of Co3O4 for Li–O2 Batteries through the Synergy of Surface/Interface/Doping Engineering

Enhancing the Catalytic Activity of Co3O4 for Li–O2 Batteries through the Synergy of Surface/Interface/Doping Engineering

Synthesis and Characterization of Aero-Eutectic Graphite Obtained by Solidification and Its Application in Energy Storage: Cathodes for Lithium Oxygen Batteries

Recent developments of aprotic lithium-oxygen batteries: functional materials determine the electrochemical performance

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Enhancing the Catalytic Activity of Co₃O₄ for Li–O₂ Batteries through the Synergy of Surface/Interface/Doping Engineering

Enhancing the Catalytic Activity of Co₃O₄ for Li–O₂ Batteries through the Synergy of Surface/Interface/Doping Engineering