scholarly journals A Mo5N6 electrocatalyst for efficient Na2S electrodeposition in room-temperature sodium-sulfur batteries

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chao Ye ◽  
Huanyu Jin ◽  
Jieqiong Shan ◽  
Yan Jiao ◽  
Huan Li ◽  
...  
Keyword(s):  
Discharge Capacity ◽  
Density Functional ◽  
Room Temperature ◽  
Coulombic Efficiency ◽  
Cycling Performance ◽  
Electrochemical Kinetics ◽  
Metal Sulfides ◽  
Shuttle Effect ◽  
Band Position ◽  
Sodium Sulfur

AbstractMetal sulfides electrodeposition in sulfur cathodes mitigates the shuttle effect of polysulfides to achieve high Coulombic efficiency in secondary metal-sulfur batteries. However, fundamental understanding of metal sulfides electrodeposition and kinetics mechanism remains limited. Here using room-temperature sodium-sulfur cells as a model system, we report a Mo5N6 cathode material that enables efficient Na2S electrodeposition to achieve an initial discharge capacity of 512 mAh g−1 at a specific current of 1 675 mA g−1, and a final discharge capacity of 186 mAh g−1 after 10,000 cycles. Combined analyses from synchrotron-based spectroscopic characterizations, electrochemical kinetics measurements and density functional theory computations confirm that the high d-band position results in a low Na2S2 dissociation free energy for Mo5N6. This promotes Na2S electrodeposition, and thereby favours long-term cell cycling performance.

Combined enhanced redox kinetics and physiochemical confinement in three-dimensionally ordered macro/mesoporous TiN for highly stable lithium-sulfur batteries

2021 ◽  
Author(s):  
Jiabing Liu ◽  
Chenchen Hu ◽  
Wanjie Gao ◽  
Haipeng Li ◽  
Yan Zhao
Keyword(s):  
Discharge Capacity ◽  
Active Sites ◽  
Surface Region ◽  
Cycling Performance ◽  
Great Promise ◽  
Energy Storage Devices ◽  
Shuttle Effect ◽  
Practical Applications ◽  
Redox Kinetics ◽  
Lithium Sulfur

Abstract Lithium-sulfur (Li-S) batteries with tremendous energy density possess great promise for the next-generation energy storage devices. Even though, the shuttle effect and sluggish redox kinetics of lithium polysulfides (LiPSs) seriously restrict practical applications of Li-S batteries. Herein, a three-dimensionally ordered macro/mesoporous TiN (3DOM TiN) nanostructure is established via using poly (methyl methacrylate) PMMA spheres as template. The interconnected macro/mesoporous channels are constructed to effectively alleviate the stacking of composite materials and render a large portion of inherent active sites exposed on the surface region. Moreover, TiN exhibits high electrical conductivity, which efficiently enhances charge transfer kinetics and guarantees the favorable electrochemical performance of sulfur cathode. More importantly, the as-prepared 3DOM TiN suppresses the shuttle effect and improves the redox kinetics significantly due to strong affinity toward LiPSs. Attributed to these unique features, the S/3DOM TiN electrode achieves an ultrahigh initial discharge capacity of 1187 mAh g-1 at 0.2 C, and stable cycling performance of 552 mAh g-1 over 500 cycles at 1 C. Meanwhile, the discharge capacity retention of 701 mAh g-1 (3.5 mAh cm-2) can be endowed for the S/3DOM TiN electrode under high sulfur loading of 5 mg cm-2 after 100 cycles at 0.1 C. Therefore, the 3DOM TiN nanostructure electrocatalyst provides a promising path for developing practically useable Li-S batteries.

scholarly journals Nickel sulfide nanocrystals on nitrogen-doped porous carbon nanotubes with high-efficiency electrocatalysis for room-temperature sodium-sulfur batteries

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Zichao Yan ◽  
Jin Xiao ◽  
Weihong Lai ◽  
Li Wang ◽  
Florian Gebert ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Porous Carbon ◽  
Density Functional ◽  
Room Temperature ◽  
Lewis Base ◽  
Nitrogen Doped ◽  
High Electronic Conductivity ◽  
Sulfur Host ◽  
Sodium Sulfur ◽  
Sulfur Cathodes

Abstract Polysulfide dissolution and slow electrochemical kinetics of conversion reactions lead to low utilization of sulfur cathodes that inhibits further development of room-temperature sodium-sulfur batteries. Here we report a multifunctional sulfur host, NiS2 nanocrystals implanted in nitrogen-doped porous carbon nanotubes, which is rationally designed to achieve high polysulfide immobilization and conversion. Attributable to the synergetic effect of physical confinement and chemical bonding, the high electronic conductivity of the matrix, closed porous structure, and polarized additives of the multifunctional sulfur host effectively immobilize polysulfides. Significantly, the electrocatalytic behaviors of the Lewis base matrix and the NiS2 component are clearly evidenced by operando synchrotron X-ray diffraction and density functional theory with strong adsorption of polysulfides and high conversion of soluble polysulfides into insoluble Na2S2/Na2S. Thus, the as-obtained sulfur cathodes exhibit excellent performance in room-temperature Na/S batteries.

scholarly journals Encapsulating Metal-Organic-Foam Derived Nanocages into a Microcapsule for Shuttle Effect-Suppressive Lithium-Sulfur Batteries

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 236
Author(s):  
Jinyun Liu ◽  
Yajun Zhu ◽  
Junfei Cai ◽  
Yan Zhong ◽  
Tianli Han ◽  
...  
Keyword(s):  
Density Functional ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Density Functional Theory Calculations ◽  
Binding Energies ◽  
High Rate ◽  
Lithium Storage ◽  
Shuttle Effect ◽  
Metal Organic ◽  
High And Low Temperatures

Long-term stable secondary batteries are highly required. Here, we report a unique microcapsule encapsulated with metal organic foams (MOFs)-derived Co3O4 nanocages for a Li-S battery, which displays good lithium-storage properties. ZIF-67 dodecahedra are prepared at room temperature then converted to porous Co3O4 nanocages, which are infilled into microcapsules through a microfluidic technique. After loading sulfur, the Co3O4/S-infilled microcapsules are obtained, which display a specific capacity of 935 mAh g−1 after 200 cycles at 0.5C in Li-S batteries. A Coulombic efficiency of about 100% is achieved. The constructed Li-S battery possesses a high rate-performance during three rounds of cycling. Moreover, stable performance is verified under both high and low temperatures of 50 °C and −10 °C. Density functional theory calculations show that the Co3O4 dodecahedra display large binding energies with polysulfides, which are able to suppress shuttle effect of polysulfides and enable a stable electrochemical performance.

scholarly journals Electrocatalytic Assisted Performance Enhancement for the Na-S Battery in Nitrogen-Doped Carbon Nanospheres Loaded with Fe

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1585 ◽  
Author(s):  
Jianhui Zhu ◽  
Amr Abdelkader ◽  
Denisa Demko ◽  
Libo Deng ◽  
Peixin Zhang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Carbon Nanostructures ◽  
Room Temperature ◽  
Performance Enhancement ◽  
Energy Storage And Conversion ◽  
Carbon Nanospheres ◽  
Shuttle Effect ◽  
Electrocatalytic Effect ◽  
Sodium Sulfur ◽  
Fe Ions

Room temperature sodium-sulfur batteries have been considered to be potential candidates for future energy storage devices because of their low cost, abundance, and high performance. The sluggish sulfur reaction and the “shuttle effect” are among the main problems that hinder the commercial utilization of room temperature sodium-sulfur batteries. In this study, the performance of a hybrid that was based on nitrogen (N)-doped carbon nanospheres loaded with a meagre amount of Fe ions (0.14 at.%) was investigated in the sodium-sulfur battery. The Fe ions accelerated the conversion of polysulfides and provided a stronger interaction with soluble polysulfides. The Fe-carbon nanospheres hybrid delivered a reversible capacity of 359 mAh·g−1 at a current density of 0.1 A·g−1 and retained a capacity of 180 mAh·g−1 at 1 A·g−1, after 200 cycles. These results, combined with the excellent rate performance, suggest that Fe ions, even at low loading, are able to improve the electrocatalytic effect of carbon nanostructures significantly. In addition to Na-S batteries, the new hybrid is anticipated to be a strong candidate for other energy storage and conversion applications such as other metal-sulfur batteries and metal-air batteries.

Stable sodium-sulfur electrochemistry enabled by phosphorus-based complexation

2021 ◽  
Vol 118 (49) ◽  
pp. e2116184118
Author(s):  
Chuanlong Wang ◽  
Yue Zhang ◽  
Yiwen Zhang ◽  
Jianmin Luo ◽  
Xiaofei Hu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Density Functional ◽  
Room Temperature ◽  
Solid Phase ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Wide Range ◽  
Sulfur Battery ◽  
Sodium Sulfur Battery ◽  
Sodium Sulfur

A series of sodium phosphorothioate complexes are shown to have electrochemical properties attractive for sodium-sulfur battery applications across a wide operating temperature range. As cathode materials, they resolve a long-standing issue of cyclic liquid–solid phase transition that causes sluggish reaction kinetics and poor cycling stability in conventional, room-temperature sodium-sulfur batteries. The cathode chemistry yields 80% cyclic retention after 400 cycles at room temperature and a superior low-temperature performance down to −60 °C. Coupled experimental characterization and density functional theory calculations revealed the complex structures and electrochemical reaction mechanisms. The desirable electrochemical properties are attributed to the ability of the complexes to prevent the formation of solid precipitates over a fairly wide range of voltage.

scholarly journals Improved Electrochemical Investigation of Combustion Synthesized Cd-doped LiCoO2 Powders

2010 ◽  
Vol 2 (3) ◽  
pp. 443 ◽  
Author(s):  
S. Valanarasu ◽  
R. Chandramohan ◽  
J. Thirumalai ◽  
T. A. Vijayan
Keyword(s):  
Surface Morphology ◽  
Discharge Capacity ◽  
Room Temperature ◽  
Combustion Method ◽  
Cycling Performance ◽  
Structural Studies ◽  
Ftir Studies ◽  
Electrical Conductivities ◽  
Synthesized Materials ◽  
Ligand Bond

The LiCo1-xCdxO2 (x = 0 to 0.1) cathode materials were synthesized by the combustion method (annealed at 800 °C for 12 h). Structural analyses of the synthesized materials were carried out using XRD. All the samples had the R-3m structure. LiCo0.90Cd0.1O2 sample contained CdO phase as an impurity. Fourier transform infrared (FTIR) studies were carried out to understand the nature of the metal-ligand bond. The surface morphology and particle agglomeration was investigated using scanning electron microscope. The room temperature electrical conductivities of the sample increased with Cd content. For LiCo1-xCdxO2 (x = 0, 0.01, 0.03, 0.05 and 0.1), the first discharge capacity increased with increase in Cd content. Among these samples, LiCo0.95Cd0.05O2 had good cycling performance (discharge capacity 195 mAh g-1 at n = 30).  Keywords: LiCo1-xCdxO2; Structural studies; Surface morphology; Conductivity; Discharge capacity. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i3.3877                 J. Sci. Res. 2 (3), 443-452 (2010) 

scholarly journals Template-Free Electrochemical Preparation of Hexagonal CuSn Prism-Structural Electrode for Lithium-Ion Batteries

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Xiaona Pan ◽  
Haiyan Zhang ◽  
Xiaoyu Wen ◽  
Jinqiu Zhang ◽  
Maozhong An ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Room Temperature ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Hexagonal Prism ◽  
Electrochemical Preparation ◽  
Electrodeposition Time ◽  
Template Free ◽  
First Discharge Capacity

A hexagonal prism CuSn alloy was prepared at room temperature from 1-ethyl-3-methylimidazolium dicyanamide ([Emim][DCA]) by the direct template-free electrodeposition method with different concentrations of Cu(I) and Sn(II) at a low current density of 0.04 A dm−2. Moreover, the electrodeposition time was also investigated, and the results indicated that the composition of the CuSn alloy became complex and the structure turned unstable with expanding time. The cycling performance of the hexagonal prism-structural CuSn electrode was investigated, with the first discharge capacity of 345 mAh g−1 and a discharge capacity of about 210 mAh g−1 after 10 cycles.

A shuttle effect free lithium sulfur battery based on a hybrid electrolyte

2014 ◽  
Vol 16 (39) ◽  
pp. 21225-21229 ◽  
Author(s):  
Qingsong Wang ◽  
Jun Jin ◽  
Xiangwei Wu ◽  
Guoqiang Ma ◽  
Jianhua Yang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Coulombic Efficiency ◽  
Lithium Sulfur Battery ◽  
Shuttle Effect ◽  
Sulfur Battery ◽  
Lithium Sulfur

A room temperature hybrid electrolyte based lithium–sulfur cell was successfully cycled with an excellent coulombic efficiency of 100%.

Sulfur-Biological Carbon for Long-Life Room-Temperature Sodium-Sulfur Battery

2020 ◽  
Vol 14 (4) ◽  
pp. 487-491
Author(s):  
Xiang Xiao ◽  
Wei Li ◽  
Jianbing Jiang
Keyword(s):  
Volume Expansion ◽  
Large Scale ◽  
Room Temperature ◽  
Low Cost ◽  
Shuttle Effect ◽  
Practical Applications ◽  
Co Doping ◽  
Sulfur Battery ◽  
Sodium Sulfur Battery ◽  
Sodium Sulfur

Room-temperature sodium-sulfur (RT-Na/S) batteries are gaining much attention particularly in large-scale energy storage due to high theoretical energy density and low cost. However, low conductivity and volume expansion of sulfur, as well as severe shuttle effect of soluble sodium polysulfides largely hamper their practical applications. Herein, we report an architecture of sulfur embedded in biological carbon (SBC) as cathode for RT-Na/S batteries. The SBC with N, P co-doping biological carbon and hierarchically porous structure afford fast electron and ion transportation, as well as good mechanical limitation of volume expansion and shuttle effect, therefore achieving excellent cyclic stability (544.7 mAh · g–1 at current density of 200 mA · g –1 after 984 cycles).

Sign in / Sign up

Export Citation Format

Share Document