Tunable hierarchical porous carbon aerogel / graphene composites cathode matrix for Li-S batteries

Yan, Yinglin; Shi, Mangmang; Zou, Yiming; Wei, Yiqi; Chen, Liping; Fan, Chaojiang; Yang, Rong; Xu, Yunhua

doi:10.1016/j.jallcom.2019.03.396

Cited by 19 publications

(8 citation statements)

References 41 publications

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“…However, the microstructural collapse and shrinkage of CA during carbonization lead to the disappear of mesopores and macropores. Therefore, the micropores is dominant in CAs [ 14 ]. In the system of hydrochloric acid, the added PEG2000 acts as a soft template and structure-directing agent in the reaction [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is a kind of porous amorphous carbon nano-material with a 3D interconnected structure, high porosity (>80%), large specific surface area (usually 400~1100 m 2 ·g −1 before activation) and a particle diameter of around 3~20 nm [ 2 ]. CA is unique among other aerogels because of its electrical conductivity, corrosion resistance and chemical stability [ 3 , 4 ], and has broad prospects in water purification [ 5 , 6 ], drug delivery system [ 7 ], heat insulation [ 8 ], super capacitor [ 9 , 10 , 11 ], carrier for catalyst [ 12 , 13 ], batteries [ 14 ] and other fields [ 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Construction and Transition Metal Oxide Loading of Hierarchically Porous Carbon Aerogels

et al. 2020

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Hierarchically porous carbon aerogels (CAs) were prepared by organic condensation gelation method combined with atmospheric drying and pore-formation technology, followed by a carbonization process. With as-prepared CAs as substrate, the transition metal oxide nanoparticles loaded CAs composites (MnO2/Mn2O3@CA and Ni/NiO@CA) were achieved by means of liquid etching method combined with heat treatment, respectively. The catalyst, pore-forming agent and etching have important roles on the apparent density and pore structure of CAs. The hydrochloric acid (catalyst) significantly accelerates the gelation process and influences the size and distribution of macropores, whereas the addition of PEG2000 (pore-forming agent) and the etching of liquid solution leads to the formation of mesopore structure in CAs. Appropriate amounts of hydrochloric acid and PEG2000 allow the formation of hierarchically porous CAs with a BET surface area of 482.9 m2·g−1 and a macropore size of 11.3 μm. After etching and loading, the framework of CAs is etched to become a mesoporous structure, and the transition metal oxide nanoparticles can be uniformly loaded in CAs. These resultant composites have promising application in super capacitor, electrocatalysis, batteries and other fields.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Construction and Transition Metal Oxide Loading of Hierarchically Porous Carbon Aerogels

et al. 2020

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“…This result is in agreement with the CV analysis. In Figure 6b, the low potential of around 1.8 V corresponds to the conversion from Li 2 S 2 to Li 2 S [44]. With the increase of the current rate, the voltage of the discharge plateau is more negative and the voltage of the charge flat is more positive, indicating greater polarization.…”

Section: Resultsmentioning

confidence: 99%

Encapsulation of Few-Layer MoS2 in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries

Zhao

Zhuang

et al. 2019

Nanomaterials

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Integrating a highly conductive carbon host and polar inorganic compounds has been widely reported to improve the electrochemical performances for promising low-cost lithium sulfur batteries. Herein, a MoS2/mesoporous carbon hollow sphere (MoS2/MCHS) structure has been proposed as an efficient sulfur cathode via a simple wet impregnation method and gas phase vulcanization method. Multi-fold structural merits have been demonstrated for the MoS2/MCHS structures. On one hand, the mesoporous carbon hollow sphere (MCHS) matrix, with abundant pore structures and high specific surface areas, could load a large amount of sulfur, improve the electronical conductivity of sulfur electrodes, and suppress the volume changes during the repeated sulfur conversion processes. On the other hand, ultrathin multi-layer MoS2 nanosheets are revealed to be uniformly distributed in the mesoporous carbon hollow spheres, enhancing the physical adsorption and chemical entrapment functionalities towards the soluble polysulfide species. Having benefited from these structural advantages, the sulfur-impregnated MoS2/MCHS cathode presents remarkably improved electrochemical performances in terms of lower voltage polarization, higher reversible capacity (1094.3 mAh g−1), higher rate capability (590.2 mAh g−1 at 2 C), and better cycling stability (556 mAh g−1 after 400 cycles at 2 C) compared to the sulfur-impregnated MCHS cathode. This work offers a novel delicate design strategy for functional materials to achieve high performance lithium sulfur batteries.

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“…The high-frequency region can be ascribed to the accumulated passivation layer on the cathode surface, which is attributed to the formation of solid products (Li2S2/Li2S) in the electrode. The semicircle in the medium-frequency region is associated with charge transfer resistance at the electrode-electrolyte interface [51,60]. Moreover, the low-frequency region shows an inclined line that is assigned to the Li-ion diffusion resistance [61].…”

Section: Electrochemical Propertiesmentioning

confidence: 97%

“…Moreover, the cycling performance of the PC/S is comparable to those of the mesoporous carbon microtube/S [47], tubular amorphous C@S composite [48] and C@PC/S composite etc. [49][50][51][52][53] that are listed in Table S1. Despite that the corresponding literatures has reported a significant progress, the satisfactory electrochemical capabilities of PC/S cathode may ascribe to the following advantageous properties.…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Sucrose derived microporous–mesoporous carbon for advanced lithium–sulfur batteries

Wang

Hong

Liu

et al. 2021

Ceramics International

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Tunable hierarchical porous carbon aerogel / graphene composites cathode matrix for Li-S batteries

Cited by 19 publications

References 41 publications

Construction and Transition Metal Oxide Loading of Hierarchically Porous Carbon Aerogels

Construction and Transition Metal Oxide Loading of Hierarchically Porous Carbon Aerogels

Encapsulation of Few-Layer MoS2 in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries

Sucrose derived microporous–mesoporous carbon for advanced lithium–sulfur batteries

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