Hierarchically porous nitrogen-doped carbon as cathode for lithium–sulfur batteries

Wu, Rui; Chen, Siguo; Deng, Jianghai; Huang, Xun; Song, Yujie; Gan, Ruiyi; Wan, Xiaoju; Wei, Zidong

doi:10.1016/j.jechem.2018.02.010

Cited by 83 publications

(41 citation statements)

References 48 publications

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“…Powering the rapid LiPS conversion is critically important to realize high‐capacity, fast‐charge, and long‐term Li–S batteries. Based on these considerations, various electrocatalysts are applied in a working Li–S battery . However, most of them suffer from low surface‐to‐volume ratio, considerably sacrificing the electrocatalytic activities.…”

Section: Introductionmentioning

confidence: 99%

“…Based on these considerations, various electrocatalysts are applied in a working Li-S battery. [78][79][80][81][82][83][84] However, most of them suffer from low surface-to-volume ratio, considerably sacrificing the electrocatalytic activities. Atomic-scale electrocatalysts are preferred in this respect, as they take advantages of atomic efficiency of electrocatalysts to modulate the LiPS electrochemical behaviors.…”

Section: Introductionmentioning

confidence: 99%

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Expediting redox kinetics of sulfur species by atomic‐scale electrocatalysts in lithium–sulfur batteries

Kong

Chang-xin

et al. 2019

InfoMat

282

170

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Lithium–sulfur (Li–S) batteries have extremely high theoretical energy density that make them as promising systems toward vast practical applications. Expediting redox kinetics of sulfur species is a decisive task to break the kinetic limitation of insulating lithium sulfide/disulfide precipitation/dissolution. Herein, we proposed a porphyrin‐derived atomic electrocatalyst to exert atomic‐efficient electrocatalytic effects on polysulfide intermediates. Quantifying electrocatalytic efficiency of liquid/solid conversion through a potentiostatic intermittent titration technique measurement presents a kinetic understanding of specific phase evolutions imparted by the atomic electrocatalyst. Benefiting from atomically dispersed “lithiophilic” and “sulfiphilic” sites on conductive substrates, the finely designed atomic electrocatalyst endows Li–S cells with remarkable cycling stablity (cyclic decay rate of 0.10% in 300 cycles), excellent rate capability (1035 mAh g−1 at 2 C), and impressive areal capacity (10.9 mAh cm−2 at a sulfur loading of 11.3 mg cm−2). The present work expands atomic electrocatalysts to the Li–S chemistry, deepens kinetic understanding of sulfur species evolution, and encourages application of emerging electrocatalysis in other multielectron/multiphase reaction energy systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Expediting redox kinetics of sulfur species by atomic‐scale electrocatalysts in lithium–sulfur batteries

Kong

Chang-xin

et al. 2019

InfoMat

282

170

View full text Add to dashboard Cite

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“…However, the poor conductivity of NiCo 2 O 4 limits the electrocatalytic properties to a certain extent. Transition metal selenides (M x Se, M = Co, Ni and Fe) exhibit better electrocatalytic performance owing to their metal conductive features when compared with the oxides and sulfides [24][25][26][27][28] http://engine.scichina.com/doi/10.1016/j.jechem.2019.01.001 active sites exposed by electrocatalysts is important; this is adequately achieved by the porous structure [29][30][31] .…”

Section: Introductionmentioning

confidence: 99%

Rechargeable Zn-air batteries initiated by nickel–cobalt bimetallic selenide

Sun

Guo

Zhang

et al. 2019

Journal of Energy Chemistry

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“…B). It means fast reaction kinetics (Wu et al ., ), which is attributed to its much stable SEI film and excellent sheet‐crossing structure (Wang et al ., ). As for other samples, large impedance value rises from the continuous broken and reorganisation of SEI film.…”

Section: Resultsmentioning

confidence: 97%

Architecting hierarchical shell porosity of hollow prussian blue‐derived iron oxide for enhanced Li storage

Zhao

Chen

LIU

et al. 2019

Journal of Microscopy

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Summary Delicate architecture of active material enables improving the performacne of lithium ion batteries. Environmental‐friendly Fe2O3 anode has high theoretical specific capacity (1007 mAh g−1) in lithium ion batteries, but suffers from structural collapsing and poor electronic conductivity. Herein, we design an unique hierarchical iron oxide by regulating the initial precursor prussian blue and targeting hollow‐shell structures with full consideration of temperature controls. Among them, Fe2O3 with a sheet‐crossing structure at 650°C, affords obvious advantages of improved electronic conductivity, short ionic diffusion length, prevented particle agglomeration, and buffer volume change. Thus, we achieve a superior discharge specific capacity of 611 mAh g−1 at 500 mA g−1. Regulating hierarchical structure of prussian blue‐assisted oxides enables effectively enchancing Li storge performance. Lay Description Nanoparticle self‐assembly, one of bottom‐up methods is often used to prepare hollow hierarchical structures, whereas it suffers from low productivity and insufficient stability. Hence, we designed a unique hierarchical iron oxide by top‐down method with regulating the initial precursor PB and targeting hollow‐shell structures through full consideration of temperature controls. Delicate architecture of active material enables improving the performacne of lithium ion batteries. Environmental‐friendly Fe2O3 anode has high theoretical specific capacity (1007 mAh g−1) in lithium ion batteries, but suffers from structural collapsing and poor electronic conductivity. Hence, we prepared Prussian Blue (PB) materials with different sizes and calcined them at different temperatures. We found that no matter what the size of PB, the sheet‐crossing morphology appeared at 650°C, and the interlaced morphology was the key to improve the performance of lithium batteries. If the size of PB precursor is too large or too small, it has adverse effects on lithium batteries. Only when the size and calcination temperature of PB precursor reach the optimum state, the best performance can be obtained. The calcination PB‐K‐3 at 650°C has a unique hierarchical structure of sheet‐crossing. An obvious advantages include the prevention of particle agglomeration, short ionic diffusion lengths, and buffering volume changes. As a consequence, 611 mAh g−1 was obtained at the current density of 500 mA g–1. In addition, we observed the structural changes of electrode plates at different reaction potentials, according to the reaction equation of Fe2O3+xLi++xe→LixFe2O3. With the proceeding charge process, the voltage increases from 0.01 to 3 V, the lithium ions gradually comes out of the iron oxide electrode surface. Whereas the discharging process reverses the aforementioned phenomena. Even if the changing volumes, however, the shape of cubic blocks for the PB‐K‐3 is preserved at different potentials. Taking these advantages into account, our designed MOFs‐derived struture was an effective way to prepare hollow hierarchical structure with enhanc...

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Hierarchically porous nitrogen-doped carbon as cathode for lithium–sulfur batteries

Cited by 83 publications

References 48 publications

Expediting redox kinetics of sulfur species by atomic‐scale electrocatalysts in lithium–sulfur batteries

Expediting redox kinetics of sulfur species by atomic‐scale electrocatalysts in lithium–sulfur batteries

Rechargeable Zn-air batteries initiated by nickel–cobalt bimetallic selenide

Architecting hierarchical shell porosity of hollow prussian blue‐derived iron oxide for enhanced Li storage

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