scholarly journals Nanoporosity of Carbon–Sulfur Nanocomposites toward the Lithium–Sulfur Battery Electrochemistry

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1518
Author(s):  
Chien-Hsun Yu ◽  
Yin-Ju Yen ◽  
Sheng-Heng Chung
Keyword(s):  
Rate Capability ◽  
High Energy ◽  
Microporous Carbon ◽  
High Energy Density ◽  
High Loading ◽  
Electrochemical Performances ◽  
Electrochemical Characteristics ◽  
Sulfur Cathode ◽  
Composite Cathodes ◽  
Lithium Sulfur

An ideal high-loading carbon–sulfur nanocomposite would enable high-energy-density lithium–sulfur batteries to show high electrochemical utilization, stability, and rate capability. Therefore, in this paper, we investigate the effects of the nanoporosity of various porous conductive carbon substrates (e.g., nonporous, microporous, micro/mesoporous, and macroporous carbons) on the electrochemical characteristics and cell performances of the resulting high-loading carbon–sulfur composite cathodes. The comparison analysis of this work demonstrates the importance of having high microporosity in the sulfur cathode substrate. The high-loading microporous carbon–sulfur cathode attains a high sulfur loading of 4 mg cm−2 and sulfur content of 80 wt% at a low electrolyte-to-sulfur ratio of 10 µL mg−1. The lithium–sulfur cell with the microporous carbon–sulfur cathode demonstrates excellent electrochemical performances, attaining a high discharge capacity approaching 1100 mA∙h g−1, a high-capacity retention of 75% after 100 cycles, and superior high-rate capability of C/20–C/3 with excellent reversibility.

Fast Polysulfides Catalytic Conversion and Self-Repairing Ability for High Loading Lithium-Sulfur Batteries using a Permselective Coating Layer Modified Separator

Nanoscale ◽  
2021 ◽  
Author(s):  
Fanglei Zeng ◽  
Fang Wang ◽  
Ning Li ◽  
Ke Meng Song ◽  
Shi-Ye Chang ◽  
...  
Keyword(s):  
Energy Density ◽  
Coating Layer ◽  
High Energy ◽  
High Energy Density ◽  
High Loading ◽  
Battery System ◽  
Shuttle Effect ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur ◽  
Modified Separator

Li-S battery is considered as one of the most promising battery system because of its large theoretical capacity and high energy density. However, the “shuttle effect” of soluble polysulfides and...

Stringed “tube on cube” nanohybrids as compact cathode matrix for high-loading and lean-electrolyte lithium–sulfur batteries

2018 ◽  
Vol 11 (9) ◽  
pp. 2372-2381 ◽  
Author(s):  
Gaoran Li ◽  
Wen Lei ◽  
Dan Luo ◽  
Yaping Deng ◽  
Zhiping Deng ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
High Loading ◽  
Hybrid Architecture ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur ◽  
High Sulfur Loading

Stringed “tube on cube” hybrid architecture is developed for high-energy-density lithium–sulfur batteries with high sulfur loading and lean electrolyte.

Self‐Supported and Flexible Sulfur Cathode Enabled via Synergistic Confinement for High‐Energy‐Density Lithium–Sulfur Batteries

2019 ◽  
Vol 31 (33) ◽  
pp. 1902228 ◽  
Author(s):  
Zhuosen Wang ◽  
Jiadong Shen ◽  
Jun Liu ◽  
Xijun Xu ◽  
Zhengbo Liu ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Sulfur Cathode ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

Graphene oxide-polypyrrole composite as sulfur hosts for high-performance lithium-sulfur batteries

2018 ◽  
Vol 11 (06) ◽  
pp. 1840007 ◽  
Author(s):  
Qian Wang ◽  
Chengkai Yang ◽  
Hui Tang ◽  
Kai Wu ◽  
Henghui Zhou
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Density Functional ◽  
Specific Capacity ◽  
High Energy ◽  
High Energy Density ◽  
Composite Cathodes ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur ◽  
Capacity Decay

Lithium-sulfur batteries are considered as a promising candidate for the next-generation high energy density storage devices. However, they are still hindered by serious capacity decay on cycling caused by the dissolution of redox intermediates. Here, we designed a unique structure with polypyrrole (ppy) inserting into the graphene oxide (GO) sheet for accommodating sulfur. Such a sulfur host not only exhibits a good electronic and ionic conductivity, but also can suppress polysulfide dissolution effectively. With this advanced design, the composite cathode showed a high specific capacity of 548.4[Formula: see text]mA[Formula: see text]h[Formula: see text]g[Formula: see text] at 5.0 C. A stable Coulombic efficiency of [Formula: see text]99.5% and a capacity decay rate as low as 0.089% per cycle along with 300 cycles at 1.0 C were achieved for composite cathodes with 78[Formula: see text]wt.% of S. Besides, the interaction mechanism between PPy and lithium polysulfides (LPS) was investigated by density-functional theory (DFT), suggesting that only the polymerization of N atoms can bind strongly to Li ions of LPS rather than single N atoms. The 3D structure GO-PPy host with high conductivity and excellent trapping ability to LPS offered a viable strategy to design high-performance cathodes for Li–S batteries.

scholarly journals Biomass based porous carbon for supercapacitor by hydrothermal assisted activating method

2021 ◽  
Vol 236 ◽  
pp. 01016
Author(s):  
Congcong Huang ◽  
Yunhui Dong ◽  
Xingjun Dong
Keyword(s):  
Electrode Material ◽  
High Performance ◽  
Activated Carbons ◽  
High Capacity ◽  
Rate Capability ◽  
High Energy ◽  
High Energy Density ◽  
Koh Activation ◽  
Electrochemical Performances ◽  
Adsorption Desorption

A facile route has been employed to synthesize a series of high performance activated carbons as the electrode material for supercapacitors. The structure of the carbons are characterized by N2 adsorption/desorption and FTIR spectroscopy. The electrochemical performances of the carbons as an electrode material were evaluated by cyclic voltammetry test and galvanostatic charge/discharge measurements. As a biomass derived carbon, KOH-1 exhibits high capacity, good rate capability and high energy density, indicating the promising application of hydrothermal combining with KOH activation method for biomass materials that used in supercapacitors

Effect of the Layer Height on the Electrochemical Properties of Lithium-Sulfur Cell

2021 ◽  
Vol 105 (1) ◽  
pp. 177-182
Author(s):  
Kamil Jasso ◽  
Tomas Kazda ◽  
Pavel Cudek ◽  
Dominika Capkova
Keyword(s):  
Energy Density ◽  
Active Material ◽  
Rate Capability ◽  
High Energy ◽  
Cell Polarization ◽  
High Energy Density ◽  
Negative Consequences ◽  
Layer Height ◽  
Material Layer ◽  
Lithium Sulfur

One of the possible ways of manufacturing high-energy density lithium-sulfur batteries is to increase the height of the active material layer and thus increase the thickness of the electrode. The energy density frequently rises in tandem with the height of the active material layer; however, increased electrode thickness might result in a variety of negative consequences such as increased internal resistance of the cell, increased cell polarization, decreased porosity, or insufficient ion diffusion. The effect of the layer height of the positive electrode on the rate capability, energy density, and cycling behavior of the lithium-sulfur cells will be analyzed in this article.

scholarly journals TiO2/GO-coated functional separator to suppress polysulfide migration in lithium–sulfur batteries

2019 ◽  
Vol 10 ◽  
pp. 1726-1736 ◽  
Author(s):  
Ning Liu ◽  
Lu Wang ◽  
Taizhe Tan ◽  
Yan Zhao ◽  
Yongguang Zhang
Keyword(s):  
Rate Capability ◽  
High Energy ◽  
High Energy Density ◽  
Cyclic Performance ◽  
Chemical Absorption ◽  
Lithium Sulfur Batteries ◽  
Excellent Adhesion ◽  
Coated Separator ◽  
Enhanced Conductivity ◽  
Lithium Sulfur

Lithium–sulfur batteries render a high energy density but suffer from poor cyclic performance due to the dissolution of intermediate polysulfides. Herein, a lightweight nanoporous TiO2 and graphene oxide (GO) composite is prepared and utilized as an interlayer between a Li anode and a sulfur cathode to suppress the polysulfide migration and improve the electrochemical performance of Li/S batteries. The interlayer can capture the polysulfides due to the presence of oxygen functional groups and formation of chemical bonds. The hierarchically porous TiO2 nanoparticles are tightly wrapped in GO sheets and facilitate the polysulfide storage and chemical absorption. The excellent adhesion between TiO2 nanoparticles and GO sheets resulted in enhanced conductivity, which is highly desirable for an efficient electron transfer process. The Li/S battery with a TiO2/GO-coated separator exhibited a high initial discharge capacity of 1102.8 mAh g−1 and a 100th cycle capacity of 843.4 mAh g−1, which corresponds to a capacity retention of 76.48% at a current rate of 0.2 C. Moreover, the Li/S battery with the TiO2/GO-coated separator showed superior cyclic performance and excellent rate capability, which shows the promise of the TiO2/GO composite in next-generation Li/S batteries.

Mechanistic Understanding of Metal Phosphide Host for Sulfur Cathode in High-Energy-Density Lithium–Sulfur Batteries

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 8986-8996 ◽  
Author(s):  
Jiadong Shen ◽  
Xijun Xu ◽  
Jun Liu ◽  
Zhengbo Liu ◽  
Fangkun Li ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Sulfur Cathode ◽  
Metal Phosphide ◽  
Lithium Sulfur Batteries ◽  
Mechanistic Understanding ◽  
Lithium Sulfur
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