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Simultaneously Encapsulating Co/Co 2 P Nanoparticles Inside and Growing Vertical Graphene Nanosheets Outside for N‐Doped Carbon Nanotubes as Efficient Sulfur Carriers for High‐Performance Lithium Sulfur Batteries

Agglomeration of carbon nanotubes (CNTs) extremely hampers utilization of active surface area and impedes sulfur loading, which limit their application in high–energy‐density lithium–sulfur (Li–S) batteries. Herein, N‐doped carbon nanotubes with Co/Co 2 P nanoparticles encapsulated inside and vertic...

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Bibliographic Details
Published in:Energy technology (Weinheim, Germany) Germany), 2023-09, Vol.11 (9)
Main Authors: Lin, Junsheng, Mo, Yangcheng, Li, Zhenwei, Yang, Kaochun, Yu, Jie
Format: Article
Language:English
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Summary:Agglomeration of carbon nanotubes (CNTs) extremely hampers utilization of active surface area and impedes sulfur loading, which limit their application in high–energy‐density lithium–sulfur (Li–S) batteries. Herein, N‐doped carbon nanotubes with Co/Co 2 P nanoparticles encapsulated inside and vertical graphene (VG) nanosheets grown outside (CCP@NCNT@VGs) are prepared as efficient sulfur carriers for Li–S batteries. The Co/Co 2 P nanoparticles encapsulated in the NCNTs could strongly anchor polysulfide and efficiently catalyze the conversion of polysulfides to Li 2 S, while the 3D hierarchical conductive network constructed by the vertical graphene nanosheets and NCNT quickly transfer electrons and improve the conversion kinetics of polysulfides. The as‐synthesized hierarchical structure combines conductivity with anchoring and catalysis, significantly elevating the electrochemical performance of the Li–S batteries. Hence, even at a high mass loading of 7 mg cm −2 , the CCP@NCNT@VGs/S electrode with limited electrolyte/sulfur ratio (4 μL mg −1 ) exhibits a high areal capacity of 7 mAh cm −2 , showing great application potential in the field of energy storage.
ISSN:2194-4288
2194-4296
DOI:10.1002/ente.202300283