Cationic polymer binder inhibit shuttle effects through electrostatic confinement in lithium sulfur batteries

2018 ◽  
Vol 6 (16) ◽  
pp. 6959-6966 ◽  
Author(s):  
Huali Wang ◽  
Min Ling ◽  
Ying Bai ◽  
Shi Chen ◽  
Yanxia Yuan ◽  
...  
Keyword(s):  
Chemical Reactions ◽  
Cationic Polymer ◽  
Polymer Binder ◽  
Cycle Life ◽  
Capacity Fading ◽  
Electrostatic Confinement ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

Irreversible chemical reactions frequently cause capacity fading and poor cycle life in lithium–sulfur (Li–S) batteries due to the formation of irreversible lithium polysulfides.

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>

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,...

scholarly journals Fabrication of a Covalent Triazine Framework Functional Interlayer for High-Performance Lithium–Sulfur Batteries

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 255
Author(s):  
Ben Hu ◽  
Bing Ding ◽  
Chong Xu ◽  
Zengjie Fan ◽  
Derong Luo ◽  
...  
Keyword(s):  
Electronic Transport ◽  
High Performance ◽  
Capacity Fading ◽  
Transport Pathway ◽  
One Dimensional ◽  
Strong Adsorption ◽  
Lithium Sulfur Batteries ◽  
Covalent Triazine Framework ◽  
Adsorption Capability ◽  
Lithium Sulfur

The shuttling effect of polysulfides is one of the major problems of lithium–sulfur (Li–S) batteries, which causes rapid capacity fading during cycling. Modification of the commercial separator with a functional interlayer is an effective strategy to address this issue. Herein, we modified the commercial Celgard separator of Li–S batteries with one-dimensional (1D) covalent triazine framework (CTF) and a carbon nanotube (CNT) composite as a functional interlayer. The intertwined CTF/CNT can provide a fast lithium ionic/electronic transport pathway and strong adsorption capability towards polysulfides. The Li–S batteries with the CTF/CNT/Celgard separator delivered a high initial capacity of 1314 mAh g−1 at 0.1 C and remained at 684 mAh g−1 after 400 cycles−1 at 1 C. Theoretical calculation and static-adsorption experiments indicated that the triazine ring in the CTF skeleton possessed strong adsorption capability towards polysulfides. The work described here demonstrates the potential for CTF-based permselective membranes as separators in Li–S batteries.

High-Rate, Ultralong Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene

Nano Letters ◽  
2014 ◽  
Vol 14 (8) ◽  
pp. 4821-4827 ◽  
Author(s):  
Yongcai Qiu ◽  
Wanfei Li ◽  
Wen Zhao ◽  
Guizhu Li ◽  
Yuan Hou ◽  
...  
Keyword(s):  
Cycle Life ◽  
High Rate ◽  
Nitrogen Doped ◽  
Lithium Sulfur Batteries ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Lithium Sulfur

Preparation of a graphitic N-doped multi-walled carbon nanotube composite for lithium–sulfur batteries with long-life and high specific capacity

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 76568-76574 ◽  
Author(s):  
Chunli Wang ◽  
Feifei Zhang ◽  
Xuxu Wang ◽  
Gang Huang ◽  
Dongxia Yuan ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Specific Capacity ◽  
Capacity Fading ◽  
High Specific Capacity ◽  
Multi Walled Carbon Nanotube ◽  
Lithium Sulfur Batteries ◽  
Long Life ◽  
Carbon Nanotube Composite ◽  
Lithium Sulfur

One of the challenges for lithium–sulfur batteries is a rapid capacity fading owing to the insulating of sulfur and Li2S2/Li2S compounds, the dissolving and consequent shuttling of polysulfide.

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