Atomically dispersed Fe in a C2N based catalyst as a sulfur host for efficient lithium-sulfur batteries

Lithium-sulfur batteries (LSBs) are considered to be one of the most promising next generation energy storage systems due to their high energy density and low material cost. However, there are still some challenges for the commercialization of LSBs, such as the sluggish redox reaction kinetics and t...

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Detalles Bibliográficos
Autores: Liang, Zhifu, Yang, Dawei|||0000-0002-3842-8286, Tang, PengYi|||0000-0002-2306-095X, Zhang, Chaoqi|||0000-0002-0357-235X, Jacas Biendicho, Jordi|||0000-0001-5981-6168, Zhang, Yi, Llorca, Jordi|||0000-0002-7447-9582, Wang, Xiang, Li, Junshan|||0000-0002-1482-1972, Heggen, Marc|||0000-0002-2646-0078, David, Jérémy|||0000-0003-3219-149X, Dunin-Borkowski, Rafal E.|||0000-0001-8082-0647, Zhou, Yingtang|||0000-0002-8678-295X, Morante, Joan Ramon|||0000-0002-4981-4633, Cabot i Codina, Andreu|||0000-0002-7533-3251, Arbiol i Cobos, Jordi|||0000-0002-0695-1726
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:271942
Acceso en línea:https://ddd.uab.cat/record/271942
https://dx.doi.org/urn:doi:10.1002/aenm.202003507
Access Level:acceso abierto
Palabra clave:Atomically dispersed iron
Electrocatalytic polysulfide conversion
Lithium-sulfur batteries
Organic layered materials
Descripción
Sumario:Lithium-sulfur batteries (LSBs) are considered to be one of the most promising next generation energy storage systems due to their high energy density and low material cost. However, there are still some challenges for the commercialization of LSBs, such as the sluggish redox reaction kinetics and the shuttle effect of lithium polysulfides (LiPS). Here a 2D layered organic material, CN, loaded with atomically dispersed iron as an effective sulfur host in LSBs is reported. X-ray absorption fine spectroscopy and density functional theory calculations prove the structure of the atomically dispersed Fe/CN catalyst. As a result, Fe/CN-based cathodes demonstrate significantly improved rate performance and long-term cycling stability. Fe/CN-based cathodes display initial capacities up to 1540 mAh g at 0.1 C and 678.7 mAh g at 5 C, while retaining 496.5 mAh g after 2600 cycles at 3 C with a decay rate as low as 0.013% per cycle. Even at a high sulfur loading of 3 mg cm, they deliver remarkable specific capacity retention of 587 mAh g after 500 cycles at 1 C. This work provides a rational structural design strategy for the development of high-performance cathodes based on atomically dispersed catalysts for LSBs.

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