Co–Fe Mixed Metal Phosphide Nanocubes with Highly Interconnected-Pore Architecture as an Efficient Polysulfide Mediator for Lithium–Sulfur Batteries

ACS Nano ◽  
2019 ◽  
Vol 13 (4) ◽  
pp. 4731-4741 ◽  
Author(s):  
Yi Chen ◽  
Wenxue Zhang ◽  
Dong Zhou ◽  
Huajun Tian ◽  
Dawei Su ◽  
...  
Keyword(s):  
Metal Phosphide ◽  
Mixed Metal ◽  
Pore Architecture ◽  
Lithium Sulfur Batteries ◽  
Interconnected Pore ◽  
Lithium Sulfur

Mechanistic Understanding of Metal Phosphide Host for Sulfur Cathode in High-Energy-Density Lithium–Sulfur Batteries

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 8986-8996 ◽  
Author(s):  
Jiadong Shen ◽  
Xijun Xu ◽  
Jun Liu ◽  
Zhengbo Liu ◽  
Fangkun Li ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Sulfur Cathode ◽  
Metal Phosphide ◽  
Lithium Sulfur Batteries ◽  
Mechanistic Understanding ◽  
Lithium Sulfur

Porous Ti4O7Particles with Interconnected-Pore Structure as a High-Efficiency Polysulfide Mediator for Lithium-Sulfur Batteries

2017 ◽  
Vol 27 (26) ◽  
pp. 1701176 ◽  
Author(s):  
Shilin Mei ◽  
Charl J. Jafta ◽  
Iver Lauermann ◽  
Qidi Ran ◽  
Martin Kärgell ◽  
...  
Keyword(s):  
Pore Structure ◽  
High Efficiency ◽  
Lithium Sulfur Batteries ◽  
Interconnected Pore ◽  
Interconnected Pore Structure ◽  
Lithium Sulfur

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>

Separator modified by Ketjen black for enhanced electrochemical performance of lithium–sulfur batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 13680-13685 ◽  
Author(s):  
Di Zhao ◽  
Xinye Qian ◽  
Lina Jin ◽  
Xiaolong Yang ◽  
Shanwen Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Side ◽  
Electrochemical Performances ◽  
Lithium Sulfur Batteries ◽  
Enhanced Electrochemical Performance ◽  
Lithium Sulfur

A routine separator modified by a Ketjen black (KB) layer on the cathode side has been investigated to improve the electrochemical performances of Li–S batteries.

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