MOF-derived NiO–NiCo2O4@PPy hollow polyhedron as a sulfur immobilizer for lithium–sulfur batteries

2019 ◽  
Vol 43 (46) ◽  
pp. 18294-18303 ◽  
Author(s):  
Fengchao Xu ◽  
Bo Jin ◽  
Huan Li ◽  
Wentao Ju ◽  
Zi Wen ◽  
...  
Keyword(s):  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Cell Performance ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Initial Coulombic Efficiency ◽  
Lithium Sulfur

A MOF-derived NiO–NiCo2O4@PPy hollow polyhedron is prepared as a sulfur host to effectively enhance cell performance. S/NiO–NiCo2O4@PPy displays a high initial discharge capacity of 963 mA h g−1 with a high initial coulombic efficiency of 95.2% at 0.2C.

Fabrication of layered Ti3C2 with an accordion-like structure as a potential cathode material for high performance lithium–sulfur batteries

2015 ◽  
Vol 3 (15) ◽  
pp. 7870-7876 ◽  
Author(s):  
Xiaoqin Zhao ◽  
Min Liu ◽  
Yong Chen ◽  
Bo Hou ◽  
Na Zhang ◽  
...  
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Initial Discharge ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

L-Ti3C2 was prepared by exfoliating Ti3AlC2 in 40% HF. With sulfur-loaded L-Ti3C2 as cathodes, Li–S batteries deliver a high initial discharge capacity of 1291 mA h g−1, an excellent capacity retention of 970 mA h g−1 and coulombic efficiency of 99% after 100 cycles.

Hydrothermal synthesis of porous TiO2 microspheres as an efficient sulfur host for enhanced lithium–sulfur batteries

2020 ◽  
Vol 10 (10) ◽  
pp. 1692-1696
Author(s):  
Haishen Song ◽  
Qiujuan Kuang ◽  
Hailiang Yuan ◽  
Hezhang Chen ◽  
Guorong Xu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Coulombic Efficiency ◽  
Chemical Adsorption ◽  
Capacity Loss ◽  
Effective Contact ◽  
Excellent Electrochemical Performance ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Tio2 Microspheres ◽  
Lithium Sulfur

A porous TiO2 particle is synthesized and used as a sulfur host. The obtained TiO2 material provides a large number of pores that can accommodate sulfur, and the porous structure also enables effective contact between the host material and lithium polysulfides. The TiO2/S electrode shows excellent electrochemical performance, exhibiting a capacity loss of 0.17% per cycle and a Coulombic efficiency of 97.7% during cycling at 0.5 C. The appealing results are due to the porous characteristics of the TiO2 material and the chemical adsorption between the TiO2 and lithium polysulfides.

Sulfur/Co3O4 nanotube composite with high performances as cathode materials for lithium sulfur batteries

2014 ◽  
Vol 07 (03) ◽  
pp. 1450020 ◽  
Author(s):  
Hong Cheng ◽  
Shengping Wang ◽  
Du Tao ◽  
Man Wang
Keyword(s):  
Electron Microscopy ◽  
Initial Discharge Capacity ◽  
Sulfur Cathode ◽  
X Ray ◽  
Capacity Reservation ◽  
Initial Discharge ◽  
Transmission Electron ◽  
Bet Analysis ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

To improve the overall electrochemical performance of the sulfur cathode in Li / S batteries, a hollow Co 3 O 4 nanotube with a channel measuring approximately 12.5 nm in diameter is synthesized and then impregnated with sulfur via a melt-diffusion strategy. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) analysis and thermogravimetric analysis indicate that sulfur impregnated the channels of the hollow Co 3 O 4 nanotube. Because the sulfur is mostly restricted to the Co 3 O 4 nanotubes, a sulfur/ Co 3 O 4 cathode with 10 wt.% sulfur loading delivers an initial discharge capacity of 963.4 mAh g-1, with much of the capacity contributed by Co 3 O 4, and exhibits excellent reversibility with a capacity reservation of 80.8% after 100 cycles.

scholarly journals Effect of Polyaniline on Sulfur/Sepiolite Composite Cathode for Lithium-Sulfur Batteries

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 755
Author(s):  
Kalaiselvi Chelladurai ◽  
Priyanka Venkatachalam ◽  
Subadevi Rengapillai ◽  
Wei-Ren Liu ◽  
Chia-Hung Huang ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Conductive Polymer ◽  
Composite Cathode ◽  
Active Mass ◽  
Pinning Effect ◽  
Initial Discharge ◽  
Pani Composite ◽  
Lithium Sulfur Batteries ◽  
Stable Network ◽  
Lithium Sulfur

Composite materials with a stable network structure consisting of natural sepiolite (Sp) powders (both sieved sepiolite and post-treated sepiolite), sulfur(S), and conductive polymer Polyaniline (PAni) have been successfully synthesized using a simple heat treatment. The morphology of composites illustrates that the sepiolite is composed of many needle-like fibrous clusters. The initial discharge capacity of the post-treated sepiolite/sulfur/PAni composite is about 1230 mA h g−1 at 0.1 C, and it remains at 826 mA h g−1 even after 40 cycles with the corresponding coulombic efficiency above 97%. Such performance is attributed to the specific porous structure, outstanding adsorption characteristics, and excellent ion exchange capability of sepiolite, as well as the excellent conductivity of PAni. In addition, the PAni coating has a pinning effect on sulfur, which influences the consumption of the active mass and enhances the cycling constancy and the coulombic efficiency of the composite material at elevated current rates.

scholarly journals Carbon Loaded Nano-Designed Spherically High Symmetric Lithium Iron Orthosilicate Cathode Materials for Lithium Secondary Batteries

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1703 ◽  
Author(s):  
Diwakar Karuppiah ◽  
Rajkumar Palanisamy ◽  
Subadevi Rengapillai ◽  
Wei-Ren Liu ◽  
Chia-Hung Huang ◽  
...  
Keyword(s):  
Particle Size ◽  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Rate Performance ◽  
Initial Discharge Capacity ◽  
Lithium Secondary Batteries ◽  
Initial Discharge ◽  
The Difference ◽  
Modified Polyol Method ◽  
Lithium Iron Orthosilicate

In the present study, Li2FeSiO4 (LFS) cathode material has been prepared via a modified polyol method. The stabilizing nature of polyol solvent was greatly influenced to reduce the particle size (~50 nm) and for coating the carbon on the surface of the as-mentioned materials (~10 nm). As-prepared nano-sized Li2FeSiO4 material deliver initial discharge capacity of 186 mAh·g−1 at 1C with the coulombic efficiency of 99% and sustain up to 100 cycles with only 7 mAh·g−1 is the difference of discharge capacity from its 1st cycle to 100th cycle. The rate performance illustrates the discharge capacity 280 mAh·g−1 for lower C-rate (C/20) and 95 mAh·g−1 for higher C-rate (2C).

scholarly journals Graphene/Sulfur@Graphene Composite Structure Material for a Lithium-Sulfur Battery Cathode

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Zengren Tao ◽  
Jianrong Xiao ◽  
Zhiyun Yang ◽  
Heng Wang
Keyword(s):  
Discharge Capacity ◽  
Composite Structure ◽  
Coulombic Efficiency ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Graphene Composite ◽  
Initial Discharge ◽  
Fading Rate ◽  
Sulfur Battery ◽  
Lithium Sulfur

Graphene/sulfur@graphene composite structure as a cathode material is synthesized with a facile method. Graphene can provide a more efficient conductive network for sulfur and improve the coulombic efficiency of the battery. On the other hand, it may also show the anchoring effect on sulfur, which reduces the loss of sulfur and improves the cycling performance of the battery. Due to the unique structure, the initial discharge capacity of a battery assembled with this structure could reach 1036 mAh g−1 at 0.1 C, and its reversible capacity of 619 mAh g−1 was retained after 200 cycles with a low fading rate of 0.2% per cycle. The battery could hold a discharge capacity of 501 mAh g−1 after 200 cycles at 0.5 C. Thus, the electrochemical performance improved because of the reduction of sulfur loss through polysulfide accumulation at the cathode.

scholarly journals Low cost bio-derived carbon-sprinkled manganese dioxide as an efficient sulfur host for lithium–sulfur batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24261-24267 ◽  
Author(s):  
Aswathy Raghunandanan ◽  
Ulaganathan Mani ◽  
Ragupathy Pitchai
Keyword(s):  
Carbon Source ◽  
Manganese Dioxide ◽  
Low Cost ◽  
Carbon Composite ◽  
Cell Performance ◽  
Hemp Fibre ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Lithium Sulfur

MnO2-biomass (hemp) derived carbon composite is used as an effective cathode in Li–S cell. MnO2 acted as polysulfide scuffolding in the composite enhancing Li–S cell performance. New carbon source (hemp-fibre) was utilised successfully in Li–S.

Cellulose Separators with Integrated Carbon Nanotube Interlayers for Lithium-Sulfur Batteries: An Investigation into the Complex Interplay Between Cell Components

2019 ◽  
Author(s):  
Yu-Chuan Chien ◽  
Ruijun Pan ◽  
Ming-Tao Lee ◽  
Leif Nyholm ◽  
Daniel Brandell ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Solid Electrolyte Interphase ◽  
Holistic Approach ◽  
Cycle Life ◽  
Complex Interplay ◽  
Positive Electrodes ◽  
Lithium Sulfur Batteries ◽  
Cell Components ◽  
Redox Shuttle ◽  
Lithium Sulfur

This work aims to address two major roadblocks in the development of lithium-sulfur (Li-S) batteries: the inefficient deposition of Li on the metallic Li electrode and the parasitic "polysulfide redox shuttle". These roadblocks are here approached, respectively, by the combination of a cellulose separator with a cathode-facing conductive porous carbon interlayer, based on their previously reported individual benefits. The cellulose separator increases cycle life by 33%, and the interlayer by a further 25%, in test cells with positive electrodes with practically relevant specifications and a relatively low electrolyte/sulfur (E/S) ratio. Despite the prolonged cycle life, the combination of the interlayer and cellulose separator increases the polysulfide shuttle current, leading to reduced Coulombic efficiency. Based on XPS analyses, the latter is ascribed to a change in the composition of the solid electrolyte interphase (SEI) on Li. Meanwhile, electrolyte decomposition is found to be slower in cells with cellulose-based separators, which explains their longer cycle life. These counterintuitive observations demonstrate the complicated interactions between the cell components in the Li-S system and how strategies aiming to mitigate one unwanted process may exacerbate another. This study demonstrates the value of a holistic approach to the development of Li-S chemistry.<br>

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