Hard Carbon Nanosheets with Uniform Ultramicropores and Accessible Functional Groups Showing High Realistic Capacity and Superior Rate Performance for Sodium-Ion Storage

Hard Carbon Nanosheets with Uniform Ultramicropores and Accessible Functional Groups Showing High Realistic Capacity and Superior Rate Performance for Sodium-Ion Storage

© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 32(2020), 21 vom: 26. Mai, Seite e2000447
1. Verfasser: Xia, Ji-Li (VerfasserIn)
Weitere Verfasser: Yan, Dong, Guo, Li-Ping, Dong, Xiao-Ling, Li, Wen-Cui, Lu, An-Hui
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article anode dual potential plateaus hard carbon sodium-ion batteries ultramicropores
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520 |a Hard carbon attracts considerable attention as an anode material for sodium-ion batteries; however, their poor rate capability and low realistic capacity have motivated intense research effort toward exploiting nanostructured carbons in order to boost their comprehensive performance. Ultramicropores are considered essential for attaining high-rate capacity as well as initial Coulombic efficiency by allowing the rapid diffusion of Na+ and inhibiting the contact of the electrolyte with the inner carbon surfaces. Herein, hard carbon nanosheets with centralized ultramicropores (≈0.5 nm) and easily accessible carbonyl groups (CO)/hydroxy groups (OH) are synthesized via interfacial assembly and carbonization strategies, delivering a large capacity (318 mA h g-1 at 0.02 A g-1 ), superior rate capability (145 mA h g-1 at 5.00 A g-1 ), and approximately 95% of reversible capacity below 1.00 V. Notably, a new charge model favoring fast capacitive sodium storage with dual potential plateaus is proposed. That is, the deintercalation of Na+ from graphitic layers is manifested as the low-potential plateau region (0.01-0.10 V), contributing to stable insertion capacity; meanwhile, the surface desodiation process of the CO and OH groups corresponds to the high-potential plateau region (0.40-0.70 V), contributing to a fast capacitive storage 
650 4 |a Journal Article 
650 4 |a anode 
650 4 |a dual potential plateaus 
650 4 |a hard carbon 
650 4 |a sodium-ion batteries 
650 4 |a ultramicropores 
700 1 |a Yan, Dong  |e verfasserin  |4 aut 
700 1 |a Guo, Li-Ping  |e verfasserin  |4 aut 
700 1 |a Dong, Xiao-Ling  |e verfasserin  |4 aut 
700 1 |a Li, Wen-Cui  |e verfasserin  |4 aut 
700 1 |a Lu, An-Hui  |e verfasserin  |4 aut 
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773 1 8 |g volume:32  |g year:2020  |g number:21  |g day:26  |g month:05  |g pages:e2000447 
856 4 0 |u http://dx.doi.org/10.1002/adma.202000447  |3 Volltext 
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