Physical and chemical dual-confinement of polysulfides within hierarchically meso-microporous nitrogen-doped carbon nanocages for advanced Li-S batteries

Pan Wu, Ming Hui Sun, Yong Yu, Zhao Peng, Shimeles T. Bulbula, Yu Li, Li Hua Chen, Bao Lian Su

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Lithium-sulfur (Li-S) batteries with high theoretical specific energy (1675 mA h g-1), environmental benignity and low cost are considered to be some of the most promising next-generation energy-storage systems compared with conventional lithium-ion batteries. However intrinsic large volume expansion and irreversible loss of activated materials seriously limit their commercial applications. To solve the problems, nitrogen-doped hierarchical carbon nanocages were synthesized and used as efficient sulfur hosts. The synthesized nitrogen doped hierarchically meso-microporous carbon (N-MMC) had large BET surface area and mesopore volumes, contributing to high sulfur loading and a reduced volume-change effect of sulfur during lithiation. Moreover, the strong physical adsorption in the micropores together with improved chemical adsorption caused by nitrogen doping lead to effective polysulfide trapping. The N-MMC/S exhibited high initial capacities of 1202.2 mA h g-1 at 0.2C and 1024 mA h g-1 at 0.5C. The capacity kept at as high as 780 mA h g-1 after 60 cycles at 0.2C and 623.8 mA h g-1 after 70 cycles at 0.5C.

langueAnglais
Pages42627-42633
Nombre de pages7
journalRSC Advances
Volume7
Numéro68
Les DOIs
étatPublié - 2017

Empreinte digitale

Polysulfides
Nitrogen
Carbon
Lithium sulfur batteries
polysulfide
Sulfur
Adsorption
Energy storage
Doping (additives)
Costs
Lithium-ion batteries

Citer ceci

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title = "Physical and chemical dual-confinement of polysulfides within hierarchically meso-microporous nitrogen-doped carbon nanocages for advanced Li-S batteries",
abstract = "Lithium-sulfur (Li-S) batteries with high theoretical specific energy (1675 mA h g-1), environmental benignity and low cost are considered to be some of the most promising next-generation energy-storage systems compared with conventional lithium-ion batteries. However intrinsic large volume expansion and irreversible loss of activated materials seriously limit their commercial applications. To solve the problems, nitrogen-doped hierarchical carbon nanocages were synthesized and used as efficient sulfur hosts. The synthesized nitrogen doped hierarchically meso-microporous carbon (N-MMC) had large BET surface area and mesopore volumes, contributing to high sulfur loading and a reduced volume-change effect of sulfur during lithiation. Moreover, the strong physical adsorption in the micropores together with improved chemical adsorption caused by nitrogen doping lead to effective polysulfide trapping. The N-MMC/S exhibited high initial capacities of 1202.2 mA h g-1 at 0.2C and 1024 mA h g-1 at 0.5C. The capacity kept at as high as 780 mA h g-1 after 60 cycles at 0.2C and 623.8 mA h g-1 after 70 cycles at 0.5C.",
author = "Pan Wu and Sun, {Ming Hui} and Yong Yu and Zhao Peng and Bulbula, {Shimeles T.} and Yu Li and Chen, {Li Hua} and Su, {Bao Lian}",
year = "2017",
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journal = "RSC Advances",
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Physical and chemical dual-confinement of polysulfides within hierarchically meso-microporous nitrogen-doped carbon nanocages for advanced Li-S batteries. / Wu, Pan; Sun, Ming Hui; Yu, Yong; Peng, Zhao; Bulbula, Shimeles T.; Li, Yu; Chen, Li Hua; Su, Bao Lian.

Dans: RSC Advances, Vol 7, Numéro 68, 2017, p. 42627-42633.

Résultats de recherche: Contribution à un journal/une revueArticle

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AU - Wu,Pan

AU - Sun,Ming Hui

AU - Yu,Yong

AU - Peng,Zhao

AU - Bulbula,Shimeles T.

AU - Li,Yu

AU - Chen,Li Hua

AU - Su,Bao Lian

PY - 2017

Y1 - 2017

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