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Promoted Deposition of Three-Dimensional LiS on Catalytic Co Phthalocyanine Nanorods for Stable High-Loading Lithium-Sulfur Batteries. | LitMetric

Promoted Deposition of Three-Dimensional LiS on Catalytic Co Phthalocyanine Nanorods for Stable High-Loading Lithium-Sulfur Batteries.

ACS Appl Mater Interfaces

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, China.

Published: July 2020

AI Article Synopsis

Article Abstract

The sulfur redox in Li-S batteries involves a complex sequence of solid-liquid-solid conversions, and reaction catalysis has recently become a focused area for further advancement. The deposition of solid LiS from liquid LiS contributes to three-quarters of the total theoretical capacity and is therefore of great significance over the entire cathode reaction. This study demonstrates a cathode material composed of carbon nanofibers decorated with catalytic Co phthalocyanine nanorods (CoPc@CNF), which are highly effective in promoting the deposition of LiS in three-dimensional (3D) fine particles rather than 2D thin films. This significantly alleviates cathode passivation during cell charge and discharge, leading to obviously improved sulfur utilization and cycling stability for high loading cathodes. DFT calculations indicate that the promoted 3D deposition of LiS is related to the facilitated migration of deposition precursors (LiS and Li-ions) to migrate on the CoPc nanorods. Lithium-sulfur (Li-S) pouch cells were prepared with high specific (954 mAh g), areal (4.8 mAh cm), and total (235 mAh) capacities achieved at 0.5 C under high sulfur content. As metal phthalocyanines possess a high structural variability, this study provides opportunities to the design of a new class of Li-S cathode materials.

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Source
http://dx.doi.org/10.1021/acsami.0c08027DOI Listing

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