Core-shell structured S@CuO/δ-MnO2 composites as cathodes for lithium-sulfur batteries

CrystEngComm ◽  
2021 ◽  
Author(s):  
Guiying Xu ◽  
Yongying Li ◽  
Hui Cheng ◽  
Guan Liu ◽  
Ziyang Yang ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Cycle Life ◽  
Core Shell ◽  
Practical Application ◽  
Short Cycle ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur ◽  
Capacity Decay

The dissolution of polysulfides (LiPSs) always leads to low Coulombic efficiency, dramatic capacity decay, and short cycle life, which hinders the practical application of lithium-sulfur (Li-S) batteries. In this study,...

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>

A Well-Designed Polymer as a Three-in-One Multifunctional Binder for High-Performance Lithium-Sulfur Battery

2020 ◽  
Author(s):  
Jia-Jia Yuan ◽  
Qingran Kong ◽  
Zheng Huang ◽  
You-Zhi Song ◽  
Mingyang Li ◽  
...  
Keyword(s):  
High Performance ◽  
Cycle Life ◽  
Commercial Application ◽  
Lithium Sulfur Battery ◽  
Shuttle Effect ◽  
Lithium Sulfur Batteries ◽  
Cathode Structure ◽  
Sulfur Battery ◽  
Lithium Sulfur ◽  
Capacity Decay

The commercial application of lithium-sulfur batteries is mainly restricted by quick capacity decay and poor cycle life due to the shuttle effect, insulate nature of sulfur, and cathode structure pulverization....

Progress on Continuum Modeling of Lithium Sulfur Batteries

2021 ◽  
Author(s):  
Caitlin D. Parke ◽  
Linnette Teo ◽  
Daniel T Schwartz ◽  
Venkat R. Subramanian
Keyword(s):  
Energy Density ◽  
Coulombic Efficiency ◽  
Cycle Life ◽  
Next Generation ◽  
Continuum Modeling ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

While lithium sulfur batteries are a promising next-generation chemistry due to their high theoretical energy density, commercialization has been slow due to low coulombic efficiency and poor cycle life. This...

scholarly journals MnO2-Coated Dual Core–Shell Spindle-Like Nanorods for Improved Capacity Retention of Lithium–Sulfur Batteries

2020 ◽  
Vol 4 (2) ◽  
pp. 42 ◽  
Author(s):  
Hamza Dunya ◽  
Maziar Ashuri ◽  
Dana Alramahi ◽  
Zheng Yue ◽  
Kamil Kucuk ◽  
...  
Keyword(s):  
High Performance ◽  
Synergistic Effects ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Core Shell ◽  
Shuttle Effect ◽  
Lithium Sulfur Batteries ◽  
Hollow Carbon ◽  
Dual Core ◽  
Lithium Sulfur

The emerging need for high-performance lithium–sulfur batteries has motivated many researchers to investigate different designs. However, the polysulfide shuttle effect, which is the result of dissolution of many intermediate polysulfides in electrolyte, has still remained unsolved. In this study, we have designed a sulfur-filled dual core–shell spindle-like nanorod structure coated with manganese oxide (S@HCNR@MnO2) to achieve a high-performance cathode for lithium–sulfur batteries. The cathode showed an initial discharge capacity of 1661 mA h g−1 with 80% retention of capacity over 70 cycles at a 0.2C rate. Furthermore, compared with the nanorods without any coating (S@HCNR), the MnO2-coated material displayed superior rate capability, cycling stability, and Coulombic efficiency. The synergistic effects of the nitrogen-doped hollow carbon host and the MnO2 second shell are responsible for the improved electrochemical performance of this nanostructure.

scholarly journals Polysulfide Electrocatalysis on Framework Porphyrin in High-Capacity and High-Stable Lithium–Sulfur Batteries

CCS Chemistry ◽  
2019 ◽  
pp. 128-137 ◽  
Author(s):  
Bo-Quan Li ◽  
Hong-Jie Peng ◽  
Xiang Chen ◽  
Shu-Yuan Zhang ◽  
Jin Xie ◽  
...  
Keyword(s):  
Redox Reactions ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Energy Storage Devices ◽  
Sulfur Species ◽  
Storage Devices ◽  
Lithium Sulfur Batteries ◽  
Energy Conversion And Storage ◽  
Lithium Sulfur ◽  
Capacity Decay

Lithium–sulfur batteries with an ultrahigh theoretical energy density of 2600 Wh kg −1 are highly considered as desirable next-generation energy storage devices that will meet the growing demand of energy consumption worldwide. However, complicated sulfur redox reactions and polysulfide shuttling significantly postpone the applications of lithium–sulfur batteries with rapid capacity decay and low Coulombic efficiency. Herein, a unique strategy of polysulfide electrocatalysis is proposed to improve the kinetics of the sulfur species and inhibit polysulfide shuttling in working lithium–sulfur batteries. Inspired by a natural biocatalyst and congener oxygen electrocatalysis, porphyrin was selected as the electrocatalytic active site, and framework porphyrin (POF) electrocatalysts were rationally designed, precisely fabricated, and demonstrated superior full-scheme electrocatalytic performance with regard to improving the kinetics for polysulfide conversion, Li 2S nucleation, and dissolution of Li 2S to polysulfides, simultaneously. Consequently, the lithium–sulfur batteries with POF electrocatalysts achieve high capacity of 1611 mAh·g −1 at 0.1 C; outstanding stability with the capacity decay rate of 0.071% in 400 cycles, and satisfied performance with a high sulfur loading up to 4.3 mg·cm −2. The strategy of polysulfide electrocatalysis develops our chemical understanding of sulfur species in energy-related applications and inspires the electrocatalysis concept for extended energy conversion and storage systems based on multielectron redox reactions.

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>

A gel-ceramic multi-layer electrolyte for long-life lithium sulfur batteries

2016 ◽  
Vol 52 (8) ◽  
pp. 1637-1640 ◽  
Author(s):  
Qingsong Wang ◽  
Zhaoyin Wen ◽  
Jun Jin ◽  
Jing Guo ◽  
Xiao Huang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Coulombic Efficiency ◽  
Cycle Life ◽  
Long Cycle ◽  
Long Cycle Life ◽  
Lithium Sulfur Batteries ◽  
Long Life ◽  
Lithium Sulfur

A gel-ceramic multi-layer Li–S cell exhibits superior electrochemical performance with almost no self-discharge, excellent coulombic efficiency and long cycle life.

scholarly journals Confine sulfur in double-hollow carbon sphere integrated with carbon nanotubes for advanced lithium–sulfur batteries

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Maru Dessie Walle ◽  
You-Nian Liu
Keyword(s):  
Carbon Nanotubes ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Sphere ◽  
Hollow Carbon Sphere ◽  
Lithium Sulfur Batteries ◽  
Hollow Carbon ◽  
Lithium Sulfur

AbstractThe lithium–sulfur (Li–S) batteries are promising because of the high energy density, low cost, and natural abundance of sulfur material. Li–S batteries have suffered from severe capacity fading and poor cyclability, resulting in low sulfur utilization. Herein, S-DHCS/CNTs are synthesized by integration of a double-hollow carbon sphere (DHCS) with carbon nanotubes (CNTs), and the addition of sulfur in DHCS by melt impregnations. The proposed S-DHCS/CNTs can effectively confine sulfur and physically suppress the diffusion of polysulfides within the double-hollow structures. CNTs act as a conductive agent. S-DHCS/CNTs maintain the volume variations and accommodate high sulfur content 73 wt%. The designed S-DHCS/CNTs electrode with high sulfur loading (3.3 mg cm−2) and high areal capacity (5.6 mAh mg cm−2) shows a high initial specific capacity of 1709 mAh g−1 and maintains a reversible capacity of 730 mAh g−1 after 48 cycles at 0.2 C with high coulombic efficiency (100%). This work offers a fascinating strategy to design carbon-based material for high-performance lithium–sulfur batteries.

Boosting Rate Performance of Li–S Batteries under High-Mass-Loading Sulfur based on Hierarchical NCNT@Co-CoP Nanowires Integrated Electrode

2021 ◽  
Author(s):  
Jianbo Li ◽  
Wenfu Xie ◽  
Shimeng Zhang ◽  
Simin Xu ◽  
Mingfei Shao
Keyword(s):  
Storage Systems ◽  
High Mass ◽  
Mass Loading ◽  
Rate Performance ◽  
Next Generation ◽  
Practical Application ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

Lithium−sulfur batteries (Li–S) has been gradual becoming one of the most promising next-generation storage systems, but its practical application is still limited by the extremely low S loading as well...

Sign in / Sign up

Export Citation Format

Share Document