scholarly journals Combined High Catalytic Activity and Efficient Polar Tubular Nanostructure in Urchin‐Like Metallic NiCo 2 Se 4 for High‐Performance Lithium–Sulfur Batteries

2019 ◽  
Vol 29 (34) ◽  
pp. 1903842 ◽  
Author(s):  
Chaoqi Zhang ◽  
Jordi Jacas Biendicho ◽  
Ting Zhang ◽  
Ruifeng Du ◽  
Junshan Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
High Catalytic Activity ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

Synthesis and Electrochemical Properties of MoS2/rGO/S Composite as a Cathode Material for Lithium–Sulfur Batteries

2020 ◽  
Vol 20 (11) ◽  
pp. 7087-7091
Author(s):  
Bhumi Reddy Srinivasulu Reddy ◽  
Mookala Premasudha ◽  
Yeon-Ju Lee ◽  
Hyo-Jun Ahn ◽  
Nagireddy Gari Subba Reddy ◽  
...  
Keyword(s):  
Cathode Material ◽  
High Performance ◽  
Reversible Capacity ◽  
Diffusion Method ◽  
High Catalytic Activity ◽  
Potential Candidate ◽  
Lithium Sulfur Batteries ◽  
Attractive Option ◽  
Fading Rate ◽  
Lithium Sulfur

To develop the next-generation energy storage systems, lithium-sulfur batteries represent an attractive option due to its high theoretical capacity, and energy density. In this work, MoS2/rGO (reduced graphene oxide) was prepared by hydrothermal synthesis and sulfur added by the melt diffusion method. The as-prepared MoS2/rGO has strong polysulfides entrapping, high conductivity, large surface area, and high catalytic activity, consequently resulting in enhanced rate performance and cycling capability of Li-S batteries. The coin cells were constructed with the MoS2/rGO/S cathode material, exhibit a high reversible capacity of nearly 1380 mAh/g at 0.1 C, outstanding cycling stability with a low capacity fading rate. Present work reveals that the hierarchal MoS2/rGO/S cathodes are potential candidate materials for future high-performance lithium-sulfur batteries.

scholarly journals A Novel Synthesizing Strategy of 3D Cose2 Porous Hollow Flowers for High Performance Lithium–Sulfur Batteries

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 273
Author(s):  
Wei Xu ◽  
Qikai Wu ◽  
Zhongmei Che ◽  
Bin Fan ◽  
Dengke Zhao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Catalytic Activity ◽  
High Performance ◽  
Specific Capacity ◽  
High Rate ◽  
High Catalytic Activity ◽  
Discharge Process ◽  
Double Hydroxide ◽  
Lithium Sulfur ◽  
Charge Discharge

Redox kinetics of lithium polysulfides (LiPSs) conversion and poor electrical conductivity of sulfur during the charge-discharge process greatly inhibit the commercialization of high-performance lithium–sulfur (Li–S) batteries. Herein, we synthesized CoSe2 porous hollow flowers (CoSe2-PHF) by etching and further selenizing layered double hydroxide, which combined the high catalytic activity of transition metal compound and high electrical conductivity of selenium. The obtained CoSe2-PHF can efficiently accelerate the catalytic conversion of LiPSs, expedite the electron transport, and improve utilization of active sulfur during the charge-discharge process. As a result, with CoSe2-PHF/S-based cathodes, the Li–S batteries exhibited a reversible specific capacity of 955.8 mAh g−1 at 0.1 C and 766.0 mAh g−1 at 0.5 C, along with a relatively small capacity decay rate of 0.070% per cycle within 400 cycles at 1 C. Even at the high rate of 3 C, the specific capacity of 542.9 mAh g−1can be maintained. This work enriches the way to prepare porous composites with high catalytic activity and electrical conductivity as sulfur hosts for high-rate, long-cycle rechargeable Li–S batteries.

scholarly journals High-Index Faceted Nanocrystals as Highly Efficient Bifunctional Electrocatalysts for High-Performance Lithium–Sulfur Batteries

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Bo Jiang ◽  
Da Tian ◽  
Yue Qiu ◽  
Xueqin Song ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
Cycling Performance ◽  
High Index ◽  
High Catalytic Activity ◽  
Crystal Facet ◽  
Highly Efficient ◽  
Bifunctional Electrocatalysts ◽  
New Strategy ◽  
Lithium Sulfur

AbstractPrecisely regulating of the surface structure of crystalline materials to improve their catalytic activity for lithium polysulfides is urgently needed for high-performance lithium–sulfur (Li–S) batteries. Herein, high-index faceted iron oxide (Fe2O3) nanocrystals anchored on reduced graphene oxide are developed as highly efficient bifunctional electrocatalysts, effectively improving the electrochemical performance of Li–S batteries. The theoretical and experimental results all indicate that high-index Fe2O3 crystal facets with abundant unsaturated coordinated Fe sites not only have strong adsorption capacity to anchor polysulfides but also have high catalytic activity to facilitate the redox transformation of polysulfides and reduce the decomposition energy barrier of Li2S. The Li–S batteries with these bifunctional electrocatalysts exhibit high initial capacity of 1521 mAh g−1 at 0.1 C and excellent cycling performance with a low capacity fading of 0.025% per cycle during 1600 cycles at 2 C. Even with a high sulfur loading of 9.41 mg cm−2, a remarkable areal capacity of 7.61 mAh cm−2 was maintained after 85 cycles. This work provides a new strategy to improve the catalytic activity of nanocrystals through the crystal facet engineering, deepening the comprehending of facet-dependent activity of catalysts in Li–S chemistry, affording a novel perspective for the design of advanced sulfur electrodes.

Dipolar and catalytic effects of an Fe3O4 based nitrogen-doped hollow carbon sphere framework for high performance lithium sulfur batteries

2021 ◽  
Author(s):  
Shungui Deng ◽  
Qihua Li ◽  
Yanhua Chen ◽  
Chao Wang ◽  
Hongbin Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
High Catalytic Activity ◽  
Carbon Sphere ◽  
Hollow Carbon Sphere ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Hollow Carbon ◽  
Catalytic Effects ◽  
Redox Conversion ◽  
Lithium Sulfur

Well-designed hollow carbon sphere with embedded Fe3O4 nanoparticles is fabricated as sulfur host for Li–S batteries. The high catalytic activity of Fe3O4 can accelerate the redox conversion of polysulfide, facilitating the reaction kinetics.

Sulfur vacancies in Co9S8-x/N-doped graphene enhancing electrochemical kinetics to high-performance lithium sulfur batteries

2021 ◽  
Author(s):  
Haojie Li ◽  
Yihua Song ◽  
Kai Xi ◽  
Wei Wang ◽  
Sheng Liu ◽  
...  
Keyword(s):  
Cathode Materials ◽  
High Performance ◽  
Catalytic Conversion ◽  
High Energy ◽  
Electrochemical Kinetics ◽  
Lithium Sulfur Batteries ◽  
Doped Graphene ◽  
Sulfur Battery ◽  
Areal Capacity ◽  
Lithium Sulfur

A sufficient areal capacity is necessary for achieving high-energy lithium sulfur battery, which requires high enough sulfur loading in cathode materials. Therefore, kinetically fast catalytic conversion of polysulfide intermediates is...

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