Nitride MXenes as sulfur hosts for thermodynamic and kinetic suppression of polysulfide shuttling: a computational study

2021 ◽  
Author(s):  
Ke Fan ◽  
Yiran Ying ◽  
Xin Luo ◽  
Haitao Huang
Keyword(s):  
Computational Study ◽  
Discharge Process ◽  
Practical Applications ◽  
The Poor ◽  
Sulfur Hosts ◽  
Lithium Sulfur ◽  
Charge Discharge

The practical applications of lithium-sulfur (Li–S) batteries are greatly hindered by the poor conductivity of sulfur, the shuttling of lithium polysulfides (LiPSs), and the sluggish kinetics in charge-discharge process. In...

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 Three-Dimensionally Ordered Macro/Mesoporous Nb2O5/Nb4N5 Heterostructure as Sulfur Host for High-Performance Lithium/Sulfur Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1531
Author(s):  
Haoxian Chen ◽  
Jiayi Wang ◽  
Yan Zhao ◽  
Qindan Zeng ◽  
Guofu Zhou ◽  
...  
Keyword(s):  
Mass Transfer ◽  
High Performance ◽  
Discharge Process ◽  
Transformation Mechanism ◽  
Shuttle Effect ◽  
Strong Adsorption ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Lithium Sulfur ◽  
Charge Discharge

The severe shuttle effect of soluble polysulfides hinders the development of lithium–sulfur batteries. Herein, we develop a three-dimensionally ordered macro/mesoporous (3DOM) Nb2O5/Nb4N5 heterostructure, which combines the strong adsorption of Nb2O5 and remarkable catalysis effect of Nb4N5 by the promotion “adsorption-transformation” mechanism in sulfur reaction. Furthermore, the high electrocatalytic activity of Nb4N5 facilitates ion/mass transfer during the charge/discharge process. As a result, cells with the S-Nb2O5/Nb4N5 electrode delivered outstanding cycling stability and higher discharge capacity than its counterparts. Our work demonstrates a new routine for the multifunctional sulfur host design, which offers great potential for commercial high-performance lithium–sulfur batteries.

Effects on the Carbon Matrix as Conductor in Sulfur Electrode for Lithium/Sulfur Battery

2006 ◽  
Vol 510-511 ◽  
pp. 1082-1085 ◽  
Author(s):  
Young Jin Choi ◽  
Sang Sik Jeong ◽  
Ki Won Kim ◽  
Hyo Jun Ahn ◽  
Jou Hyeon Ahn
Keyword(s):  
Active Material ◽  
Carbon Matrix ◽  
Discharge Process ◽  
Voltage Range ◽  
Lithium Sulfur Battery ◽  
Galvanostatic Method ◽  
Sulfur Battery ◽  
Sulfur Electrode ◽  
Lithium Sulfur ◽  
Charge Discharge

Lithium/sulfur battery has some problems such as low utilization of active material and poor cycle life owing to the dissolution of lithium polysulfide into electrolyte, aggregation of sulfur during charge-discharge process, and structural change of sulfur electrode. To overcome such problems, carbon nano tubes (CNTs) and graphitic nano fibers (GNFs) were added into the sulfur electrode. The addition of CNTs and GNFs having a network-like structure is expected to offer the structural stability and good electrical path of sulfur electrode. The morphology of fabricated sulfur electrode was observed by using scanning electron microscope (SEM), and the crystalline structure was characterized by using X-ray diffraction (XRD). The charge/discharge tests were conducted in the voltage range 3.2/1.5V (vs.Li) with a galvanostatic method.

Improving cyclic stability of polyaniline by thermal crosslinking as electrode material for supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (96) ◽  
pp. 78545-78552 ◽  
Author(s):  
Xue Wang ◽  
Dong Liu ◽  
Jinxing Deng ◽  
Xiaojuan Duan ◽  
Jinshan Guo ◽  
...  
Keyword(s):  
Electrode Material ◽  
Discharge Process ◽  
Cyclic Stability ◽  
Volume Changes ◽  
The Poor ◽  
Thermal Crosslinking ◽  
Charge Discharge

The poor cyclic stability of polyaniline restricts its application as an electrode material for supercapacitors, due to the volume changes during the long charge/discharge process.

Collaborative design of Li–S batteries using 3D N-doped graphene aerogel as a sulfur host and graphitic carbon nitride paper as an interlayer

2017 ◽  
Vol 1 (8) ◽  
pp. 1759-1765 ◽  
Author(s):  
Juthaporn Wutthiprom ◽  
Nutthaphon Phattharasupakun ◽  
Jakkrit Khuntilo ◽  
Thana Maihom ◽  
Jumras Limtrakul ◽  
...  
Keyword(s):  
Collaborative Design ◽  
Carbon Nitride ◽  
High Energy ◽  
Graphene Aerogel ◽  
Practical Applications ◽  
The Poor ◽  
Lithium Sulfur Batteries ◽  
Doped Graphene ◽  
Sulfur Host ◽  
Lithium Sulfur

Lithium–sulfur batteries (LSBs) have been widely investigated due to their high energy densities; however, their practical applications have still been limited by their poor cycling stability owing to the shuttle mechanism effect, volume expansion, soluble polysulfides, and the poor electrical conductivity of sulfur and Li2S.

Single atom catalysts supported on N-doped graphene toward fast kinetic Li−S batteries: a theoretical study

2021 ◽  
Author(s):  
Xu Han ◽  
Zeyun Zhang ◽  
Xuefei Xu
Keyword(s):  
Theoretical Study ◽  
Single Atom ◽  
Discharge Process ◽  
Fast Kinetics ◽  
Shuttle Effect ◽  
Sufficient Stability ◽  
Doped Graphene ◽  
Fast Kinetic ◽  
Kinetics Of ◽  
Charge Discharge

To suppress the shuttle effect of lithium polysulfides and promote fast kinetics of charge−discharge process in Li−S batteries, it is essential to search promising catalysts with sufficient stability and high...

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