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Unraveling the storage mechanism in organic carbonyl electrodes for sodium-ion batteries.

Wu X, Jin S, Zhang Z, Jiang L, Mu L, Hu YS, Li H, Chen X, Armand M, Chen L, Huang X - Sci Adv (2015)

Bottom Line: We take Na2C6H2O4 as an example to unravel the mechanism.It consists of alternating Na-O octahedral inorganic layer and π-stacked benzene organic layer in spatial separation, delivering a high reversible capacity and first coulombic efficiency.The experiment and calculation results reveal that the Na-O inorganic layer provides both Na(+) ion transport pathway and storage site, whereas the benzene organic layer provides electron transport pathway and redox center.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

ABSTRACT
Organic carbonyl compounds represent a promising class of electrode materials for secondary batteries; however, the storage mechanism still remains unclear. We take Na2C6H2O4 as an example to unravel the mechanism. It consists of alternating Na-O octahedral inorganic layer and π-stacked benzene organic layer in spatial separation, delivering a high reversible capacity and first coulombic efficiency. The experiment and calculation results reveal that the Na-O inorganic layer provides both Na(+) ion transport pathway and storage site, whereas the benzene organic layer provides electron transport pathway and redox center. Our contribution provides a brand-new insight in understanding the storage mechanism in inorganic-organic layered host and opens up a new exciting direction for designing new materials for secondary batteries.

No MeSH data available.


Related in: MedlinePlus

Reaction mechanism.The different reaction paths in the first two cycles of the Na2C6H2O4 electrode.
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Figure 4: Reaction mechanism.The different reaction paths in the first two cycles of the Na2C6H2O4 electrode.

Mentions: In the second cycle, both discharge and charge processes are accomplished through two two-phase reactions (fig. S3). The intermediate-phase Na3C6H2O4 is formed in the first charge process and is then highly reversible in the subsequent cycles, as illustrated in Fig. 3 (C and D). It indicates that the first discharge mechanism is different than that of subsequent electrochemical processes, which may cause the first irreversible loss. From the first charge, the electrode reaction exhibits high structure reversibility and stability, thus ensuring long cycle life. The different reaction paths of the first two cycles are illustrated in Fig. 4.


Unraveling the storage mechanism in organic carbonyl electrodes for sodium-ion batteries.

Wu X, Jin S, Zhang Z, Jiang L, Mu L, Hu YS, Li H, Chen X, Armand M, Chen L, Huang X - Sci Adv (2015)

Reaction mechanism.The different reaction paths in the first two cycles of the Na2C6H2O4 electrode.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4643786&req=5

Figure 4: Reaction mechanism.The different reaction paths in the first two cycles of the Na2C6H2O4 electrode.
Mentions: In the second cycle, both discharge and charge processes are accomplished through two two-phase reactions (fig. S3). The intermediate-phase Na3C6H2O4 is formed in the first charge process and is then highly reversible in the subsequent cycles, as illustrated in Fig. 3 (C and D). It indicates that the first discharge mechanism is different than that of subsequent electrochemical processes, which may cause the first irreversible loss. From the first charge, the electrode reaction exhibits high structure reversibility and stability, thus ensuring long cycle life. The different reaction paths of the first two cycles are illustrated in Fig. 4.

Bottom Line: We take Na2C6H2O4 as an example to unravel the mechanism.It consists of alternating Na-O octahedral inorganic layer and π-stacked benzene organic layer in spatial separation, delivering a high reversible capacity and first coulombic efficiency.The experiment and calculation results reveal that the Na-O inorganic layer provides both Na(+) ion transport pathway and storage site, whereas the benzene organic layer provides electron transport pathway and redox center.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

ABSTRACT
Organic carbonyl compounds represent a promising class of electrode materials for secondary batteries; however, the storage mechanism still remains unclear. We take Na2C6H2O4 as an example to unravel the mechanism. It consists of alternating Na-O octahedral inorganic layer and π-stacked benzene organic layer in spatial separation, delivering a high reversible capacity and first coulombic efficiency. The experiment and calculation results reveal that the Na-O inorganic layer provides both Na(+) ion transport pathway and storage site, whereas the benzene organic layer provides electron transport pathway and redox center. Our contribution provides a brand-new insight in understanding the storage mechanism in inorganic-organic layered host and opens up a new exciting direction for designing new materials for secondary batteries.

No MeSH data available.


Related in: MedlinePlus