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Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries

Lithium-sulfur (Li-S) batteries have nice prospects because of their excellent energy density and theoretical specific capacity. However, the dissolution of lithium polysulfides and shuttle effects lead to a low coulombic efficiency and cycle performance of Li-S batteries. Therefore, designing elect...

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Autores principales: Niu, Songqiao, Hu, Chenchen, Liu, Yanyu, Zhao, Yan, Yin, Fuxing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8400046/
https://www.ncbi.nlm.nih.gov/pubmed/34443741
http://dx.doi.org/10.3390/nano11081910
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author Niu, Songqiao
Hu, Chenchen
Liu, Yanyu
Zhao, Yan
Yin, Fuxing
author_facet Niu, Songqiao
Hu, Chenchen
Liu, Yanyu
Zhao, Yan
Yin, Fuxing
author_sort Niu, Songqiao
collection PubMed
description Lithium-sulfur (Li-S) batteries have nice prospects because of their excellent energy density and theoretical specific capacity. However, the dissolution of lithium polysulfides and shuttle effects lead to a low coulombic efficiency and cycle performance of Li-S batteries. Therefore, designing electrode materials that can suppress the shuttle effect and adsorb polysulfides is of great significance. In this work, a Co and N-codoped carbon composite via heating a type of Co-etched zeolitic imidazolate framework-67 (ZIF-67), nanocube precursor, in inert gas is reported as a cathode sulfur carrier material for Li-S batteries. The experimental results show that high-temperature carbonization results in mesoporous structures inside the material which not only provide ion channels for the reaction but also improve the adsorption capacity of polysulfides. Furthermore, the exposed metal Co sites and N atoms can also inhibit the shuttle effect. When the annealing temperature is 600 °C, the sulfur composite exhibits a good cycling stability and rate performance. The cathode showed an improved initial specific capability of 1042 and still maintained 477 mAh g(−1) at the rate of 1 C (1 C = 1672 mA g(−1)). Furthermore, at 5 C, a stable specific discharge capacity of 608 mAh g(−1) was obtained.
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spelling pubmed-84000462021-08-29 Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries Niu, Songqiao Hu, Chenchen Liu, Yanyu Zhao, Yan Yin, Fuxing Nanomaterials (Basel) Article Lithium-sulfur (Li-S) batteries have nice prospects because of their excellent energy density and theoretical specific capacity. However, the dissolution of lithium polysulfides and shuttle effects lead to a low coulombic efficiency and cycle performance of Li-S batteries. Therefore, designing electrode materials that can suppress the shuttle effect and adsorb polysulfides is of great significance. In this work, a Co and N-codoped carbon composite via heating a type of Co-etched zeolitic imidazolate framework-67 (ZIF-67), nanocube precursor, in inert gas is reported as a cathode sulfur carrier material for Li-S batteries. The experimental results show that high-temperature carbonization results in mesoporous structures inside the material which not only provide ion channels for the reaction but also improve the adsorption capacity of polysulfides. Furthermore, the exposed metal Co sites and N atoms can also inhibit the shuttle effect. When the annealing temperature is 600 °C, the sulfur composite exhibits a good cycling stability and rate performance. The cathode showed an improved initial specific capability of 1042 and still maintained 477 mAh g(−1) at the rate of 1 C (1 C = 1672 mA g(−1)). Furthermore, at 5 C, a stable specific discharge capacity of 608 mAh g(−1) was obtained. MDPI 2021-07-25 /pmc/articles/PMC8400046/ /pubmed/34443741 http://dx.doi.org/10.3390/nano11081910 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Niu, Songqiao
Hu, Chenchen
Liu, Yanyu
Zhao, Yan
Yin, Fuxing
Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries
title Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries
title_full Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries
title_fullStr Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries
title_full_unstemmed Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries
title_short Nanoporous Co and N-Codoped Carbon Composite Derived from ZIF-67 for High-Performance Lithium-Sulfur Batteries
title_sort nanoporous co and n-codoped carbon composite derived from zif-67 for high-performance lithium-sulfur batteries
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8400046/
https://www.ncbi.nlm.nih.gov/pubmed/34443741
http://dx.doi.org/10.3390/nano11081910
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